Online Systems. On-Guard. Box 2738, Blackfalds, AB T0M 0J0

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1 Signet is Windrock s authorized distributor for western Canada. As such we offer the full range of the Windrock product line. Here is a quick summary of the Windrock Online Products. Online Systems Online systems are permanently installed transducers and signal conditioning, which provide a continuous measurement and alarming of critical values and calculation of performance parameters and have been specifically designed for reciprocating engines and compressors. Windrock now offers two unique families of Online Systems to meet your varied application needs, OnGuard and Sentinel II. Both Systems are modular and configurable but designed for different applications. Signet Monitoring & Analysis will be pleased to assist in specifying which system best meets your application needs. On-Guard The On-Guard family of reciprocating engine and compressor online performance monitoring smart modules are a critical must for measuring mechanical condition and unit performance. Other parameters include horsepower, flow balance, temperature, ultrasonic, and vibration. Windrock, Inc. proudly introduces On-Guard, an online monitoring system for reciprocating engines and compressors. The On-Guard family offers the end user, OEM, or packager, the flexibility to design a monitoring system tailored specifically to your application, ranging from basic machine protection to full mechanical condition and performance monitoring. The system architecture is modular, consisting of six unique data-acquisition modules, referred to as "smart" modules because each module is multi-channeled with its own processor, memory, and multidrop address. The user can select the appropriate number and type of "smart" modules to meet the level of monitoring each application requires. All modules are connected via RS-485 (2 wire) cable or Ethernet to the user's PLC or DCS system running our On-Guard reciprocating machinery diagnostic software program. The unique design, based on Windrock's patented C-Guard module, makes installation simple, fast and inexpensive. All sensors and "smart" modules are designed to be mounted on the machine deck, thereby reducing the length of cable and conduit runs.

2 V-Guard II The V-Guard II is Windrock's eight channel vibration module. Each module accepts up to eight accelerometers and can be used as a stand-alone vibration monitoring system to monitor either reciprocating or centrifugal machinery or, when connected to Windrock's RS-485 com link, to add additional vibration capabilities to the C-Guard, HP-Guard, or E-Guard modules. As a stand-alone device, the V-Guard II can provide eight channels of vibration data to the user's PLC/DCS system via RS-485 com link. An optional relay is available for remote alarm indication. Key Features Utilizes Windrock s smart module for 8 channels per module of API 670 vibration monitoring Modular system architecture that can be configured to meet your monitoring requirements Installation is simple, fast and inexpensive Can be mounted on the machine deck to reduce the length of cable runs Two communications ports PLC/DCS via MODBUS Dynamic data to diagnostic software Optional On-Guard diagnostic software for monitoring, trending and reporting On-Guard software available in single user and multi-user network license versions V-Guard II The V-Guard II vibration module is Windrock s solution for vibration monitoring of reciprocating and centrifugal machinery. The eight (8) channel module, another member of Windrock s On-Guard family of smart modules, has its own processor, memory, and is capable of performing alarm detection and error checking. V-Guard II modular design allows for use as a stand-alone vibration monitoring device or as part of a comprehensive On-Guard system, monitoring both unit performance and mechanical condition. One of the truly unique features of the V-Guard II module is the ability to monitor true peak vibration and impacting in real time, continuously monitoring velocity (in/s peak), acceleration (g s peak) and bias voltage on each channel every 1 millisecond.

3 It compares upcoming inputs against programmable limits and communicates via RS-485 the values and alarm conditions back to user s PC. The V-Guard II has a built-in RS-485 MODBUS port so that your PLC can get the current vibration and impact values. A diagnostic workstation running On-Guard software provides a wide variety of reports and graphs, including machinery alarms, system alarms, multi-parameter trends, multi-parameter overlays, statistical histograms and X-Y correlations. On centrifugal machinery applications, having the capability to monitor both velocity and acceleration levels can be extremely useful. This allows the user to set up alarm levels for both running speed components in velocity (in/sec) and the higher order frequencies associated with blade passing, gear mesh, and/or rolling element bearing frequencies in acceleration (peak g s). Data Acquisition The V-Guard II board accepts inputs from up to eight (8) accelerometers plus one magnetic pickup for speed and phase reference. Each of the eight accelerometer input channels is monitored for both peak acceleration (0-peak, g s) and peak velocity (0-peak, in/sec). Individual alarm set points can be established for both excessive acceleration and velocity. This capability is particularly useful for both centrifugal machinery and reciprocating engines and compressors. Specifications Size: 8 inches high x 10 inches wide x 2 inches deep Weight: Less than 3 pounds Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Sensors rated for Class 1, Div I, Groups A, B, C, D areas. Built-in IS barriers so all sensor inputs may extend into a Class 1, Div I area Inputs: 8 accelerometer, 100 mv/g, ICP (constant current powered) Reset - resets danger relay if latching action is checked Danger Defeat - danger relay will not trip if this input is shorted Magnetic Pickup - standard variable reluctance passive magnetic pickup Outputs: PLC / DCS Interface - standard integer-based MODBUS RS-485, RTU Alarm Relay - Hermetically sealed, N.C. output logic Alert Relay - Hermetically sealed, N.C. output logic Not OK Relay - Hermetically sealed, N.C. output logic Power: 24 VDC, 250 ma, VDC Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

4 HP-Guard On-Guard module for reciprocating compressor-end monitoring The HP-Guard module was designed specifically to provide a cost effective, reliable approach to determine actual horsepower load, rod loading, and percent of rod reversal. This is especially important to users who want to "safely" maximize throughput on their reciprocating compressors. The HP-Guard module accepts up to twelve dynamic pressure sensors (6 double-acting cylinders) plus crank angle referenced speed/phase input signals. The internal processor calculates cylinder end IHP, total load, rod load, percentage of rod reversal, and cylinder end volumetric efficiencies. This calculated data, along with suction and discharge pressure and speed, is communicated to the user's PLC or DCS system via standard RS-485 com link. An optional relay is also available for remote alarm indication. Key Features Utilizes Windrock s patented smart module Monitors performance of up to 6 cylinders per module via pressure and temperature inputs Alarms on excessive rod load or lack of rod load reversal Modular system architecture that can be configured with other On-Guard family modules to meet your monitoring requirements Installation is simple, fast and inexpensive Can be mounted on the machine deck to reduce the length of cable runs Optional On-Guard diagnostic software for monitoring, analysis, reporting, and trending On-Guard software available in single user and multi-user network license versions

5 HP-Guard The HP-Guard "smart" module, a member of our On-Guard family, is Windrock's online solution for continuous indicated horsepower monitoring. The module was designed for those users who want to "safely" maximize throughput on their reciprocating compressors. The HP-Guard allows a level of control for reciprocating compressors not previously possible. For example, by knowing the actual horsepower load, the user knows whether or not the machine is functioning at an overloaded or underloaded condition. If more compression is needed, the operator knows, without relying on inaccurate load curves how much additional load the machine can carry. Rod loads and percentage of rod reversal are also continuously monitored so the user can assess the amount of tension and compression that the rod is undergoing. This extremely important information especially on high-speed compressors that, if ignored, can lead to catastrophic damage. Data Acquisition The HP-Guard module accepts up to twelve dynamic pressure sensors (six double-acting cylinders) plus crank angle referenced speed/phase input signals. The internal processor calculates cylinder end IHP, total load, dynamic rod loads, percentage of rod reversal, and cylinder end volumetric efficiencies. This calculated data, along with suction and discharge pressure and speed, is communicated to the user s PLC/DCS system via standard RS-485 com link. On-Guard software can be supplied to provide a local user display for monitoring and trending the compressor performance data. An optional relay is also available for remote alarm indication. If suction and discharge temperatures are available in the user s PLC/DCS, the data can be transferred to the HP-Guard module via RS-485 com link. With these temperatures available, the HP-Guard can calculate capacity, flow balance, theoretical discharge temperatures, and calculated clearances. Specifications Size: 8 inches high x 10 inches wide x 2 inches deep Weight: Less than 3 pounds Number of Channels: 12 pressure inputs (6 double-acting cylinders) plus speed / phase reference inputs (once per turn and once per degree) Alarms: Rod load, minimum rod reversal, total load, and max pressure Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Sensors rated for Class 1, Div I, Groups A, B, C, D areas. Outputs: PLC/DCS Interface - standard integer-based MODBUS RS-485, RTU. Alarm Analog mA isolated, loop-powered, scalable (user-defined range). Relay - Hermetically sealed, selectable N.O. or N.C. output logic Power: VDC, 250 ma Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

6 C-Guard On-Guard module for comprehensive reciprocating compressor cylinder monitoring The patented C-Guard "smart" module was designed to provide mechanical condition and compressor performance monitoring for critical compressor applications. The module (one per cylinder) accepts inputs from seven primary sensors, including head and crank end pressure, suction and discharge temperature, and cross head vibration plus a crankshaft speed/phase reference and two auxiliary channels for rod drop/runout, cylinder vibration, or additional temperature inputs. All inputs are monitored continuously and the internal processor calculates compressor IHP, rod loads, percent of rod reversal, volumetric efficiencies, capacity, clearances, theoretical discharge temperature, and other critical performance calculations. Key Features Utilizes Windrock s patented smart module Comprehensive mechanical condition and performance monitoring Alarms on excessive rod load, lack of rod load reversal, excessive rod drop or rod runout Modular system architecture that can be configured with other On-Guard family modules to meet your monitoring requirements Installation is simple, fast and inexpensive Can be mounted on the machine deck to reduce the length of cable runs Optional On-Guard diagnostic software for monitoring, analysis, reporting, and trending On-Guard software available in single user and multi-user network license versions Integrated intrinsic safety barriers

7 C-Guard Windrock's patented online monitoring system utilizes a family of "smart" modules to monitor the performance and mechanical condition of critical machinery, providing continuous machine protection. The intelligent and unique design of these "smart" modules significantly reduces the installed cost of a system. Each module accepts multiple inputs from a wide variety of sensors. The module has its own internal processor and memory and is capable of performing complex calculations, alarm detection, and error checking. Installation is fast and inexpensive because the modules are mounted on or near each machine's frame or cylinder and are connected with one small multi-wire cable. The monitoring solution for critical compressor cylinder performance and mechanical condition is the patented sevenchannel C-Guard. This smart module accepts inputs from two pressure sensors (head and crank end cylinder pressures), two temperature inputs (gas suction and discharge temperatures), one accelerometer. optional rod drop, and one auxiliary input. In addition, the C-Guard monitor accepts one or two speed/phase pickups. The internal processor continuously monitors all inputs in "real-time" and calculates compressor IHP, rod loading, rod reversal, percentage of load, and volumetric efficiencies. It compares the inputs and calculated results against alarm levels and communicates the value and alarm conditions back to the user's PLC/DCS systems via RS-485 (MODBUS) and/or Windrock's On-Guard diagnostic software running on a local or remote workstation. An optional alarm relay is available for remote alarm indication. Reports and Graphs Reports Compressor Performance Machinery Alarms System Alarms Diagnostic Plots Dynamic Plots (PVs) Multi-parameter Trends Multi-parameter Overlays Statistical Histograms X-Y Correlations Specifications Size: 8 inches high x 10 inches wide x 2 inches deep Weight: Less than 3 pounds Number of Channels: 7 sensor input channels for cylinder monitored (dynamic cylinder-end pressure, suction/discharge temperatures, vibration, rod drop/end runout, or auxiliary input) Alarms: Vibration, impact, load, rod loads, over-pressure and over-temperature Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Built-in I.S. barriers allow wiring and sensors to be located in Class 1, Div I, Groups A, B, C, D areas. Outputs: Easily integrated interface to User's PLC, DCS or PIE systems using standard integer-based MODBUS RS- 485, RTU, MODBUS/TCP or OPC. Alarm Relay - hermetically sealed, SPST, 1 Amp dry contact (optional) Power: +24 to +30 VDC, 200mA maximum Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

8 E-Guard The E-Guard module was designed to monitor power cylinders peak firing pressure (PFP) and angles. With today's "clean air" requirements, it is critical to know that your engine's power cylinders PFP are well balanced with consistent cycle-to-cycle combustion and no misfires or detonations in order to operate the unit with the lowest possible output of nitrous oxide and carbon monoxide. The E-Guard module accepts up to ten high temperature (A.C.) pressure sensors and provides statistical data on average PFP for each power cylinder, location of PFP, compression pressure and percentage of poor combustion, pre-combustion, and detonations. This information can be accessed by the user's PLC/DCS system via RS-485 com link to inform the operator of the need to balance the engine's power cylinders. An optional relay is available for remote alarm indication. Key Features Utilizes Windrock s patented smart module Peak pressure and angle statistics indicate consistency of combustion Monitor up to 10 power cylinders per module Modular system architecture can be configured with other On-Guard family modules to meet your monitoring requirements Installation is simple, fast and inexpensive Can be mounted at the machine to reduce the length of cable runs Optional On-Guard diagnostic software for monitoring, analysis, reporting and trending On-Guard software available in single user and multi-user network license versions

9 E-Guard The E-Guard smart module, a member of our On-Guard family of products, is Windrock s online solution for monitoring power cylinder combustion characteristics. With today s clean air requirements, it is critical to know that the peak firing pressure (PFP) in your engine s power cylinders are well balanced, performing with consistent cycleto-cycle combustion and without misfires or detonations. This information allows you to operate the unit with the lowest possible output of nitrous oxide and dangerous carbon monoxide. Windrock s online monitoring system provides continuous machine protection. The module has its own internal processor and memory and is capable of performing complex calculations, alarm detection and error checking. E-Guard is especially suited for 2-stroke natural gas fueled engines which tend to become unbalanced. Balancing all cylinder s peak pressure is very important to maintain good mechanical condition and to minimize emissions. Data Acquisition The E-Guard module accepts up to ten high temperature (AC) pressure sensors (or load washers mounted under a head bolt) plus a separate input for manifold pressure. The twelfth channel is for a reference sensor used to calibrate the dynamic pressure sensors. Due to the harsh environment the AC pressure sensor is subjected to, the E-Guard performs a number of sensor fault checks every cycle to insure the AC pressure sensor signals are valid. The module s internal processor calculates statistical data on average PFP for each cylinder, location of PFP, compression pressure, percentage of poor combustion, pre-combustion and detonations. In addition to peak pressures, E-Guard provides percent over pressure cycles, percent no or poor combustion cycles, and compression pressures. The information can be accessed by the user s PLC / DCS system via RS-485 com link to inform the plant s operators of the need to balance the engine power cylinders. An optional relay is available for remote alarm indication. Specifications Size: 8 inches high x 10 inches wide x 2 inches deep Weight: Less than 3 pounds Number of Channels: 10 dynamic pressure inputs plus speed / phase reference inputs (once per turn or once per turn and once per degree) manifold pressure input and reference pressure input for calibration Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Sensors rated for Class 1, Div I, Groups A, B, C, D areas. Outputs: PLC/DCS Interface - standard integer-based MODBUS RS-485, RTU. Alarm Relay - hermetically sealed, selectable N.O. or N.C. Power: VDC, 250 ma Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

10 P-Guard The P-Guard data acquisition module chassis provides a very low-cost solution for monitoring static machinery processes such as main bearing, oil and jacket water temperatures and pressures, or any other 4-20mA, 1-5 VDC, relay, or contact closing inputs. The P-Guard chassis can accept up to 128 inputs and can be linked to other On- Guard "smart" modules for alarming and trending. Key Features Utilizes Windrock s patented smart module Enables monitoring of additional parameters and communication via MODBUS Allows addition of phase referenced piston rod drop/rod runout measurements Modular system architecture can be configured with other On-Guard family modules to meet your monitoring requirements Installation is simple, fast and inexpensive Can be mounted at the machine to reduce the length of cable runs Optional On-Guard diagnostic software for monitoring, analysis, reporting, and trending On-Guard software available in single user and multi-user network license versions P-Guard The twelve channel module is a cost-effective method of obtaining a wide variety of critical process data for monitoring, trending, and alarming. By utilizing the P-Guard module, process data can now be easily correlated to the dynamic data captured by one of our other On-Guard modules, such as C-Guard, HP-Guard, V-Guard II, or E- Guard. Each P-Guard module has its own processor, memory, and multi-drop address and is easily connected to any of our other modules via a 2-wire interconnecting cable. The twelve channel module can also be used as a stand-alone device when connected to the user s PLC or DCS via a standard RS-485 com link. An optional alarm relay can provide remote annunciation. Data Acquisition The twelve inputs can be any standard 4-20 ma or 1-5 VDC loop-powered module. Engineering units, scale factor, and alarm levels are user programmable and are stored in non-volatile memory on the module. Typical module inputs are: Temperature for bearings, lube oil, jacket water, packing and suction/discharge gas Pressure for lube oil, jacket water, and fuel gas Vibration for cylinder, frame, and bearings on auxiliary components, such as oil pumps, fans, and turbocharger Rod drop/runout for rider band wear and piston motion

11 Specifications Size: 8 inches high x 10 inches wide x 2 inches deep Weight: Less than 3 pounds Number of Channels: Twelve (12) 4-20mA or 1-5 VDC Hazardous Area Ratings: Suitable for Class 1, Div. II, Groups A, B, C, D areas. Sensors rated for Class 1, Div II, Groups A, B, C, D areas. Outputs: PLC / DCS Interface - standard integer-based MODBUS RS-485, RTU Analog mA isolated, loop-powered, scalable (user-defined range) Alarm Relay - Hermetically sealed, selectable N.O. or N.C. output logic Power: VDC, 250mA Environmental Limits: -25 degrees F to +150 degrees (operating); -40 degrees F to +185 degrees (storage) up to 95% humidity (non-condensing)

12 ON-GUARD /DA SOFTWARE The On-Guard software is Windrock's monitoring and diagnostic software program which runs on Windows 95 or later versions. Single machine, multi-user, and multiple machine site license versions are available. This sophisticated program allows the user to monitor and trend all data inputs or those calculated within the system, in addition to graphing and printing dynamic plots and reports. It also includes Windrock's "expert" compressor diagnostic module. The On-Guard "expert" module provides WinWizard alarms to advise plant personnel of leaking valves, rings, lack of rod reversal, cylinder overloading, and vibration-related events when they occur. These meaningful alarms are powerful tools to the operators and provide clear information for most typical compressor malfunctions. The On-Guard /DA software runs on a Windows PC and is used to program the setup into the HP-Guard, E-Guard, C-Guard, V-Guard, or P-Guard boards. The On-Guard /DA can also run continuously to provide a PC view of the data being calculated by the modules. The On-Guard /DA software is not necessary for the X-Guard series boards to function. SET UP: Setup requires the use of On-Guard /DA software running on a Windows PC. A serial port equipped with an RS-232 to RS-485 converter such as a B&B 485SD9R is needed. The 2-wire RS-485 is connected to the COMM (J1) connector of the HP-Guard. Once the information is entered, it is stored in non-volatile memory. Then the system begins to scan and calculate horsepower. The connection to a computer to the Test Comm is not required, but any time a computer is connected to this connector, the horsepower and diagnostic information is available. Once the HP-Guard is configured, the configuration is stored in non-volatile memory on-board and the unit runs with or without the On-Guard /DA software. Data is available on the comm port of the MODBUS port. The MODBUS interface may be scanned at any rate and does not interfere with performance of the acquisition system. If the user s DCS is measuring suction and discharge temperatures, then the temperatures can be sent to HP-Guard via MODBUS. The temperatures must be in degrees F. VIEWING DATA WITH ON-GUARD This is the main viewing screen of On-Guard /DA. A user can view the data being collected by either the E-Guard or the HP-Guard boards. In the example above, the HP-Guard view is seen. In E-Guard, there are two views of the data; a spreadsheet view as shown above and a graphical view as shown below.

13 AutoBalance System Automatic Engine Balancing Technology PATENT PENDING Operators of slow-speed, industrial engines have a new option to help reduce emissions, cut fuel consumption, decrease wear and improve overall machine reliability. All of these benefits result from a properly balanced engine - and can now be achieved using a recently introduced system from Windrock. Key Features Continuously adjusts fuel flow to each power cylinder to maintain balanced operation Minimize emissions and fuel consumption over a wide range of operating loads Reduce mechanical wear and maintenance costs Reduce personnel costs and risk by eliminating manual engine balancing Supports engines with up to 20 power cylinders On-Guard Diagnostic software for monitoring, analysis, reporting and trending Supports automated air manifold pressure control for minimum emissions at varying loads Reduce or eliminate these conditions: Detonation Load variation induced balance fluctuations Emissions Fuel consumption Combustion instability Cylinder wear Bearing failures AutoBalance module supports a web browser interface for setup and monitoring Integrates with Windrock s On-Guard family of monitoring & control modules for an integrated engine/compressor monitoring & control system

14 AutoBalance System Operators of slow-speed, industrial engines have a new option to help reduce emissions, cut fuel consumption, decrease wear and improve overall machine reliability. All of these benefits result from a properly balanced engine - and can now be achieved using a recently introduced system from Windrock. The technology, called the AutoBalance system, automatically maintains optimal balance on engines 24/7. Windrock s AutoBalance system provides continuous,peak-pressure balancing for large-bore natural gas-fired engines. The system is designed for slow-speed, integral engines such as Cooper-Bessemer, Clark/Dresser, Ingersoll-Rand, Worthington, and other twoor four-stroke engines with individual cylinder fuel adjustment valves. Typical applications for these engines include natural gas gathering, transmission, processing and storage. Increasingly tighter emissions requirements are forcing operators to balance engines more frequently in an attempt to remain in regulatory compliance. To date, the only option has been auto-balancing using high-pressure fuel injection systems. The Windrock AutoBalance system was developed to be a more practical and cost-effective alternative. Compared to high-pressure fuel injection systems, an AutoBalance system is economical and easy to install, and unlike manual balancing, it maintains constant engine balance over extended periods without any human intervention. System Description Components of the system include: Stepper-motor actuated fuel valves (replacing manual valves) Pressure sensors on each cylinder Windrock E-Guard on-line pressure monitor AutoBalance module to control fuel valve positions All components are Class 1, Div 2 rated. The AutoBalance system is easy and inexpensive to install. The system incorporates self-diagnostics and requires no maintenance other than semi-annual, on-engine sensor calibration during normal unit operation. Principle of Operation The AutoBalance approach mimics traditional engine balancing, except that it is performed on a continuous basis instead of at routine time intervals. The objective is to adjust fuel flow to each power cylinder in order to maintain peak firing pressures within ± 5% of engine average. The E-Guard module measures peak firing pressure (PFP) statistics and angles for each power cylinder. Proprietary balancing algorithms utilize PFP and combustion statistics feedback to control fuel valve changes. These changes not only balance peak firing pressures but also optimize the consistency of combustion. Peak pressures are continuously maintained at a consistent level across all power cylinders of the engine. Results Eliminating unbalanced operation across all operating conditions enables the engine to run with the minimum possible NOx and CO emissions for the engine configuration. Windrock AutoBalance systems have demonstrated >25% reduction of NOx emissions (compared to standard controls), with engine balance maintained at ± 5% of average despite differing ambient conditions, varying speeds and changing loads. By maintaining optimum mechanical operating condition, the AutoBalance system practically eliminates detonation and uneven load distribution, dramatically improving reliability and reducing mechanical wear. Precisely maintained PFP balance also improves fuel economy from 1% to 5%.

15 Combining Windrock s AutoBalance system with improved air-fuel ratio control and/or pre-combustion chamber retrofits, allows emissions to be reduced to levels approaching high-pressure fuel injection systems but at a significantly lower cost. As emission regulations tighten and companies look for more environmentally responsible ways to operate, Windrock s AutoBalance system offers a practical solution. The AutoBalance system has a Fail-Safe feature that monitors peak pressure statistics, peak pressure angles and compression pressures to diagnose engine or sensor problems and if necessary, disables the autobalance function. Specifications Weight and Size: Number of Channels: Hazardous Area Rating: Communications: Local Storage: Power: Environmental Limits: Less than 3 pounds 8 inches high x 15 inches wide x 2 inches deep Controls up to 10 Fuel Control Valves. Optional slave module available to expand system to 20 Fuel Control Valves. Suitable for Class I, Div. II, Group D areas (Certification Pending) Ethernet (10/100) port, 2 x RS-485 Serial 2 GB SD card (removable) VDC, 1.5 A -25 F to +150 F (operating); -40 F to +185 F (storage); up to 95% humidity (noncondensing)