Related Manuals for GDS Corp GASMAX EC
Summary of Contents for GDS Corp GASMAX EC
- Page 1 Operation and Maintenance Manual GASMAX EC Loop-Powered Toxic Gas Monitor GDS Corp. 2513 Hwy 646 Santa Fe, Texas 77510 409-927-2980 409-927-4180 (Fax) ww.gdscorp.com...
- Page 2 GASMAX EC Operation & Maintenance Manual, Revision 3.5 CAUTION: FOR SAFETY REASONS THIS EQUIPMENT MUST BE OPERATED AND SERVICED BY QUALIFIED PERSONNEL ONLY. READ AND UNDERSTAND INSTRUCTION MANUAL COMPLETELY BEFORE OPERATING OR SERVICING. ATTENTION: POUR DES RAISONS DE SÉCURITÉ, CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ, ENTRETENU ET RÉPARÉ...
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Page 3: Table Of Contents
GASMAX EC Operation & Maintenance Manual, Revision 3.5 CONTENTS SAFETY INFORMATION _______________________________________________ 8 GENERAL INFORMATION ______________________________________________ 9 Introduction ________________________________________________________________ 9 GASMAX Sensors ____________________________________________________________ 9 SPECIFICATIONS ____________________________________________________ 10 INSTALLATION _____________________________________________________ 11 Locating the GASMAX EC _____________________________________________________ 11 Mounting the GASMAX Instrument Enclosure ____________________________________ 11... - Page 4 GASMAX EC Operation & Maintenance Manual, Revision 3.5 Alarm Operation – ALARM 1 and 2 _____________________________________________ 22 Alarm Operation – ALARM 3 __________________________________________________ 23 Sensor Replacement ________________________________________________________ 23 Sensor Replacement – Remote Sensors _________________________________________ 25 Normal Maintenance ________________________________________________________ 25 USER MENUS ______________________________________________________ 26...
- Page 5 GASMAX EC Operation & Maintenance Manual, Revision 3.5 Sensor settings page ________________________________________________________ 30 Install New Sensor _________________________________________________________________ 30 Recall Cal History __________________________________________________________________ 30 Input Type _______________________________________________________________________ 30 New Sensor ______________________________________________________________________ 30 Recent Cal _______________________________________________________________________ 30 CLOCK/DELAY SETUP Page ____________________________________________________ 31...
- Page 6 GASMAX EC Operation & Maintenance Manual, Revision 3.5 Raw Min / Max Counts _____________________________________________________________ 36 Marker Menu _____________________________________________________________________ 36 TROUBLESHOOTING GUIDE ___________________________________________ 37 Toxic Sensor Indicates Fault or Overrange _______________________________________ 37 Toxic Sensor Will Not Calibrate ________________________________________________ 37 Receiving Device and GASMAX Displayed Values Don’t Match _______________________ 37...
- Page 7 FIGURE 8-3: SET GAIN TO UNITY MENU ....................... 35 FIGURE 8-4: PREAMP GAIN SET MENU ......................35 FIGURE 10-1: GASMAX EC + LOCAL SENSOR SPARE PARTS ................39 FIGURE 10-2: GASMAX SENSOR HEAD SPLASH GUARD & FLOW CELL ............39 FIGURE 10-3: GASMAX EC REMOTE DIRECT SENSOR HEAD .................
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Page 8: Safety Information
Installation in any hazardous area must comply with all applicable restrictions, requirements and guidelines for said hazardous areas. It is the end user customer’s final decision to ensure that the GASMAX EC is suitable for the intended use. -
Page 9: General Information
A battery-powered real-time clock and event log allows the GASMAX EC to track calibration and alarm events for later recall on the LCD readout. GASMAX Sensors For toxic gases the GASMAX EC supports a wide range of electrochemical (“echem”) sensors. These sensors use chemical reactions to sense the presence of gases such as hydrogen sulfide, chlorine, sulfur dioxide and many others. -
Page 10: Specifications
10-30VDC at less than 0.75W Display 64 x128 pixel LCD with engineering units, bargraph and 30-minute trend Input Accepts microamp-level inputs from local or remote GDS Corp toxic or oxygen deficiency sensors Accuracy +/- 5% of full scale (typical) Standard Two-wire 4-20mA loop powered current sink with fault and overrange indication. -
Page 11: Installation
12 – 18 inches (30 – 45 cm) above the potential gas leak and heavier than air gases should be this distance below. Even though the GASMAX EC is designed for rugged service, sensors should be protected from environmental damage from water, snow, shock, vibration and dirt. -
Page 12: Mounting The Gasmax Remote Sensor Enclosure
Figure 4-2: GASMAX EC Remote Sensor Explosion Proof Installation GASMAX EC monitors with standard explosion-proof sensor heads are certified for use in Class 1 Division 1 hazardous areas. Installation in these areas should follow best industry standard practices and all appropriate electrical codes. -
Page 13: Intrinsically Safe Installation
Shielded wire is recommended for all low power signal runs. Connecting Loop Power / Signal Wiring To access the GASMAX signal / power connections, remove the cover on the GASMAX EC explosion-proof enclosure. Loosen the 2 thumbscrews holding the display assembly in place and remove it. Route the power / signal wires through the conduit entry and connect to green terminal block “TB1”... -
Page 14: Local Smart Sensor
GASMAX EC Operation & Maintenance Manual, Revision 3.5 Local Smart Sensor Local toxic sensors are factory installed in a sensor head directly attached to the GASMAX EC enclosure. Local toxic sensors are always connected to the Smart Sensor connector “S1” located on the back of the Display Assembly (See Fig.4-4). -
Page 15: Connecting A Remote Sensor
Due to the small signal output from toxic sensors, remote direct input toxic sensors should be mounted no more than 15 wire-feet from the GASMAX EC display. Further, the cable used should be three-wire stranded with foil shield and should be run inside metallic rigid conduit. GDS Corp recommends Belden B8771. -
Page 16: Initial Setup
Intrinsically safe wiring. Important: Only GASMAX EC two-wire models may be applied as intrinsically safe installations. 409 -927-2980 The GASMAX EC may be fitted with any CSA certified compatible XP toxic sensor head. The hazardous location installa- tion is limited to an area governed by the lowest group rating of the assembly’s parts. - Page 17 LEDs only (Sec 6-3). Allow the GASMAX EC to stabilize for at least four hours, preferably overnight if possible. This will allow the sensor to reach stable equilibrium with respect to environmental conditions such as ambient temperature, humidity, and barometric pressure as well as applied “reference”...
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Page 18: Calibration
During the following CAL PURGE DELAY time, the GASMAX EC transmits a fixed 4.0 mA signal to prevent external alarms during calibration. In the case of local or remote Oxygen sensors, during CAL PURGE DELAY the output simulates a typical atmospheric reading of 20.8%. -
Page 19: Calibration Procedure
If necessary, a cylinder of ‘zero air’ may be necessary if the absence of target gas cannot be confirmed. GDS Corp recommends a flow rate of 0.5 liters / minute for standard gases and a flow rate of 1.0 liters / minute for highly reactive gases such as chlorine or chlorine dioxide. -
Page 20: Figure 5-2: Calibration Flowchart
4. Immediately shut off the regulator and remove the calibration cup. At the end of the CAL PURGE delay, the GASMAX EC output is re-enabled and the unit is fully operational. The flow chart shown in Figure 5-2 illustrates the above procedure. UP, CAL, NEXT & EDIT labels indicate keystrokes using the magnetic wand. -
Page 21: Operation And Maintenance
GASMAX EC Operation & Maintenance Manual, Revision 3.5 6 OPERATION AND MAINTENANCE GASMAX Display Screens The GASMAX display is shown in Figure 2-1. There are four magnetic switches on the face of the GASMAX, arranged in a quadrant around the LCD display. Starting in the upper right and proceeding clockwise these are labeled NEXT, EDIT, DOWN/CAL and UP. -
Page 22: Trend Display Screen
Alarm Operation – ALARM 1 and 2 GASMAX EC’s have front panel LED indicators for ALARM 1 and ALARM 2. Both alarm indicators can be set to activate above or below a given engineering units set point. Alarm processing will trigger an alarm... -
Page 23: Alarm Operation - Alarm 3
If a sensor shows FAULT, does not respond to gas or can no longer be calibrated, it should be replaced. GASMAX EC monitors use GDS Corp type 10-95XX sensors, where the XX is the gas type shown in Section 3. The range value should also be specified when ordering replacement sensors. For example, a replacement H2S sensor for 0-100 ppm would be “10-9515-R0100”. -
Page 24: Figure 6-4: Sensor Replacement
Sensor. If the sensor is the same gas type as was previously installed, the sensor’s calibration data will be uploaded into the GASMAX EC. All other parameters stored in the GASMAX EC will be retained. GASMAX EC units can be reconfigured for different sensors by simply installing a different type compatible sensor. -
Page 25: Sensor Replacement - Remote Sensors
6. At the GASMAX EC, activate the Main Menu, open the Sensor Information page and select Install New Sensor. This will reset the Sensor Life settings and tell the GASMAX EC that a new sensor is available. NOTE: If the new sensor is of a different TYPE, a number of other settings, including input type, range, cal span value and others may have to be changed. -
Page 26: User Menus
7 USER MENUS Main Menu GASMAX EC setup variables are stored in non-volatile memory and can be modified by the end user to better match a particular application. The GASMAX EC Main Menu tree is shown below. To access the Main Menu, swipe the magnetic wand over the EDIT key. -
Page 27: System Configuration Page
4mA (0%) is the GASMAX EC output. SPAN (100%) defines the reading to be displayed when 20mA (100%) is the GASMAX EC output. The highest reading allowed is 9999 including negative polarity sign. Polarity is only indicated for negative readings. -
Page 28: Temp Compensation
CAL PURGE delay to allow time for the span gas to dissipate. With TX Sensor Life = YES, the GASMAX EC transmits 4mA for the first 10 seconds, then for 5 seconds transmits a value between 4mA and 5mA, with 4mA equal to 0% sensor life and 5mA equal to 100% sensor life (see Figure 5-5). The output then returns to 4mA for the remainder of the CAL PURGE delay. -
Page 29: Alarm Settings Page
GASMAX EC Operation & Maintenance Manual, Revision 3.5 Alarm Settings Page The Alarm Settings page covers the Alarm 1, 2, 3 Setup and Event Log menu items. Alarm 1, Alarm 2 and Alarm 3/Fail menus are identical and are therefore described only once in this section. For the GASMAX EC, the alarm settings only affect the operation of the front panel LEDs. -
Page 30: Display Event Log
CAL data and sets sensor life to 100% after initial calibration of the new simple sensor. The GASMAX EC Smart Sensor interface will automatically detect new Smart Sensors and this menu is therefore not available with a Smart Sensor connected. -
Page 31: Clock/Delay Setup Page
GASMAX EC Operation & Maintenance Manual, Revision 3.5 CLOCK/DELAY SETUP Page The GASMAX EC is equipped with a crystal-controlled, battery-backed real-time clock that maintains local Time and Date. These values are factory preset to US Central Time and should be reset to correctly match the current time zone during installation to make sure that time-stamped Event Log entries are correct. -
Page 32: Output Simulation
Figure 7-8: DIAGNOSTICS MENU OUTPUT SIMULATION allows setting the 4-20mA output to virtually any desired value. This is useful for checking responses of devices receiving the GASMAX EC’s 4-20mA output. RELAY TEST is not supported on a GASMAX EC. WARNING: GAS MONITORING AND ALARM PROCESSING ARE NOT PERFORMED WHILE USING THE DIAGNOSTICS MENUS. -
Page 33: Technicians Menus
GASMAX EC. OUTPUT ZERO / SPAN TRIM provides a way to precisely set the GASMAX EC 4mA and 20mA outputs to compensate for variation in output components. These settings are programmed at the factory and should not be modified. -
Page 34: Technical Page Menu
Figure 8-2: TECHNICAL PAGE MENU SET BALANCE is for use with bridge-type sensors and is not available on the GASMAX EC. SET VOLTAGE is for use with bridge-type sensors and is not available on the GASMAX EC. -
Page 35: Preamp Gain Set
GASMAX EC signal conditioning circuits. Local Smart Sensors include factory- preset preamp gain values and for standard sensors and applications, these values should not be changed. -
Page 36: Zero Cal Value
GASMAX EC Operation & Maintenance Manual, Revision 3.5 Coefficient Electrochemical Sensor Type Default EUNITS Negative Hydrogen Sulfide ppm H2S Negative Oxygen % Oxygen Negative Carbon Monoxide ppm CO Negative, Bias Ammonia ppm NH3 Negative, Bias Nitric Oxide ppm NO Negative... -
Page 37: Troubleshooting Guide
Check that zero and full scale range values match between GASMAX and receiving device • (controller). Use DIAGNOSTICS menu to force GASMAX EC output to 12mA (1/2 scale) and verify appropriate half-scale reading on controller. Check for high impedance shorts to ground on 4-20mA wiring. - Page 38 GASMAX EC Operation & Maintenance Manual, Revision 3.5 03 – Sensor Calibration Error – Contact factory. • 04 – Zero calibration failure – Zero readings must be within 10% of zero. For example, if the • range is 0-100 ppm, the zero reading cannot be above 10 ppm. For bridge-type sensors, it may be possible to readjust the balance to restore a zero reading.
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Page 39: 10 Spare Parts
Toxic Direct / Reactive Gas (Type 3-4) Display: Note: Does not include sensor 10-0232 GASMAX Display Figure 10-1: GASMAX EC + Local Sensor Spare Parts Sensor Head Accessories Sensor Head Splash Guard 10-0198 Splash Guard (Fits all sensor heads) Sensor Head Flow Cell 10-0205 Flow Cell (1/8”... -
Page 40: Remote Sensor
GASMAX EC Operation & Maintenance Manual, Revision 3.5 Remote Sensor S—R—C Remote Sensor Head Assembly: R—C—A 20-0126 Remote Toxic or Bridge Direct (Type 5-6) 20-0127 Remote Toxic / Reactive Gas (Type 7-8) USE R-C-A for COMBUSTIBLE, CO2 or PID SE NSOR... -
Page 41: 11 Drawings And Dimensions
GASMAX EC Operation & Maintenance Manual, Revision 3.5 11 DRAWINGS AND DIMENSIONS Page 41...