Summary of Contents for GDS GASMAX
- Page 1 Operation and Maintenance Manual GASMAX/TX Battery-Powered Dual Channel Wireless Gas Monitor GDS Corp. 2513 Hwy 646 Santa Fe, Texas 77510 409-927-2980 409-927-4180 (Fax) ww.gdscorp.com...
- Page 2 GASMAX/TX Operation & Maintenance Manual, Revision 1.0 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
Connecting A GASMAX/TX Remote Sensor _______________________________________ 23 Sealing Antenna and cable Fittings _____________________________________________ 24 Use in Hazardous Areas ______________________________________________________ 24 INITIAL SETUP______________________________________________________ 25 power-on and User Interface __________________________________________________ 25 Setting Up the GASMAX/TX and C2/TX Wireless Site Manager _______________________ 26 Page 3... - Page 4 GASMAX/TX EXHIBITS UNUSUAL OR UNEXPECTED BEHAVIOR _______________________ 45 GASMAX/TX Display Blank ___________________________________________________ 45 GASMAX/TX and C2/TX Wireless Site Manager Displayed Values Don’t Match __________ 45 Wireless Site Manager DISPLAYs Comm Error For a Single GASMAX/TX _______________ 46 Wireless Site Manager DISPLAYs Comm Error For aLL GASMAX/TX ___________________ 46...
- Page 5 GASMAX/TX Operation & Maintenance Manual, Revision 1.0 SPARE PARTS ____________________________________________________ 47 Display & Enclosure _________________________________________________________ 47 Sensor Head Accessories _____________________________________________________ 48 Sensor Separation Kit ________________________________________________________ 48 DRAWINGS AND DIMENSIONS ______________________________________ 49 NETWORK PARAMETERS ___________________________________________ 50 Page 5...
- Page 6 FIGURE 11-11: SECURITY MENU ......................43 FIGURE 11-12: LCD CONTRAST MENU ..................... 43 FIGURE 11-13: POWER OFF MENU ......................44 FIGURE 13-1: GASMAX/TX + LOCAL SENSOR SPARE PARTS ..............47 FIGURE 13-2: GASMAX SENSOR HEAD SPLASH GUARD& FLOW CELL ............48 Page 6...
- Page 7 GASMAX/TX Operation & Maintenance Manual, Revision 1.0 FIGURE 13-3: GASMAX/TX REMOTE SENSOR SEPARATION KIT ..............48 FIGURE 14-1: GASMAX/TX DIMENSIONS (SINGLE LOCAL SENSOR) ............49 FIGURE 15-1: GDS CORP NETWORK IDENTIFIERS ..................50 Page 7...
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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/TX is suitable for the intended use. -
Page 9: General Information
The GASMAX/TX can also be used in ‘legacy mode’ with existing GDS Corp Wireless Controller / Receivers such as the C1 Protector, C64 Protector or C2 Quad Protector Controller / Receiver. -
Page 10: Specifications
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 3 SPECIFICATIONS Power Disposable 3.6v Lithium-Ion battery (D-size) Display 64 x128 pixel LCD with engineering units, bargraph and 30-minute trend Ch 1 Input Digital input from local or remote type 10-97xx toxic or infrared sensors... -
Page 11: Operation
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 4 OPERATION The GASMAX/TX wireless gas monitor is designed to detect dangerous levels of toxic or hydrocarbon combustible gases and transmit that information to a GDS Corp remote site manager or controller / receiver. - Page 12 2 seconds and tries again, then waits 2 seconds and tries once more. If the third attempt fails an “Out of Range” icon is displayed and the GASMAX/TX goes to sleep until the next six second interval occurs. The “Out of Range” event will be logged in the Event Log.
- Page 13 Identifier (“A” - “Z”) that determines the radio’s frequency hopping pattern and system identifier. In addition, each GASMAX/TX must also have a unique device ID (1 - 240) that allows the controller to identify the specific gas detector. Finally, there must be one device that transmits the synchronizing Beacon signal that all radios use to synchronize their transmissions.
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Page 14: Wireless System Basics
(As necessary) Figure 5-1: GDS Corp Wireless System Architecture In each GDS Corp system, one device is configured as the “beacon server”. This device transmits a modulated carrier signal that all other radios use to synchronize their frequency-hopping pattern. Knowledge of the selected hopping pattern programmed into the radio and synchronization data from the beacon enables each radio to know when to transmit, and on what frequency. -
Page 15: Transmission Distance
Raising the antenna at either end of the path will improve signal strength and reduce transmission errors. GDS Corp recommends placing the GASMAX/TX at least 5 feet above the surrounding terrain, and even more if possible. However, note that the standard antenna transmits its maximum signal strength in a relatively flat ‘donut-shaped’... -
Page 16: Monopole And Collinear Omni-Directional Antennas
54’ / 17m N/A Figure 5-3: RF Transmission Zone GDS Corp always recommends that a wireless survey be completed at the site to ensure the integrity of the wireless communications link. Special care should be taken to account for moveable obstacles such as cranes, railroad cars, trucks, containers, and any other large ‘structures’... -
Page 17: Yagi Directional Antennas
Figure 5-4: Vertically Polarized Omni-Directional and YAGI Antennas COAXIAL CABLES When installing a coaxial cable between the GASMAX/TX and a remote antenna, constructing a loop of cable below the antenna is always recommended. The loop allows water to drip off the bottom of the U... -
Page 18: Surge Protection & Grounding
Solid connection means a large capacity conductor (not a small wire) with no coils or sharp bends. All other devices connected to the GASMAX/TX, such as remote sensors, should be grounded to the same ground point is possible. There can be significant resistance between different ground points leading to very large voltage differences during lightning activity. -
Page 19: Hardware Overview
Figure 6-1: GASMAX/TX with Single Local Sensor The GASMAX/TX wireless gas monitor is capable of monitoring two separate sensors. In certain cases, it is appropriate to co-locate both sensors in a ‘local sensor’ configuration. When doing so, the GASMAX/TX is configured with a Y-adapter that supports two independent electrochemical or infrared sensors (See Fig. -
Page 20: Figure 6-2: Gasmax/Tx With Dual Sensors
Dual Local Sensors with “Y” Adapter Figure 6-2: GASMAX/TX with Dual Sensors The GASMAX/TX also supports remote sensors located up to 15 feet from the GASMAX/TX display. Figure 6-3 shows the Sensor Separation Kit required for each remote sensor. 15’ / 3m... -
Page 21: 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/TX is designed for rugged service, sensors should be protected from environmental damage from water, snow, shock, vibration and dust and dirt. -
Page 22: Power And Signal Wiring
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 POWER AND SIGNAL WIRING The GASMAX/TX is completely self-contained. Power is provided by the internal 3.6V battery, and output data is sent entirely via wireless transmission from the local or remote antenna. S2 - Local Sensor Channel 2... -
Page 23: Connecting A Gasmax/Tx Remote Sensor
GASMAX/TX monitors with remote-mount sensors are shipped as separate pieces and must be assembled by the customer. The data cable connects to the I/O battery board in the GASMAX/TX, using “TB1” for channel 1 and “TB2” for channel 2. Connect the VCC, SCL (serial clock), SDA (serial data) and Common as shown. -
Page 24: Sealing Antenna And Cable Fittings
(#1000-2314), with a final layer of electrical PVC tape. USE IN HAZARDOUS AREAS The GASMAX/TX enclosure and sensor head with integral flame arrestor are certified for use in Class 1 Division 1 hazardous areas. When combined with the optional XX Class I Division 1 antenna coupler, the entire device is suitable for use in Class 1 Division 1 areas. -
Page 25: Initial Setup
See Chapter 11 for a detailed description of the User Menu. All that is necessary to integrate a GASMAX/TX into a GDS Corp wireless network is to select the Network Identifier and Device ID. Each device in any given GDS Corp wireless network should have the same Network Identifier, and each GASMAX/TX should have a different Device ID. -
Page 26: Setting Up The Gasmax/Tx And C2/Tx Wireless Site Manager
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 SETTING UP THE GASMAX/TX AND C2/TX WIRELESS SITE MANAGER To successfully setup a wireless network, perform the following steps in order: GASMAX/TX Gas Monitor C2/TX Wireless Site Manager Apply AC or DC power to the C2/TX Wireless... -
Page 27: Initial Setup - Legacy Mode
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 After power-up, allow the GASMAX/TX to stabilize for one to eight hours prior to any initial calibration (see GDS Corp Electrochemical Sensor manual for more details on specific electrochemical sensors). 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”... -
Page 28: Calibration
800 counts (0% of scale). However, if an oxygen sensor is detected, then the GASMAX/TX will transmit a data packet with a value of 3475 counts (83.6% of scale) to simulate the typical 20.9% value found in atmospheric oxygen levels. -
Page 29: 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 30: Figure 9-2: 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 31: Operation And Maintenance
Indicates that the beacon signal was not received during the most recent attempt to transmit data. The GASMAX/TX will not attempt to transmit until a beacon signal is present. Indicates a “Range Warning”. This icon is presented if the server was previously out of range for any reason and can be reset using the Device Setup –... -
Page 32: Trend And Dual Data Display Screens
/ receiver. This data packet includes the gas value, alarm and fault status bits and battery voltage. The GASMAX/TX will initiate a data packet transmission under the following specific conditions: Every time the Wakeup Timer expires, irrespective of the gas level present. -
Page 33: Optimizing Battery Life
Reduce the power output for 900MHz radios – Transmit power at 900 MHz can be adjusted from 1 • watt (max) down to 10 milliwatts (min). Since most of the power consumed by the GASMAX/TX is used by the radio to transmit, reducing the power output will increase battery life. However, this will reduce the strength of the transmitted signal and may increase communications errors. -
Page 34: Sensor Replacement
To replace a sensor, follow these steps: 1. Turn off the GASMAX/TX by accessing the Device Setup – Turn Power Off menu or holding the magnet over the NEXT key until the display shows “EDIT at Accept, then pressing the EDIT key. -
Page 35: Sensor Replacement - Remote Sensors
To replace a remote sensor, follow these steps: 1. Turn off the GASMAX/TX by accessing the Device Setup – Turn Power Off menu or holding the magnet over the NEXT key until the display shows “EDIT at Accept, then pressing the EDIT key. -
Page 36: User Menus
11 USER MENUS The GASMAX/TX Main Menu tree is shown below. To access the Main Menu, swipe the magnetic wand over the EDIT key. Use the UP and DN keys to select an item and press EDIT. Use NEXT to exit a menu. -
Page 37: Channel Configuration Menu
0, 1 & 2 decimal points displays as “0”, “0.0” & “0.00”. CAL SPAN VALUE sets the engineering units value of the calibration gas. GDS Corp recommends that the calibration gas value be between 25% and 75% of full scale. Calibrating at 100% of scale is not recommended. -
Page 38: Figure 11-3: Alarm Settings Menu
The Alarm Settings page covers the Alarm 1, 2 and 3 menu items. Alarm 1, Alarm 2, Alarm 3 and Fault menus are identical and are therefore described only once in this section. For the GASMAX/TX, the alarm settings not only control the status of the indicator LEDs, but also cause alarm conditions to occur in the GDS-95 Wireless Alarm Station and C2/TX Wireless Site Monitor. -
Page 39: Figure 11-4: Smart Sensor Information Menu
Smart Sensor database. Values cannot be user-modified. TYPE indicates what kind of input or sensor the GASMAX/TX is configured to accept and is typically pre- configured at the factory. When installed, Smart Sensors upload sensor type and other data to the GASMAX/TX and this data may be viewed on the SMART SENSOR information screen. -
Page 40: Figure 11-6: Set Unity Gain Menu
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 TECHNICIANS MENU TECHNICIANS MENU ***** WARNING ***** ***** WARNING ***** TECHNICIANS MENU TECHNICIANS MENU ***** WARNING ***** ***** WARNING ***** Set Gain to Unity Previous calibration PreAmp Gain Set will be erased Zero Cal Value... -
Page 41: Device Setup Menu
Figure 11-8: RF Link Test Menu RF LINK TEST The RF Link Test is a diagnostics tool which allows the user to cause the GASMAX/TX to transmit simulated readings of 0%, 25%, 50%, 75% and 100% of scale without actually applying gas. -
Page 42: Figure 11-10: Clock / Delay Menu
RF HANDSHAKING determines whether the remote receiver is expected to return a ‘data received’ message. If set to “OFF”, the GASMAX/TX broadcasts the same packet three times in quick succession. If set to “ON” the GASMAX/TX broadcasts a single copy of the data packet and waits for a reply from the system server. -
Page 43: Figure 11-11: Security Menu
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 DATE adjusts date in month, day and two-digit year. WARM UP DELAY sets the amount of time from power-on until the 4-20mA output signal begins to track the sensor output. Default setting is 60 seconds. Maximum value is 255 seconds. -
Page 44: Figure 11-13: Power Off Menu
Figure 11-13: Power Off Menu TURN POWER OFF To turn the GASMAX/TX off, select the Device Setup – Turn Power Off menu or hold the magnet over the NEXT key until the display shows “EDIT to Accept, and then press the EDIT key. -
Page 45: Troubleshooting Guide
NOTE: COLD BOOT CLEARS ALL DEVICE SETTINGS, INCLUDING NETWORK IDENTIFIER AND DEVICE ID. BE SURE TO RECORD THESE VALUES BEFORE PERFORMING THE COLD BOOT PROCEDURE. GASMAX/TX DISPLAY BLANK Turn the GASMAX/TX on by holding a magnetic wand over the UP/ON key • Open enclosure and inspect battery for proper installation. -
Page 46: Wireless Site Manager Displays Comm Error For A Single Gasmax/Tx
No synchronizing beacon signal. Verify C2/TX RF Mode = SERVER and verify GASMAX/TX “Server • in Range” icon displayed. RF signal attenuated. Check C2/TX WSM antenna connection, cable and remote antenna (if • installed). Place a GASMAX/TX in close proximity with the C2/TX WSM and check for proper operation. Page 46... -
Page 47: Spare Parts
Yellow Enclosure: 10-0160 GASMAX Enclosure Battery PCB: 10-0407 Battery PCB 1000-2721 Replacement 3.6V Battery Sensor Head Assembly: 10-0247 For standard gases 10-0247F For reactive gases Note: Does not include sensor Figure 13-1: GASMAX/TX + Local Sensor Spare Parts Page 47... -
Page 48: Sensor Head Accessories
10-0205 Flow Cell (1/8” NPT compression fittings) 10-0205s Other (specify) Splash Gu ard Flow Cell Figure 13-2: GASMAX Sensor Head Splash Guard& Flow Cell SENSOR SEPARATION KIT Remote Sensor Head Assembly: 20-0162 Remote Toxic / Combustible 20-0123 Remote Toxic / Reactive Gas... -
Page 49: Drawings And Dimensions
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 14 DRAWINGS AND DIMENSIONS 15.1” with 900 MHz antenna 19.2” with 2.4 GHz antenna 5.1” 5.00” Figure 14-1: GASMAX/TX Dimensions (Single Local Sensor) Page 49... -
Page 50: Network Parameters
GASMAX/TX Operation & Maintenance Manual, Revision 1.0 15 NETWORK PARAMETERS The set of Network Identifiers used by the GASMAX/TX specify a combination of frequency hopping pattern, frequency band, System ID value and whether or not the data is encrypted using a proprietary software-based algorithm.
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