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GASMAX/TX Operation & Maintenance Manual, Revision 1.0

Page 29

CALIBRATION PROCEDURE

Before beginning calibration, make sure you have the following items: A cylinder of calibration gas, fixed

flow regulator and an appropriate calibration cup connected to the regulator via a length of flexible

tubing. 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.

Figure 9-1: Calibration Setup

To calibrate a GASMAX/TX detector:

Calibration Cup

Fixed Flow Regulator

Cylinder of

Calibration Gas

Flexible Tubing

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Summary of Contents for GASMATX

Page 1: ...GDS Corp 2513 Hwy 646 Santa Fe Texas 77510 409 927 2980 409 927 4180 Fax ww gdscorp com Operation and Maintenance Manual GASMAX TX Battery Powered Dual Channel Wireless Gas Monitor ...

Page 2: ...COMPLETELY BEFORE OPERATING OR SERVICING ATTENTION POUR DES RAISONS DE SÉCURITÉ CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ ÉTUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE RÉPARER L ÉQUIPEMENT REVISION HISTORY Revision 1 0 8 1 13 Initial Release updated 11 22 13 Copyright 2013 GDS Corp All Rights Reserved P N 1200 0863 02 ...

Page 3: ...___ 17 Surge Protection Grounding_________________________________________________ 18 6 HARDWARE OVERVIEW______________________________________________ 19 7 INSTALLATION _____________________________________________________ 21 Locating the GASMAX TX ____________________________________________________ 21 Mounting the GASMAX TX ___________________________________________________ 21 Power and Signal...

Page 4: ...______________________________________________ 34 Sensor Replacement Remote Sensors _________________________________________ 35 Normal Maintenance________________________________________________________ 35 11 USER MENUS ____________________________________________________ 36 Channel Configuration Menu__________________________________________________ 37 Device Setup Menu _________________________...

Page 5: ...____________________________________________________ 47 Sensor Head Accessories _____________________________________________________ 48 Sensor Separation Kit________________________________________________________ 48 14 DRAWINGS AND DIMENSIONS ______________________________________ 49 15 NETWORK PARAMETERS ___________________________________________ 50 ...

Page 6: ...EP SETUP CHECKLIST 26 FIGURE 9 1 CALIBRATION SETUP 29 FIGURE 9 2 CALIBRATION FLOWCHART 30 FIGURE 10 1 GASMAX TX DATA DISPLAY SCREEN 31 FIGURE 10 2 DUAL DATA AND TREND DISPLAY SCREENS 32 FIGURE 10 3 GASMAX TX SENSOR REPLACEMENT 34 FIGURE 11 1 GASMAX TX MAIN MENU TREE 36 FIGURE 11 2 CHANNEL CONFIGURATION MENU 37 FIGURE 11 3 ALARM SETTINGS MENU 38 FIGURE 11 4 SMART SENSOR INFORMATION MENU 39 FIGURE 1...

Page 7: ...X TX Operation Maintenance Manual Revision 1 0 Page 7 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 8: ...ertain gases in ambient air Accuracy in atmospheres containing steam or inert gases cannot be guaranteed Always mount the sensor head vertically with the sensor head facing down Do not paint transmitter or sensor assembly Do not operate the GASMAX TX if its enclosure is damaged or cracked or has missing components Make sure the cover internal PCB s and field wiring are securely in place before app...

Page 9: ...ces while using very little power Battery life can be as long as one year under common circumstances Instead of complicated setup procedures that involve channel selection and identification codes the GASMAX TX is configured using a single network identifier letter and single device number When configured as part of a system with a third generation C2 TX Wireless Site Manager all configuration and...

Page 10: ... C Memory On board non volatile memory retains all user settings Housing Aluminum housing with epoxy paint standard 316 stainless steel optional Dimensions Width 5 4 137 mm Height 8 203 mm Depth 5 127 mm Shipping wt 6 5 lbs 3 kg Approvals Enclosure CSA certified for Class I Division 1 hazardous areas Warranty Two years on electronics one year on sensor AVAILABLE SENSORS AND RANGES P N Sensor Range...

Page 11: ...the sensor board amplify the signal PGA Gain and covert the information from analog to digital using a 12 bit A D converter If an ultra low power infrared sensor is being used hydrocarbon gases enter the sensor and block the passage of infrared light from the IR source to the detector An integrated microprocessor in the infrared sensor linearizes the value and converts the output to digital IMPORT...

Page 12: ...ERS OR WIRELESS SYSTEM SITE MANAGERS If the GASMAX TX determines that a data packet should be transmitted the following events take place Power is applied to the radio the radio is placed in receive mode and listens for the synchronization beacon transmitted by the site manager or controller receiver If the beacon is found the radio synchronizes to the beacon hopping pattern transmits the data pac...

Page 13: ...eir transmissions While the GASMAX TX is optimized for use with third generation controllers such as the C2 TX Wireless Site Manager the GASMAX TX can also be integrated into existing wireless networks that utilize a C1 Protector 16 channel controller C64 Protector 64 channel controller or C2 Quad Protector 4 channel controller In legacy mode the required Hop Channel System ID and RTU Address valu...

Page 14: ...an ideal balance between power consumption transmission distance and resistance to interference 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 r...

Page 15: ...ss than 102 dBm suggesting a distance of approximately 1000 meters However this calculation does not take into account additional loses due to intervening structures or foliage To minimize free space loss the combined height of the transmitter antenna and receiver antenna should exceed the diameter of the RF Transmission Zone see Fig 5 3 and at least 60 of the area inside the zone should be free o...

Page 16: ...signal gain by focusing the reception pattern in a more horizontal plane Rubber duck and collinear antennas provide best performance when installed with at least 1 to 2 wavelengths away from walls or steelwork Since wavelength proportional to frequency 900 MHz signals have a wavelength to approximately 12 inches and 2 4 GHz signals have a wavelength of about 3 inches Therefore 900 MHZ antennas sho...

Page 17: ...ll be mounted with vertical polarity then the Yagi s must also have vertical polarity see Fig 5 3 Care needs to be taken to ensure the Yagi is aligned correctly to achieve optimum performance Two Yagi antennas can be used for a point to to link In this case they can be mounted with the elements horizontally to give horizontal polarity There is a large degree of RF isolation between horizontal and ...

Page 18: ...ound Wireless devices should have a solid connection to earth via a ground stake or ground grid if the soil has poor conductivity 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 differ...

Page 19: ...rdware for the display The display attaches to the I O battery board via a short multi pin cable and two captive thumbscrews 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 adap...

Page 20: ... sensors located up to 15 feet from the GASMAX TX display Figure 6 3 shows the Sensor Separation Kit required for each remote sensor Figure 6 3 P N 10 0411 Remote Sensor Separation Kit Dual Local Sensors with Y Adapter GASMAX TX with Local and Remote Sensor Four wire Sensor Data Cable up to 15 ft 3m in length 15 3m Sensor Data Cable ...

Page 21: ...e sensor head to allow easy access for attachment of a Calibration Cup and or removal of the sensor head cover for sensor replacement Whenever possible the GASMAX TX should be mounted in a location that provides clear line of sight between the gas monitor and receiving antenna Both 900 MHz and 2 4 GHz signals will travel through masonry or wooden structures with minimal loss however large metal bu...

Page 22: ...n cables for remote sensors connect to TB 1 for channel 1 and to TB 2 for channel 2 When replacing the battery be careful to double check the polarity before installing Reversing the polarity will damage the internal electronics CONNECTING A REMOTE ANTENNA Additional information on remote antennas will be available in a future version of the GASMAX TX manual S1 Local Sensor Channel 1 TB 1 Remote S...

Page 23: ...ld ALWAYS be mounted vertically as shown and GDS Corp recommends side entry for all conduit runs NOTE THE SENSOR SEPARATION KIT DATA CABLE CAN BE CUT TO ANY LENGTH FROM THE 15 FT 3M CABLE PROVIDED THE DATA CABLE SHOULD NOT BE LENGTHENED 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 ...

Page 24: ... a second layer of self vulcanizing weatherproofing tape 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 The...

Page 25: ...tch display screens between DATA and TREND displays Activating DOWN CAL followed by EDIT while in display mode initiates Calibration Mode The EDIT key activates the USER MENU display mode When in user menu display mode use UP and DOWN to select an item EDIT to change an item and NEXT to exit the menu or function and return the GASMAX TX to display mode For the balance of this manual the term press...

Page 26: ...urn on the GASMAX TX by holding a magnetic wand over UP ON key for several seconds 7 Configure the network identifier A thru Z to match that chosen for the C2 TX WSM or system controller Find in Device Setup RF Link 8 Configure the RTU device ID for a unique value Find in Device Setup RF Link 9 Program channel tag name if desired Find in Channel Setup 10 Select C2 TX channel and set Remote Address...

Page 27: ...rochemical 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 and counter voltages generated by the GASMAX TX electronics At this point the GASMAX TX can be calibrated and made operational INITIAL SETUP LEGACY MODE Additional information will be available i...

Page 28: ... no keystrokes are detected after 5 minutes Follow these GASMAX TX calibration guidelines Calibration accuracy is only as good as the calibration gas accuracy GDS Corp calibration gases are traceable to NIST National Institute of Standards and Technology Never use calibration gas that has passed its expiration date Check the SPAN GAS VALUE setting and make sure it matches the calibration gas See F...

Page 29: ...gulator via a length of flexible tubing 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 Figure 9 1 Calibration Setup To calibrate a GASMAX TX detector Calibration Cup Fixed F...

Page 30: ... complete the SPAN GAS calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay 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...

Page 31: ... that the GASMAX TX microprocessor is in low power sleep mode Indicates that the GASMAX TX microprocessor is awake and reading the sensor data Indicates that the GASMAX TX is trying to synchronize with the beacon Indicates that the beacon was successfully detected and that a data transmission is in progress Indicates that the beacon signal was not received during the most recent attempt to transmi...

Page 32: ...m 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 This allows controller receivers to confirm the presence of the gas monitor or issue a COMM ERROR is no transmission is received in a fixed interval default is 18 minutes but can be adjus...

Page 33: ...between each transmission Increasing the TX Multiples value will increase battery usage but may reduce communications errors in noisy environments Setting the TX Config value The TX Config setting determines how often the GASMAX TX transmits the large data packet that contains configuration data The default is 60 minutes Decreasing the TX Config interval will slightly increase battery power usage ...

Page 34: ...uld be 10 9715 R0100 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 2 Unscrew the sensor head cover If unable to open the cover by hand use a Sensor Head Replacement Tool p n 10 0187 3 Remove the old sensor by pulling straight ...

Page 35: ... shows EDIT at Accept then pressing the EDIT key 2 Unscrew the remote sensor head cover If unable to open the cover by hand use a Sensor Head Replacement Tool p n 10 0187 3 Remove the old sensor by pulling straight down NOTE DO NOT TRY TO UNSCREW THE SENSOR PULL STRAIGHT DOWN 4 Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow engraved on the sensor head P...

Page 36: ...3 Born On 09 03 13 Last Cal 11 13 13 NEXT key to exit WARNING WARNING WARNING WARNING Previous calibration will be erased EDIT to Continue NEXT to Exit PGA SETUP PGA SETUP PGA SETUP PGA SETUP Gain 67 4 Counts 805 Reading 0 2 Up Dn to change NEXT to Exit READING ALM SIMULATE READING ALM SIMULATE READING ALM SIMULATE READING ALM SIMULATE Reading 0 Alarm 1 Alarm 2 Alarm 3 Fault Transmit Packet TECHNI...

Page 37: ...e edited in this menu ZERO 0 defines the reading to be displayed when the input is at 0 SPAN 100 defines the reading to be displayed when the input is at 100 The highest reading allowed is 9999 including negative polarity sign Polarity is only indicated for negative readings DECIMAL POINTS set the resolution of the LCD readings and may be set for 0 1 or 2 For example ZERO readings for 0 1 2 decima...

Page 38: ...occur in the GDS 95 Wireless Alarm Station and C2 TX Wireless Site Monitor SET POINT enters the engineering unit value where the alarm trips It may be negative and trip when monitored values fall out of range in this direction Fault has a default setting of negative 10 with Low Trip set for YES It is important to adjust this value when the transmitter s span value is set for another value other th...

Page 39: ...nge of the 12 bit analog to digital converter Raw Min Counts represents 0 of scale and Raw Max Counts represents 100 of scale Under certain conditions these counts values can be adjusted to remove excessive offset or increase the apparent gain of the sensor Raising or lowering the value of the Raw Min Counts will adjust the sensor zero point and reducing the Raw Max Counts will amplify the sensor ...

Page 40: ... gain value resets the calibration Gain and Offset values to their default values of 1 000 and 0 000 The current PGA gain value is shown in percent and can be increased or decreased by pressing the UP or DOWN keys WARNING A FULL CALIBRATION SHOULD ALWAYS BE PERFORMED AFTER ANY CHANGE IN THE PREAMP GAIN SETTING WARNING WARNING WARNING WARNING Previous calibration will be erased EDIT to Continue NEX...

Page 41: ...pseudo random radio frequency hopping pattern and system identifier A transmitter will not go In Range of or communicate with another transmitter operating with a different Network Identifier Different Network Identifiers can be used to prevent radios in one network from listening to transmissions of another Installations having more than one Server network should also have different Network Ident...

Page 42: ...voltage and in range condition TX COUNT keeps track of the number of data packets sent by the GASMAX TX The counter is 32 bit binary and can count up to 4 2 million transmissions 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 broadca...

Page 43: ...digit code appears near the bottom of the screen SECURE LEVEL sets LOW HIGH or OFF modes A LOW level allows CAL MODE sensor calibrations but requires the 4 digit Pass Code prior to altering menus HIGH level locks the entire menu database and the CAL Mode until the correct Pass Code is entered LOW and HIGH security levels always allow static viewing of configuration menus Figure 11 12 LCD Contrast ...

Page 44: ...ice 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 WARNING WARNING WARNING WARNING TURNING OFF POWER EDIT to Accept NEXT to Abort DEVICE SETUP DEVICE SETUP DEVICE SETUP DEVICE SETUP RF Link Setup Clock Delays Security LCD Contrast Turn Power OFF Reset Range Icon ...

Page 45: ...ir a mixture of oxygen and nitrogen to zero the sensor Sensor output drifted above calibration maximum limit or drifted below fault limit Sensor is defective and should be replaced GASMAX TX EXHIBITS UNUSUAL OR UNEXPECTED BEHAVIOR Reload sensor defaults see Perform a Cold Boot to re initialize the entire system To perform a Cold Boot hold the magnet over the UP ON key until the display reads Relea...

Page 46: ...ations WSM beacon not set for SERVER if primary network manager Antenna connection compromised or antenna broken WIRELESS SITE MANAGER DISPLAYS COMM ERROR FOR ALL GASMAX TX Network Identifiers do not match 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...

Page 47: ...lay no radio 1000 2188 900 MHz radio module 1000 2454 2 4 GHz radio module 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 Antenna Coupler 10 0295 Antenna coupler RP TNC 1200 0482 C1D1 rated antenna coupler ...

Page 48: ...T Figure 13 3 GASMAX TX Remote Sensor Separation Kit Splash Guard Flow Cell Sensor Head Splash Guard 10 0198 Splash Guard Fits all sensor heads Sensor Head Flow Cell 10 0205 Flow Cell 1 8 NPT compression fittings 10 0205s Other specify Remote Sensor Head Assembly 20 0162 Remote Toxic Combustible 20 0123 Remote Toxic Reactive Gas Note Does not include sensor ...

Page 49: ...GASMAX TX Operation Maintenance Manual Revision 1 0 Page 49 14 DRAWINGS AND DIMENSIONS Figure 14 1 GASMAX TX Dimensions Single Local Sensor 5 1 5 00 15 1 with 900 MHz antenna 19 2 with 2 4 GHz antenna ...

Page 50: ... 2 478 GHz Yes H 8 8 No 902 928 MHz 2 402 2 478 GHz Yes I 9 9 No 902 928 MHz 2 402 2 478 GHz Yes J 10 10 No 902 928 MHz 2 402 2 478 GHz Yes K 11 11 No 902 928 MHz 2 402 2 478 GHz Yes L 12 12 No 902 928 MHz 2 402 2 478 GHz Yes M 13 13 YES 902 928 MHz 2 402 2 478 GHz No N 14 14 YES 902 928 MHz 2 402 2 478 GHz No O 15 15 YES 902 928 MHz 2 402 2 478 GHz No P 16 16 YES 902 928 MHz 2 402 2 478 GHz No Q ...

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