G-Shield Instruction Manual 1 Introduction The G-Shield Fire is a gas detection system that attaches to a vehicle. It has a Human Machine Interface (HMI), two Sensor Platforms, and two G-Pods. One G-Pod detects Hydrogen Cyanide (HCN) and the other detects Carbon Monoxide (CO).
G-Shield Instruction Manual 5 List of Figures Figure 1. G-Shield Fire HMI shown in optional enclosure with two Sensor Platforms and a G-Pod. Figure 2. Keywords and symbols used in this manual. Figure 3. The G-Shield Fire HMI. Figure 4. The G-Shield Fire HMI fitted to its optional enclosure.
WARNING: The G-Shield Fire detects HCN and CO. These gases can cause injury or death to personnel. WARNING: The G-Shield Fire is not a personal gas detector. If you do not use a personal gas detector this can cause injury or death to personnel.
Installation. Figure 3. The G-Shield Fire HMI. The G-Shield Fire is available with an enclosure. Use the enclosure when it is not possible to install the HMI directly into the dashboard. The enclosure is compliant with the VESA 75 requirements.
Calibrate the G-Pod in the workshop or maintenance section for fast deployment. The G-Shield Fire is supplied with one HCN G-Pod, and one CO G-Pod. Figure 6. The G-Pod has electrical connections and an alignment key.
Figure 7. G-Shield HMI dashboard cutout. Figure 8. G-Shield Fire HMI enclosure rear view showing VESA 75 mounts. WARNING: The HMI can distract the driver and cause an accident. An accident can cause injury or death to personnel. Version 1...
Use the M25 x 1.5P thread to attach the Sensor Platform to the vehicle. Torque the Mounting Nut to between 12 N m and 20 N m. Gastech recommends finger tight and 3/ 4 of one turn. You can use Loctite® 243™ Threadlocker to make sure the nut does not loosen because of vibration.
G-Shield Instruction Manual 10.3 G-Pod Installation Align the key on the G-Pod with the keyway on the Sensor Platform. Push the G-Pod into the Sensor Platform. NOTE: You will notice some resistance as air is expelled from between the G-Pod and the Sensor Platform.
G-Shield Instruction Manual 11 Electrical Installation Connect the G-Shield Fire to a DC supply voltage of 9 to 30V. The G-Shield Fire can be installed into vehicles with a 12V DC or 24V DC electrical system. WARNING: The G-Shield must be installed by an approved person. Incorrect installation can cause injury or death to personnel.
G-Shield Instruction Manual 11.2 Sensor Platform Connections Label Connection Description VOUT+ Positive supply voltage to Sensor Platform Signal A Signal B GND supply voltage to Sensor Platform Figure 15. Sensor Platform connection details. 11.3 Sensor Platform Termination Resistor RS-485 is a balanced transmission standard. The end of the electrical transmission line must have a termination resistor.
G-Shield Instruction Manual 11.5 Wiring Diagram The G-Shield Fire has two Sensor Platforms. Use a suitable cable to connect the HMI to the first Sensor Platform and use the same specification cable to connect to the second Sensor Platform. Refer to section 11.6 Cable...
G-Shield Instruction Manual 12 HMI Operation The HMI controls the G-Shield. It shows gas level, Sensor Platform status, and alarm indication. The HMI has a capacitive touchscreen interface and uses custom icons and text to give information to the user. Icon Description Icon Description Back button...
G-Shield Instruction Manual 12.1 HMI Power On The vehicles accessory circuit provides power to the HMI. When the vehicles ignition is switched to ACC the HMI will turn on. NOTE: Constant power is supplied to the Sensor Platforms through the VBAT connection on the HMI.
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G-Shield Instruction Manual The G-Shield follows an extended power up sequence when power is first applied to the G-Pods. Power applied to Splash screen Sensor Platforms detected G-Shield waits for G-Pods to stabilize G-Shield is ready for use G-Shield power up completed Figure 23.
G-Shield Instruction Manual 12.2 Information The HMI home screen provides access to important system information. Step 1. Push for three seconds. Step 2. Push to return to the home screen. The information screen shows details of the installed sensors, the HMI firmware version, and the telephone number for tech support.
The HMI gives instant feedback if an incorrect PIN is entered. The input field is automatically cleared and a message is displayed. NOTE: There is no limit to the amount of times an incorrect PIN can be entered. Contact Gastech if you have forgotten the PIN code. 12.5 Change PIN Step 1.
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G-Shield Instruction Manual Step 5. Push to continue. Step 6. Type in the same new PIN code. Step 7. Push to continue. Step 8. The PIN code has been changed. If the PIN codes do not match, the HMI will display this screen. Step 9.
Relay 2 to test it. The energise button toggles the relay between its two states. Step 3. Push to turn Relay 2 off. NOTE: The G-Shield Fire has two relays. Relay 1 is tested in the same way as Relay 2. Version 1...
G-Shield Instruction Manual 12.7 Gas Alarms - Alarm Levels G-Pod alarm levels are factory set and are not adjustable. Warning Alarm Danger Alarm G-Pod Activation Deactivation Activation Deactivation 4.7 P PM 4.0 P PM 10 P PM 9.0 P PM 30 ...
G-Shield Instruction Manual 12.10 Gas Alarms - Danger Alarm Active Figure 28. HCN Danger Alarm On. Figure 29. CO Danger Alarm On Readings: Detected gas level above the DANGER! alarm limit. Relay State: Relay 1 active. Relay 2 active. 12.11 Gas Alarms - Mutable Alarms The HMI has two relay outputs to connect external equipment.
G-Shield Instruction Manual 13 Calibration G-Pods are factory calibrated before dispatch to allow for fast deployment in the field. Calibration must occur at least every six months. G-Pod calibration gas concentrations are factory set and cannot be adjusted. G-Pod calibration adjusts the response of the G-Pod to known concentrations of gas at two points, zero and span.
G-Shield Instruction Manual 13.2 Response Test G-Pods must be response tested when the G-Shield Fire is first commissioned and as necessary during use. Gas is applied to the G-Pod for a fixed time and the response of the G-Pod must be within ± ...
G-Shield Instruction Manual 13.3 HCN G-Pod Response Test Make sure the HCN sensor reads zero before the response test is started. Step 1. Note the current gas readings. Step 2. Connect HCN 10 PPM calibration gas. Turn on the gas. The gas must flow for 3 minutes. Step 3.
G-Shield Instruction Manual 13.4 CO G-Pod Response Test Make sure the CO G-Pod shows zero before the test is started. Step 1. Note the current gas readings. Step 2. Connect CO 100 PPM test gas. Turn on the gas. The gas must flow for 1 minute. Step 3.
G-Shield Instruction Manual 13.5 HCN G-Pod Zero Calibration Access the Settings screen. See section 12.3 Settings. Step 2. Current sensor reading shown. Step 1. Push the button for Sensor 1. Step 3. Connect zero-grade air. Step 4. Turn the gas on. Push Use zero-grade air unless you know the ambient air does not contain HCN.
G-Shield Instruction Manual 13.6 HCN G-Pod Span Calibration Zero calibration must be completed before span calibration. Step 1. Connect HCN 10 P PM calibration gas. Step 2. Turn the gas on. Push Step 3. Span calibration has started. Step 4. Calibration gas detected. Step 5.
G-Shield Instruction Manual 13.7 CO G-Pod Zero Calibration Access the Settings screen. See section 12.3 Settings. Step 1. Push the for sensor 2. Step 2. Current sensor reading shown. Step 3. Connect zero-grade air. Step 4. Turn the gas on. Push NOTE: Use zero-grade air unless you know the ambient air does not contain CO.
G-Shield Instruction Manual 13.8 CO G-Pod Span Calibration Zero calibration must be completed before span calibration. Step 1. Connect CO 100 P PM calibration gas. Step 2. Turn the gas on. Push Step 3. Span calibration has started. Step 4. Calibration gas detected. Step 5.
G-Shield Instruction Manual 13.9 Cancel Calibration NOTE: Cancel will stop the calibration and the previous calibration information will be kept. Step 1. Zero calibration started. Step 2. Zero gas applied. Step 3. Cancel button pressed. Step 4. Calibration cancelled. Push to continue the calibration or to return to the settings screen.
G-Shield Instruction Manual 14 Error Messages Error State Meaning Explanation Solution Sensor state Displayed when the G-Pod is Make sure G-Pod is is not normal in one of two states: in its Normal state before you attempt a Sensor Warmup calibration Sensor Stabilizing Timeout - No...
G-Shield Instruction Manual 15 Specifications Specifications are subject to change without notice. 15.1 Electrical Description Specification VBAT 9 to 30 V DC 9 to 30 V DC HMI Max Power Consumption 2 W Sensor Platform Max Power Consumption < 1 W 5A @250VAC Output Relays 5A @ 30VDC...
G-Shield Instruction Manual 17 Maintenance Make sure the G-Pods are calibrated at least every 6 months. The Splash Guard must be kept clear of debris. You must inspect the Splash Guard regularly. 17.1 Clean the Splash Guard Remove the Splash Guard from the Sensor Platform. Use a brush to remove debris and then wash in potable water.
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