AGS TFT Gas Detector User Guide
- July 22, 2024
- AGS
Table of Contents
AGS TFT Gas Detector
SPAN CALIBRATION GUIDE
Regular maintenance and calibration of the sensors by trained technicians is
recommended. Inspections and services must be documented and executed at
regular intervals. The frequency must be determined and observed by the person
responsible for the gas warning system according to all regulatory, code and
legal requirements. The inspection interval is normally 12-18 months to retain
optimum safety.
Safety Statements
- Acknowledge any alarms or faults before attempting to begin the calibration process.
- When entering span adjustment function, the detector will enter special mode, and will remain offline until the adjustment is successful, or power is reset.
- At elevations higher than 6,560’ (2,000m), calibration will result in a lower reading.
- Response and recovery times may vary with when performed outside the parameters of factory calibration i.e., temperature, air velocity and flow rate.
- Give at least seven (7) minutes between testing the same unit or until gas has fully dispersed.
- Sensors should be calibrated if the measuring range has been exceeded, which can shorten the sensor lifetime and/or reduce its sensitivity.
Span Calibration Test Gases
- All calibration test gases are classified as non-flammable and non-toxic, however, they do contain gas under pressure and may explode if heated and cause asphyxiation in very high concentrations.
- AGS gas mixtures are prepared using equipment traceable to N.P.L / ISO standards.
- Cylinders should always be stored in the vertical position and secured to prevent them falling over.
- Ensure valve/regulators are screwed and secured tight before use and ensure valves are closed after use.
- Safety Data Sheets are available on request.
Target Gas
Carbon Monoxide
| Formula
C0
| Concentration
120ppm
| Balance/Mix
Air
| Flow Rate
0.5L
Per/Min
| F/C
59-86°F
15-30°C
| Application Time
<60s
---|---|---|---|---|---|---
Natural Gas/Methane| NG / CH4| 0.5% BV (10% LEL)| <120s
Propane (LPG)| C3H8| 0.2% BV (10% LEL)
Hydrogen| H2| 0.4% BV (10% LEL)
Nitrogen Dioxide| N02| 2ppm
0xygen| 02| Fresh Air (20.9% V/V)| Nitrogen
All persons required to handle gas should be able to identify the following: –
- The cylinder and its contents.
- Properties and hazards of the gases.
- The ‘use by’ date and unique batch number.
Procedure
Equipment : 1x M3 Socket Wrench / 1x Tweezers or metal jumper / 1x Calibration Kit
Preparation
Fix any regulators, pipes, and mask to gas cylinder.
Unscrew the four bolts of the device using an M3 socket wrench.
Carefully remove the front fascia to expose the circuit board.
Prompt Calibration
Short out the [Cal1] header for ~10 seconds.
The device is now in Span Calibration Mode.
Apply Span Calibration Gas
Open valve (before applying the mask) to allow for pressure release.
Hold mask over the gas sensor and apply gas.
Apply gas until ‘SUCCESSFUL’ message appears on screen.
Calibration Complete. The device will automatically return to normal operation. Remove mask, turn off gas and secure front fascia with M4 bolts.
Calibration Fail.
If calibration results in a ‘‘failure’’ message, repeat process ensuring
all parameters are met. If unsuccessful, contact your supplier.
American Gas Safety LLC – 6304 Benjamin Road, Suite 502, Tampa FL 33634 www.americangassafety.com