Honeywell Gassing Test Cell User Guide

Table of Contents

Honeywell Gassing Test Cell User Guide

The gassing test cell allows the Searchline Excel™ Plus and Searchline Excel™ Edge calibration to be checked using a user-specified gas concentration, as an alternative to the standardfunctional test filters

CAUTION

Prerequisite for calibration check using the gassing test cell is installation of the Honeywell Fixed Platform App to a suitable handheld device.The test gas must be the same as the gas calibration of the Searchline Excel Plus or Searchline Excel Edge units and ideally the concentration should be between 2 and 5 LEL.m, never below 1 LEL.m.

Note

For Universal Calibration units any of Methane, Ethane, Propane, Butane, Ethylene can be used. Natural gas mixes can also be tested

Note

Cross-calibration is not recommended. Typical values for crosssensitivity are not sufficiently precise to enable valid calibration checks using the gassing test cell. Response tests can easily beperformed with the functional test filters. Refer to the Technical Manual for more information

WARNING

Take necessary precautions to ensure safety when dealing with high concentration gasses.The gassing test cell supplied by Honeywell Analytics (Part No: 2017B0185) is 17 cm (0.55 ft) long and weighs 958 g (2.11 lb).The following table outlines the response expected when using this gassing test cell:

* Pentane cannot be used with the gassing test cell. At normal temperatures, this substance does not vaporise sufficiently to give a useful signal in the short path of the gassing test cell.

Gas type	LEL of the gas	Concentration applied	Calculated response with 17 cm gas test cell	4-20 mA output
Methane	4.4 % v/v	65 %v/v	2.5 LEL.m	12.0 mA
Ethane	2.4 % v/v	35 %v/v	2.5 LEL.m	12.0 mA
Propane	1.7 % v/v	25 %v/v	2.5 LEL.m	12.0 mA
Butane	1.4 % v/v	20 %v/v	2.5 LEL.m	12.0 mA
Pentane*	1.1 % v/v	16 %v/v	2.5 LEL.m	12.0 mA
Ethylene	2.3 % v/v	34 % v/v	2.5 LEL.m	12.0 mA
Propylene	2.0 % v/v	30 % v/v	2.5 LEL.m	12.0 mA

WARNING

These gases are flammable and some are toxic.Take appropriate precautions when handling.

CONNECT THE GASSING TEST CELL

Connect the gassing test cell to the receiver. Ensure the locking tab clicks into the right position.
Rotate the handle clockwise to lock the gassing test cell onto the receiver.
Zero the receiver with the empty gassing test cell.
Apply the test gas to the gassing test cell. Avoid pressurising the test cell. Wait for the receiver output to stabilise.
Check if the receiver output is as indicated in the table above, ±5% FSD.
Remove the test gas from the gassing test cell.
Remove the gassing test cell.
Re-zero the receiver.