System Controller Calibration - Honeywell Searchline Excel Cross-Duct Technical Handbook

MAN0889_Issue 3_03/13
3. Installation and Operation

3.7 System Controller Calibration

This procedure is used to set up the system controller using the Searchline Excel Cross-Duct gas detector.
A chosen fixed output signal is sent from the gas detector to the system controller allowing calibration of
the 0 - 100% scale of the controller without having to use gas. The steps use procedures described in the
previous section.
To calibrate the controller carry out the following procedure:
(1) Connect the Interrogator to the gas detector.
See Connecting the Interrogator to Searchline Excel Cross-Duct Gas Detector.
(2) Turn on the Interrogator.
See Powering Up.
(3) Select Calibrate from the main menu.
Press the up and down keys on the keypad to navigate through the menu options.
(4) Press Enter on the Interrogator keypad and the Calibrate menu is displayed.
(5) Select Force 4-20 from the Calibrate menu.
(6) Press Enter on the keypad and a display similar to the following appears:
(7) Use the up and down keys on the keypad to set the displayed output current to the desired value.
The values can be changed in steps of 0.1mA in the range 1mA to 21mA.
(8) Press Enter on the keypad.
This selects the currently displayed value and forces the gas detector to output that current. Once complete
a display similar to the following appears:
(9) Carry out checks on the controller by following the instructions in the controller documentation.
(10) When checks are complete press
(11) Press Enter on the keypad.
The following message is displayed:
The fixed output is released and the gas detector returns to normal operation.
4-20 current
4.5 mA
Fixed 4-20 mA
Press Enter v
on the Interrogator keypad and the following display appears:
Press Enter to
Release 4-20 v
4-20 Released
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Searchline Excel Cross-Duct Technical Handbook
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