Honeywell VA201T - Path Length Entry and Self-Test; Signal Level Objective and Optimization

Calibration Handbook
80 Searchline Excel
Calibrate
Install
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System Type
Shrt Range
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The second line shows the current gas detector type: Short Range 5 - 40m (15 - 130ft), Medium
Range 20 - 120m (65 - 390ft) or Long Range 20 - 200m (65 - 650ft)
6. Press
, the Current Path Length in meters is displayed. Verify actual path distance (in meters)
between transmitter and receiver.
Path Length
23
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Minimum and maximum path length entry options for each gas detector are:
Gas Detector Type Minimum Range Maximum Range Step Size
Short Range 4m / 16ft 40m / 131ft 1m / 3ft
Medium Range 20m / 66ft 120m / 394ft 1m / 3ft
Long Range 20m / 66ft 200m / 656ft 1m / 3ft
7. When finished press Enter. Self-test routine is started display shows following message:
Self Test
Please Wait
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When test is successful following message is displayed:
Checks Passed
The screen then changes to show a display similar to the following.
The first line of the display shows the magnitude of the current signal level as a horizontal bar graph - SIG:
The second line of the display shows the magnitude of the current target signal level as a horizontal bar
graph - TGT:
SIG:
TGT:
NOTE
a) The overall objective of alignment is to maximize the SIG level. Maximized SIG corresponds to optimal
alignment.
b) 

c) 
for the installation’s path length.
d) 

remain at its previous highest value. In order to initialize the gas detector the SIG level must be brought
back above the TGT level.