Honeywell VA201T Calibration Handbook page 80

Calibration Handbook
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.
Minimum and maximum path length entry options for each gas detector are:
Gas Detector Type Minimum Range Maximum Range Step Size
Short Range
Medium Range
Long Range
7. When finished press Enter. Self-test routine is started display shows following message:
When test is successful following message is displayed:
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:
NOTE
a) The overall objective of alignment is to maximize the SIG level. Maximized SIG corresponds to optimal
alignment.
b) 4HE )NSTRUMENT !SSISTED !LIGNMENT )!! SYSTEM ONLY ALLOWS %XCEL TO BE INITIALIZED IF THE 3)' LEVEL IS
GREATER THAN OR EQUAL TO THE 4'4 LEVEL WHEN %NTER IS PRESSED
c) 4HE SMALLEST 4'4 SIGNAL LEVEL THAT IS INITIALLY SET WILL BE EQUIVALENT TO 
for the installation's path length.
d) 4HE 4'4 LEVEL WILL INCREASE GRADUALLY IF THE CURRENT 3)' LEVEL IS LARGER THAN THE 4'4 LEVEL
4HE 4'4 SIGNAL LEVEL ONLY EVER INCREASES )F THE CURRENT 3)' LEVEL FALLS BELOW THE 4'4 LEVEL 4'4 WILL
remain at its previous highest value. In order to initialize the gas detector the SIG level must be brought
back above the TGT level.
Calibrate

Install
System Type

Shrt Range
Path Length

23
4m / 16ft 40m / 131ft
20m / 66ft 120m / 394ft
20m / 66ft 200m / 656ft
Self Test

Please Wait
Checks Passed
SIG:
TGT:
80
1m / 3ft
1m / 3ft
1m / 3ft
 OF THE SIGNAL EXPECTED
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