Det-Tronics PW9200x Pathwatch IR Gas Detection System - Manual (Page 7)

5 95-8400
Align
A shorter response time (approximately 2 seconds) is
used only during the alignment and testing process.
Operate
A longer response time (approximately 20 seconds) is
used during normal operation to compensate for short
term signal variations and to prevent the hydrocarbon
alarm from activating on short duration vapor clouds.
Test
Test mode activates the hydrocarbon alarm circuits.
CALIBRATION ADJUSTMENT POTENTIOMETER
The CALIBRATION ADJUSTMENT potentiometer is
used to scale the RATIO output voltage for the
desired span. During factory calibration, the RATIO
output voltage is set to correspond to the desired
ppm reading at full scale.
SENSITIVITY SWITCH
The SENSITIVITY selector permits adjustment of the
range or span of the instrument’s sensitivity. It is rec-
ommended that the selector be set for Hi. Mid and Lo
are used for specialized applications.
ZERO
OUTPUT
OPERATE
ALIGN
TEST
O
V
mA
LO
MID
HI
CALIBRATION
ADJUSTMENT
SET-
POINT
RATIO DENOM NUM
MODE
SENSITIVITY
VAPOR ALARM OUTPUT
SIG GND OUT OPT
OUTPUT
SELECT
A1395
SPARE
FUSE
1 A
FUSE 1 A
ADJUST
Figure 2—Front Panel Controls