Environmental Monitoring System (EMS-01) Instruction Manual
19
4.2
Sensitivity Adjustment
A small flat-head screwdriver should be used to set potentiometer sensitivity. A
digital multi-
meter (DMM)
is also required to measure sensitivity settings during adjustment.
The unit sensitivity trimmer provides a means to control the set point at which alarms occur. This can be
adjusted to
prevent false triggering
and manage
temporary rises in humidity
.
There are
5 levels
of sensitivity:
Level Volts ADC Setting
Notes
5
0.7
213
Maximum
Sensor resistance up to approximately
30K
.
4
1.4
437
The full-scale dial angle is approximately
220 Degrees
(maximum to minimum);
levels are approximately
55 degrees
apart. Adjust
clockwise (CW) to increase
sensitivity
, and
counter-clockwise (CCW) to decrease sensitivity
.
3
2.1
658
2
2.8
869
1
3.29
1023
Minimum
Sensor resistance at approximately
10K.
Table 4:
EMS-01 Sensitivity Levels
Adjust the sensitivity of EMS sensors as follows:
1.
Ensure the unit is
powered on
.
2.
Attach a
digital multi-meter (DMM)
to the
Sensitivity Measure
terminals
( ).
This is to measure sensitivity as it is being
adjusted.
3.
Insert a
small flat-head screwdriver
into
the
Sensitivity Trimmer
until it contacts
the bottom. Some resistance should be felt
as the tool is turned to adjust sensitivity.
4.
Table 4
(above) provides sensitivity
measurements. Turn the small flat-head
screwdriver:
a.
Clockwise (CW) to increase
sensitivity, or
b.
Counter-clockwise (CCW) to
decrease sensitivity.
5.
Once the procedure is complete, remove
the digital multi-meter and small flat-head
screwdriver from the unit.
