CPC 485 - Software Setup; Input Board and Point Configuration; Sensor Control Setup; Maintenance

20 • Dew Cell Dew Point Probe (P/N 203-1902) 026-1701 Rev 0 01-05-98
Software Setup
Input Board and Point Configuration
Set up the Dew Cell Dew Point Probe by assigning the
board and point address to the appropriate input. Refer to
the REFLECS Installation and Operation manual for more
information.
Sensor Control Setup
If the Dew Cell Dew Point Probe is being set up in Sen-
sor Control, the Sensor type must be defined as (D)ewpoint
in the Sensor Setup screen. In some older versions of RE-
FLECS software, the (D)ewpoint option will not be avail-
able; in this case, set the sensor up as a (L)inear sensor with
a Gain of -58.4 and an Offset of -1523.
Maintenance
The dew point probe uses a heated salt dewcell. There-
fore, it requires regular maintenance. The probe should be
inspected every 3-6 months. Remove the outer sleeve of the
probe and inspect the wick area. If it is dirty or if it has a
build-up of salt crystals, the probe needs to be cleaned and
recoated. To clean the probe, immerse it in a clean contain-
er of boiling distilled or de-ionized water for 10 minutes,
empty the water and replace with fresh water and repeat.
Once the probe is clean, it can be recoated with the a couple
of drops of a solution of 5 parts distilled water to 1 part
Lithium Chloride crystals on a weight basis. This solution
can be made or it can be ordered through CPC (P/N 203-
1925).
Figure 16-Dew Cell Dew Point Probe Wiring
23456781
ON
123
45
6
7
8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
5
V
12
V
5
V
5
V
5
V
12
V
12
V
12
V
S1
S2
INPUT
1
INPUT
9
INPUT
2
INPUT
10
INPUT
3
INPUT
11
INPUT
4
INPUT
12
INPUT
5
INPUT
13
INPUT
6
INPUT
14
INPUT
7
INPUT
15
INPUT
8
INPUT
16
23456781
ON
S3 NETWORK
POWER
AC1 0V AC2
+485
0V
-485
NET
16AI
2345678
1
ON
GREEN WHITE
BLACK RED
26513079