Honeywell C7189A - Manual (Page 4)

69-0895—1 4
C7189A WALL MOUNT TEMPERATURE SENSOR
Home and Building Control
Honeywell Limited-Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9
QUALITY IS KEY
Helping You Control Your World
69-0895—1 J.H. Rev. 5-95 Printed in Mexico
CHECKOUT
Allow the C7189 Wall Mount Temperature Sensor to soak
in the air moving through the room for a minimum of five
minutes before taking a resistance measurement.
With an accurate thermometer (
±
1
°
F [0.5
°
C]), measure the
temperature at the sensor location, allowing time for the
thermometer to stabilize before reading. Remove one wire
from one of the C7189 wiring terminals. Use an ohmmeter
to measure the resistance across the sensor. Then verify
sensor accuracy with the temperature/resistance curve of
Fig. 3.
CALIBRATION
The C7189 Remote Sensor is calibrated at the factory and
cannot be recalibrated in the field.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive
Golden Valley, MN 55422
Fig. 3. C7189 Sensor Resistance vs. Temperature Performance Characteristics.
OHM RESISTANCE
°F
(°C )
M6357
RESISTANCE DECREASES 18.6 OHMS PER 1°F
CHANGE OR 33.4 OHMS PER 1°C CHANGE. 1
1
2000
2100
1900
1500
1600
1700
1800
1400
TEMPERATURE
40
(4)
50
(10)
60
(16)
70
(21)
80
(27)
90
(32)
100
(38)
1300
1000
1200
2200
2300
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
7.8
8.9
10.0
11.1
12.2
13.3
14.4
15.6
16.7
17.8
18.9
20.0
21.1
22.2
23.3
24.4
25.6
26.7
27.8
28.9
30.0
31.1
32.2
33.3
34.4
35.6
36.7
37.8
2131 to 2094
2094 to 2057
2057 to 2019
2019 to 1982
1982 to 1945
1945 to 1908
1908 to 1871
1871 to 1833
1833 to 1796
1796 to 1759
1759 to 1722
1722 to 1685
1685 to 1647
1647 to 1610
1610 to 1573
1573 to 1536
1536 to 1499
1499 to 1461
1461 to 1424
1424 to 1387
1387 to 1350
1350 to 1313
1313 to 1275
1275 to 1238
1238 to 1201
1201 to 1164
1164 to 1127
1127 to 1089
ROOM TEMPERATURE OHMS OF
RESISTANCE
°F °C