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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
111 74-2958—1
Table 31. Sensor Resistance Versus Temperature.
Fig. 54. Graph of Sensor Resistance versus Temperature.
Sensor Type:
T7770B,C 10K ohm setpoint potentiometer
(
Relative
)
Sensor Use:
Offset Setpoint Temperature
Table 32 lists the points for Sensor Resistance versus
Temperature. Fi
g
. 55 shows the
g
raph of these points.
Table 32. Sensor Resistance Versus Temperature.
Fig. 55. Graph of Sensor Resistance versus Temperature.
Sensor Type:
T7770B,C 10 K ohm setpoint potentiometer
(
Absolute
)
Sensor Use:
Direct Setpoint Temperature
Table 33 lists the points for Sensor Resistance versus
Temperature. Fi
g
. 56 shows the
g
raph of these points.
Table 33. Sensor Resistance Versus Temperature.
°F Resistance Ohms
40 9961.09
45 9700.90
50 9440.72
55 9180.53
60 8920.35
65 8660.16
70 8399.98
75 8139.79
80 7879.61
85 7619.42
90 7359.24
95 7099.06
100 6838.87
°F Above and Below Setpoint Resistance Ohms
-9 8877.41
-8 8832.14
-7 8786.87
-6 8741.60
-5 8696.33
TEMPERAT
U
RE
(
DE
G
REE
S)
o
F
30
40 50 60 70
80
90
100
110
0
10
20
30
40
RESISTANCE (OHMS)
20K OHM AT
77
o
F (25
o
C)
80K
70K
60K
50K
40K
30K
20K
10K
o
C
M5874A
-4 8651.06
-3 8605.79
-2 8560.52
-1 8515.25
0 8469.98
1 8424.71
2 8379.45
3 8334.18
4 8288.91
5 8243.64
6 8198.37
7 8153.10
8 8107.83
9 8062.56
°F Resistance Ohms
55 8877.42
60 8741.62
65 8605.82
70 8470.02
75 8334.22
80 8198.42
85 8062.62
°F Above and Below Setpoint Resistance Ohms
8000
8100
8200
8300
8400
8500
8600
8700
8800
8900
9876543210-1-2-3-4-5-6-7-8-9
OHMS
DEGREES F
SENSOR RESISTANCE VERSUS TEMPERATURE
M11609