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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—1114
Fig. 60. Partial psychometric chart for a C7400A Solid State Enthalpy Sensor.
See Fi
g
. 61 for a C7400A Solid State Enthalp
y
Sensor output
current vs. relative humidit
y
.
Fig. 61. C7400A Solid State Enthalpy Sensor output
current vs. relative humidity.
Sensor Type:
T7242 or e
q
uivalent
CONTROL
CURVE
A
B
C
D
CONTROL POINT
APPROX.
°
F (
°
C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46
90
100
80
70
60
50
40
30
20
10
ENTHALPY
—BTU PER POUND DRY AIR
85
(29)
90
(32)
95
(35)
100
(38)
105
(41)
110
(43)
35
(2)
35
(2)
40
(4)
40
(4)
105
(41)
110
(43)
45
(7)
45
(7)
50
(10)
50
(10)
55
(13)
55
(13)
60
(16)
60
(16)
65
(18)
65
(18)
70
(21)
70
(21)
75
(24)
75
(24)
80
(27)
80
(27)
85
(29)
90
(32)
95
(35)
100
(38)
APPROXIMATE DRY BULB TEMPERATURE—
°
F (
°
C)
A
A
B
B
C
C
D
D
M11160
RELATIVE HUMIDITY (%)
1
1
HIGH LIMIT CURVE FOR W6210D,W7210D.
20
10
30
40
50
60
70
80
90
100
605040 70 80 90 100
PERCENT RH
TEMPERATURE °F (°C)
M11605
C7400A OUTPUT CURRENT
4 m
A
6 mA
8 mA
10 mA
20 mA
18 mA
16 mA
14 mA
12 m
A
(4) (10) (16) (21) (27) (32) (38)
DC
BA
D = 17 MA
C = 15.5 MA
B = 13.5 MA
A = 11 MA