Honeywell Design and Application - Page 177

Section 13 - Checkout
171 Honeywell Economizers 63-8594-02
NOTE: The accuracy of the sensors used to measure the temperature and humidity of the
environment needs to be considered. If you are close to the measurements your C7400
sensor is probably working.
S
O
Vdc measured between SO and GND
<90% RH
mA curve 4 6 8 10 12 14 16 18 20
Low (-.3 Vdc) 0.672 1.158 1.644 2.13 2.616 3.102 3.588 4.074 4.56
Nominal 0.972 1.458 1.944 2.43 2.916 3.402 3.888 4.374 4.86
High (+.3 Vdc) 1.272 1.758 2.244 2.73 3.216 3.702 4.188 4.674 5.16
> 90% RH
mA curve 4 6 8 10 12 14 16 18 20
Low (-.4 Vdc) 0.572 1.058 1.544 2.03 2.516 3.002 3.488 3.974 4.46
Nominal 0.972 1.458 1.944 2.43 2.916 3.402 3.888 4.374 4.86
High (+.4 Vdc) 1.372 1.858 2.344 2.83 3.316 3.802 4.288 4.774 5.26
S
R
Vdc measured between Sr and GND
<90% RH
mA curve 4 6 8 10 12 14 16 18 20
Low (-.3 Vdc) 0.72 1.23 1.74 2.25 2.76 3.27 3.78 4.29 4.8
Nominal 1.02 1.53 2.04 2.55 3.06 3.57 4.08 4.59 5.1
High (+.3 Vdc) 1.32 1.83 2.34 2.85 3.36 3.87 4.38 4.89 5.4
> 90% RH
mA curve 4 6 8 10 12 14 16 18 20
Low (-.4 Vdc) 0.62 1.13 1.64 2.15 2.66 3.17 3.68 4.19 4.7
Nominal 1.02 1.53 2.04 2.55 3.06 3.57 4.08 4.59 5.1
High (+.4 Vdc) 1.42 1.93 2.44 2.95 3.46 3.97 4.48 4.99 5.5