Watlow EZ-ZONE
®
PM Integrated Controller • 117 • Chapter 10 Applications
temperature falls below -40 F/- 40 C, or goes above 320
F/160 C.
When function is set for Vaisala, the PV Function out-
put equals the calculated relative humidity compensat-
ed by the sensor on Analog Input 1.
outputs are disabled when Analog Input 1 temperature
falls below 32 F/0 C, or goes above 212 F/100 C.
When function is set for Wet Bulb/Dry Bulb, the PV
Function output equals calculated humidity. Control
loop 1 will control Analog Input 1 to Closed Loop Set
Point 1. Control loop 2 will control Analog Input 2 to
Closed Loop Set Point 2.
Example 8: Vaisala
Requirements:
Two analog inputs and the enhanced software option
are required and at least two outputs adjusts the con-
trolled temperature and humidity processes.
Overview:
Vaisala Model HMM-30C Solid-state Relative Humid-
ity Sensor is supported with the Vaisala configuration.
Analog Input 1 is used to measure temperature and
Analog Input 2 must be a process input connected to
a Vaisala sensor. The controller provides temperature
compensation for the Vaisala sensor. The humidify and
dehumidify outputs are disabled when Analog Input 1
Wet Bulb/Dry Bulb
Closed Loop
Set Point 2
Closed Loop
Set Point 1
Function
Filter
Source A
Source A
Source A
Source B
Heat Power
Heat Power
Cool Power
Cool Power
0 to 100%
0 to 100%
0 to 100%
0 to 100%
Output
Heat
Heat
Cool
Cool
Output n
Output n
Output n
Output n
Analog Input 1
Analog Input 2
Control Loop 2
Control Loop 1
PV Function
Temperature
Humidity
Vaisala
Closed Loop
Set Point 2
Closed Loop
Set Point 1
Function
Filter
Source A
Source A
Source A
Source B
Heat Power
Heat Power
Cool Power
Cool Power
0 to 100%
0 to 100%
0 to 100%
0 to 100%
Output
Heat
Heat
Cool
Cool
Output n
Output n
Output n
Output n
Analog Input 1
Analog Input 2
Control Loop 2
Control Loop 1
PV Function
Temperature
Humidity
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