9
RELATIVE HUMIDITY (% RH) PARAMETERS
The PAGE-11 lists Alarm and Control related parameters for %RH (Wet-Bulb). The Table 5.1 below describes each parameter.
Table 5.1
0 to 1000 Seconds
(Default : 100)
(Default : 10.0)
0.1 to 999.9%
Parameter Description
Settings
(Default Value)
0.3 to 25.0%
(Default : 2.0)
0.2 to 10.0%
(Default : 2.0)
ALARM-2 HYSTERESIS
Sets differential (dead) band between ON and OFF states of
Alarm-1.
ALARM-2 BAND
Sets symmetrical positive and negative deviation (offset) limits
from %RH control setpoint for both High and Low Alarm-2
activation.
Example:
If Band = 2.0 % RH, then
High Alarm Limit = SP + 2.0 % RH
Low Alarm Limit = SP - 2.0 % RH
PROPORTIONAL BAND
Sets proportional gain (% power per unit error) for %RH control
loop. Defined in same units and resolution as that for PV.
INTEGRAL TIME
Sets integral time constant in seconds for %RH control loop.
Setting the value to 0, cuts-off the integral action.
(Default : 25)
0 to 250 Seconds
(Default : 1.0)
0.5 to 25.0 Seconds
(in steps of 0.5 secs.)
CYCLE TIME
Sets the total ‘On + Off’ time in seconds for time proportional
power output for %RH control loop through Output-2.
DERIVATIVE TIME
Sets derivative time constant in seconds for %RH control loop.
Setting the value to 0, cuts-off the derivative action.
User Manual
HumiTherm-c (Dry-Wet)
Section 5
