4
TEMPERATURE-ONLY MODE
The controller can be configured to operate in Temperature-only mode by setting the %RH SP value to 0. In this mode, the
controller controls only the Dry Bulb Temperature at the set value through Heater Control Output-1. The %RH Control Output-
2 is kept off. The Lower Readout in this case can be selected to either display the %RH value (If Wt Bulb RTD sensor is
connected) or the Temperature Unit °C. The parameter (Lower Readout Indication) can be set to ( % R H
indication) or (°C Indication). This selection is available only if %RH SP value is set to 0.
TUNE INDICATION
Upon issuing TUNE command, the controller starts tuning itself to the process under control. While the controller is executing
Tuning operation, the front panel indicator TUN flashes. The user is advised not to disturb the process or alter any parameter
values while the tuning is in progress. The TUN indicator automatically turns OFF upon completion of Tuning Procedure. The
controller reverts to the MAIN Display Mode and starts maintaining the Temperature and RH values (PV) at their respective
Setpoints.
PV ERROR INDICATIONS
The controller indicates the PV error messages for both Temperature and RH Values on Upper and Lower Readout,
respectively, in the following conditions.
Error Indication for Dry Bulb Temperature (Upper Readout)
Figure 2.2
Table 2.1
Message
Over-range
(Dry-Bulb Temp. above Max. Range)
Under-range
(Dry-Bulb Temp. below Min. Range)
Open (Sensor open / broken)
PV Error Type
Error Indication for Relative Humidity (RH) (Lower Readout)
Figure 2.3
Table 2.2
Either Dry Bulb Temp. is below -20.0°C or
above 162.0°C. The error may also occur if
Wet Bulb depression is more then 60.0°C.
Message
Over-range
(Wet-Bulb Temp. above Max. Range)
Under-range
(Wet-Bulb Temp. below Min. Range)
Open (Sensor open / broken)
PV Error Type
User Manual
HumiTherm-c (Dry-Wet)
PPI
HumiTherm-c
AL1 TUN
AL2
1
2
°C
%RH
PPI
HumiTherm-c
AL1 TUN
AL2
1
2
°C
%RH
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