PPI HumiTherm-c Series - Page 39

37
2.6
X (0 - 1.0)
Range Low =
100.0
2.6
X (5 - 1.0)
Range High =
100.0
= 38.5
= 153.8
Span
X (0 - Signal Low)
Range Low =
100.0
Span
X (5 - Signal Low)
Range High =
100.0
User Manual
HumiTherm-c (Temp+RH)
%RH LOW AND %RH HIGH
The controller is calibrated for 0 to 5 VDC input for % RH. The transmitter output signal, however, may be any voltage between
0 to 5 VDC (for e.g. 0 to 1 VDC, 1 to 3.6 VDC, 0 to 3.3 VDC etc.). The value for ‘Range Low’ and ‘Range High’ parameters must
be corresponding to 0 and 5 VDC only. For this, use the following formulae for computing the ‘Range Low’ and ‘Range High’
values.
(where; Span = Signal High - Signal Low)
Example 1
Signal Low = 0 VDC, Signal High = 1.0 VDC
Here, Span = 1.0 - 0 = 1.0 VDC
Example 2
Signal Low = 0 VDC, Signal High = 3.3 VDC
Here, Span = 3.3 - 0 = 3.3 VDC
Example 3
Signal Low = 1.0 VDC, Signal High = 3.6 VDC
Here, Span = 3.6 - 1.0 = 2.6 VDC
1.0
X (0 - 0)
Range Low =
100.0
1.0
X (5 - 0)
Range High =
100.0
= 0.0
= 500.0
3.3
X (0 - 0)
Range Low =
100.0
3.3
X (5 - 0)
Range High =
100.0
= 0.0
= 151.5