Eliwell FREE Panel EVP 3300/C, Installation Manual

Page: 9 / 39

FREE Panel
9/38
3.3 Analogue inputs
Inputs can be configured as specified in the table below.
Values
Parameter Description
0 1 2 3 4 5
Cfg_AI1
Type of input
analogue
AI1
NTC
probe
(NK103)
Probe
configured
as voltage-
free digital
input
NTC
probe
(103AT-2)
- - -
Cfg_AI2
Type of input
analogue
AI2
NTC
probe
(NK103)
Probe
configured
as voltage-
free digital
input
NTC
probe
(103AT-2)
- - -
Cfg_AI3
Type of input
analogue
AI3
- - -
4-20
mA
0-10
V
0-5 V
Parameter Range Description
FullScaleMin_AI3 -9999…+9999 Analogue input AI3 start of scale value
FullScaleMax_AI3 -9999…+9999 Analogue input AI3 full scale value
The temperature and humidity measurement, as well as the corresponding precisions and tolerances, refer to the
application point of the probes inside the instruments.
If these same measurements are to be referred to air conditions outside of the instrument, e.g. ambient measurements,
account must be taken of offset (differential) parameters that depend on the installation and usage conditions of the
instrument itself.
The differentials e.g. Calibration parameters that can be set are
for on-board (built-in) sensors, 'compensation' parameters are also available
Factory values
for these
offsets assume
a typical
installation with wall mounted backplate in a non-ventilated environment and with the display backlighting mainly OFF. In
these conditions the following calibration values are obtained:
Compensation_AI1 = -12.0 °C
Compensation_AI4 = -10.5 °C
If the usage conditions require the backlight to be mainly ON, the values must be modified as follows:
Compensation_AI1 = -15.0 °C
Compensation_AI4 = -13.0 °C
For other mounting conditions, it is advisable to carry out calibration during installation, checking the temperature and
relative humidity differences between the external air and the internal probes and if necessary correcting the parameters
Compensation_AI1/ Compensation_AI4
In any case it is possible to achieve a precision of +- 1°C on the temperature measurement and +- 3%RH on the relative
humidity measurement.
Parameter Description Unit of Measure range
Calibration_AI1 Analogue input AI1 differential °C/10 or °F/10 -180 ... 180
Calibration_AI2 Analogue input AI2 differential °C/10 or °F/10 -180 ... 180
Calibration_AI3 Analogue input AI3 differential -1000 ... 1000
Calibration_AI4 Analogue input AI4 differential -1000 ... 1000
Parameter Description Unit of Measure range
Compensation_AI1
Internal compensation AI1
difference between external air
temperature and measurement
read by NTC sensor AI1
°C/10 or °F/10 -1000 ... 1000
Compensation_AI4
Internal compensation AI4
difference between external
temperature and T measurement
read by RH sensor AI4 (this
temperature is used to calculate
the relative humidity based on
psychrometric charts)
°C/10 or °F/10 -1000 ... 1000