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• Simplified mode:
• Complete mode:
Toggling between the two modes is made by means of a rotary selector placed on the
instrument electric board, between the terminal board and the mini-USB connector.
The selector has ten numbered positions ranging from 0 to 9.
If the selector is in position 0 (default setting), we are in complete mode and the
instrument operates with thresholds and hysteresis set via software (see Tab. 4.B for
factory settings).
Tab. 4.B: Relay output default settings in HD45 models
Temperature (HD45 17...R and HD45 7B...R)
Threshold = 100.0 °C
Hysteresis = 5.0 °C
If the selector is in a position other than zero, we are in simplified mode: the relay
activates only on the threshold set with the rotary selector.
If the selector is associated with the CO
threshold value according to the table below:
Tab. 4.C: CO
POSITION
If the selector in a position other than zero, hysteresis is preset to 100 ppm.
Hysteresis and intervention mode can be changed via software (see section
the relay functions with a single threshold, that can be selected
from a series of fixed values via a rotary switch.
the relay may function with one or two thresholds that can be
freely set via a PC.
Fig. 4.C: Rotary selector position
threshold rotary selector
2
CO
0
1
2
3
4
5
6
7
8
9
measurement, each position corresponds to a
2
RELAY THRESHOLD (ppm)
2
Rotary selector disabled
600
800
900
1000
1200
1400
1600
1800
2000
- 14 -
Mini-USB
connector
Rotary
switch
Terminal board
CO
(HD45 B...R)
2
Threshold = 1000 ppm
Hysteresis = 100 ppm
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