User manual for Digital Indicator and cooperating software
This is a class A unit. In housing or a similar area it can cause radio
frequency interference. In such cases the user can be requested to use
appropriate preventive measures.
Carefully check that the insulation used with the unit (Fig. 3.1) meets the
expectations and if necessary use appropriate measures of overvoltage protection.
Additionally, assure the maintenance of appropriate installation air and surface
insulation gaps (Tab. 3.1).
Range of operating voltage
Air gap [mm]
Surface gap [mm]
Up to 50V RMS or DC
0,2
1,2
Up to 100V RMS or DC
0,2
1,4
Up to 150V RMS or DC
0,5
1,6
Up to 300V RMS or DC
1,5
3,0
Tab. 3.1. Minimal insulation gaps according to EN 61010-1
Fig. 3.1. Schematic diagram showing the insulation between individual circuits of the unit.
7
Internal circuits
relay 2
relay 1
External sensor
supply output
Measurement inputs
RS 485
interface
Insulation strength 1min @ 2300V AC
Insulation strength 1min @ 1350V AC
Insulation strength 1min @ 500V AC
No insulation
Relay circuits
Power supply
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