Wiring For 5-Terminal Board; Wiring For 3 Wire Pulse Output; Wiring For 2 Wire Hart@4~20Ma - Bell VFM60 Series User Introduction Manual

3.1 Wiring for 5-terminal board

3.1.1 Wiring for 3 wire pulse output

3-wire pulse output require a power source of 13.5~42VDC. VFM use a current pulse output with
50% duty ratio. If the pulse reciving instrument require voltate pulse, please add a resistor between
" " and "V-", the resistance should be within 500ohms~1000ohms, and power consumption should
be no less than 0.5W.
Please reference to picture 3.3 picture below for 3-wire pulse output wiring

3.1.2 Wiring for 2 wire HART@4~20mA

When there is not temperate and pressure compensation and the power source is 24VDC, the max
load for 4~20mA analog is 500ohms. And when there is temperate and pressure compensation and
the power source is 24VDC, the max load for 4~20mA analog is 400ohms. When using a HART
communicater, please add a 250ohms load resistor
Date:24/04/2020
Picture 3.3: 3-wire pulse output wiring
Picture 3.4 Wiring for 2 wire HART@4~20mA
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VFM-60
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User's Manual