4-20 Ma Wiring - Honeywell SPM Flex User Manual

SPM Flex Gas Detector

4-20 mA wiring

4-20 mA output is a three-wire connection that is configurable as sink, source, or
isolated, as shown in these following figures� Use an Allen wrench to remove the
wiring cover for access to the terminals� There must be a 200-600-ohm load on
the 4-20 mA line�
To ensure adequate resolution to overcome tolerance in the 4-20 mA reading, set
the full scale at an appropriate level� The SPM Flex issues a fault if the measured
4-20 mA reading is more than 0�8 mA (5% full scale) off from the expected drive
value�
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Figure 12. 4-20 mA sink configuration
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Figure 13. 4-20 mA source configuration
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Figure 14. 4-20 mA isolated configuration
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