APG PT-L1-C user manual - Manual (Page 5)

Rev. A3,10/08 PT-L1-C
5
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C. Re-check zero and re-adjust the zero (“Z”) pot if required.
D. Repeat steps B, and C, until no further adjustment is required.
3. 4-20 mA Transmitter Information
This device is a 2 wire, loop powered transducer/transmitter. A voltage of
between 9 and 32 VDC must be maintained at this connection. Completion of the
earth or system ground is recommended for proper circuit protection.
Power supply voltage must be sufficient to maintain a minimum of 9 VDC at
the transducer/transmitter terminals after “dropping” voltage across RL at full
scale current (20 mA), see Figure below.. Example: If RL = 250 ohm then “drop”
is 0.02 Amps X 250 ohm = 5 volts. Therefore power supply minimum is 5 V + 9 V
= 14 V