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g. To increase the loop current in steps of 0.025 mA , toggle the Switch - 2 to Up and
Down . Each Toggle will increase loop current by 0.025mA
h. To decrease the loop current in steps of 0.025 mA , toggle the Switch - 3 to Up and
Down . Each Toggle will decrease loop current by 0.025mA
i. Ensure current reading is equal to 20.00 mA.
j. Turn Off Swithc-4 and wait for a second
k. Turn off the Power.
Now the new calibration values registered in the non-volatile memory.
Note2: Set the Switch with respect to probe connected to the instrument before put into
service.
ii. Testing loop output zero (4mA) and span (20mA)
The MS2601E Probe Selection Switches (page 9) offer three test settings that allow the unit to be
placed into various diagnostic modes as follows:
1) 4mA Output – Forces a constant 4mA output on the current loop.
2) 20mA Output – Forces a constant 20mA output on the current loop.
3) 4-20mA Sweep – Causes the output to continually cycle from 4mA up to 20mA.
These test modes can be useful when troubleshooting problems with the current loop wiring and
DCS/SCADA system.
iii. Testing the MS2601E with the Meter Prover
A Meter Prover is provided to allow routine checks of the MS2601E. The Meter Prover simulates a
Wire Loop type probe at a fixed value. To test the MS2601E with the Meter Prover:
1) Disconnect power.
2) Disconnect the MS2601E from the probe (or if the MS2601E is remote-mounted, disconnect
the probe extension cable from the probe.)
3) Connect the Meter Prover to the MS2601E probe connector stem (or to the probe extension
cable if the MS2601E is remote-mounted.)
4) Loosen the MS2601E Enclosure Lock Screw.
5) Unthread and remove the MS2601E cover.
6) Change the Probe Selection Switches to the Wire Loop position (see page 9.)
7) Reconnect power and allow the instrument to measure for several minutes to stabilize.
8) After several minutes observe the transmitter output. The output should closely match the
value printed on the Meter Prover label.
If the transmitter output matches the Meter Prover value, you may return the Probe Selection
Switches to their previous setting and reconnect the MS2601E to the probe. If the transmitter output
shows a significant difference compared to the Meter Prover value, further troubleshooting may be
required. Refer to page 14 for troubleshooting or contact the factory for further assistance.
Be sure to reinstall the enclosure cover and tighten the Lock Screw when putting the MS2601E back
into service.
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