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15
FOR HI 8615L ONLY
The
HI 8615L
are factory calibrated, and the displayed values are
referenced to the 4-20 mA loop current. Under normal application,
adjustment on this module may not be necessary. If routine check is
required, the following procedures shall be performed.
• Follow the above procedure for
HI 8615
(see page 13).
• Simulate a 12.00 mA loop current for the transmitter (i.e. 0 mV
at Electrode input) and check display reading.
• Simulate a 20.00 mA loop current for the transmitter (e.g.
+1000 mV for
HI 8615L
at Electrode input) and check display
reading.
• Connect the ORP electrode to the module and immerse the tip of
the electrode into the beaker of
HI 7020
ORP solution and check
that the ammeter reading lies between 13.6 and 14.2 mA for
HI 8615
, or the instrument reading is between 200 and 275mV
at 25 °C (
HI 8615L
only).
• Only if the reading lies outside this
range, adjust the slope adjustment
trimmer on the transmitter to reflect
a reading within this range.