Automatic Gain Control (Agc) - Ametek DM330 Series Installation And Operating Instructions Manual

DM330 Series - Magnetostrictive Level System User's Manual
4.3

Automatic Gain Control (AGC)

4.3.1 Manual AGC test
4.3.2 AGC test via Optional Housing Push buttons
The AGC does not require any adjustment in normal operation.
If the signal becomes unstable or goes to 3.8 mA with the float
in the active range of the probe, check the AGC as follows:
Open the probe housing in a Safe Area if application requires
intrinsically safe approval.
1. Place float magnet near top of probe (if probe length is under
24 ft) or place the float magnet near the bottom of probe (if
probe length is over 24 ft)
2. Short White (Program) wire to Black (negative Loop) wire
and apply power to the probe.
3. The output will go from 12 mA to 20 mA if successful or to
3.8 mA if AGC failed.
4. Remove power from the system and remove the short (White
wire to black wire).
5. Re-apply power and the system will return to normal
operating mode (4-20mA) with new gain set.
6. If the system does not pass the AGC test or return to normal
operation after completion of the above steps, contact the
factory.
1. Place float magnet near top of probe (if probe length is under
24 ft) or place the float magnet near the bottom of probe (if
probe length is over 24 ft).
2. Press and hold the Zero Button and apply power to the
probe.
3. The output will go from 12 mA to 20 mA if successful or to
3.8 mA if AGC failed.
4. Remove power from the system.
5. Re-apply power and the system will return to normal
operating mode (4-20 mA) with new gain set.
6. If the system does not pass the AGC test or return to normal
operation after completion of the above steps, contact the
factory.
30
(All diagnostic values with tolerances of +/- 0.02 mA)