Ametek Land 4750-PM, User Manual

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User Guide 5 - 8
Particulate Measurement System 4750-PM
5.3.2 Engineering Functions [ENG]
Several test, reset and 4-20 mA adjustment functions can be accessed via
this menu.
Setting Description
RSET Resets the sensor to factory (=default) values.
420Z Trims 4-20mA Zero Offset (4mA).
420F Trims 4-20mA Full Scale (20mA).
T.REL Tests the relays.
T.DIG Tests the digital input.
T.LED Tests the LEDs.
Trimming the 4-20mA Outputs [420Z, 420F]
1) Scroll DOWN to the ENG menu.
2) Press RIGHT repeatedly to access the
420Z and 420F submenus. To
adjust the values, proceed as follows:
a. When accessing the 4-20 mA Zero [
420Z ] setting, the sensor
nominally outputs 4 mA. Use the UP/DOWN buttons to adjust the
4-20 mA Zero calibration value (default: 223) to trim the 4 mA
value.
b. Similarly, when accessing the 4-20 mA Full Scale [ 420F ] setting,
the sensor nominally outputs 20 mA. Use the UP/DOWN buttons to
adjust the 4-20 mA Full Scale calibration value (default: 4385) to
trim the 20 mA value.
Test Functions [T.REL, T.DIG, T.LED]
1) Scroll DOWN to the ENG menu.
2) Press RIGHT repeatedly to access the test function submenus.
3) Use the UP/DOWN buttons to change the values. The table below shows
the operation of the test functions.
Setting Value Meaning
Relays [T.REL]
Set to 1
Set to 2
Relay 1 Open
Relay 2 Open
Digital Input
[T.DIG]
Open
Apply 24 V to close
Display 0000
Display 0001
LEDs [T.LED]
Set to 0
Set to 3
All LEDs = GREEN
Self-check LED = RED