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Ludlum Measurements
Ludlum Measurements

Ludlum Measurements Area Monitor Controller 375/4

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Ludlum Measurements Area Monitor Controller 375/4

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Ludlum Measurements Area Monitor Controller 375/4

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Ludlum Measurements Area Monitor Controller 375/4

Ludlum Measurements Area Monitor Controller 375/4

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Maintenance Plans for Ludlum Measurements Area Monitor Controller Model 375/4

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Area Monitor Controller Calibration

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CALIBRATION

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Apply 0 counts or reset the Model 375

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Adjust the OFFSET trimmer, R6, for a voltage of 1.00 V across Rterm

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NOTE: Loop ground is isolated from instrument ground.

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Apply a full-scale meter reading to the analog input. The voltage at full-scale must be set to 1.25 V ±0.1 V between the analog input and instrument ground.

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NOTE: Instrument ground is not the same as loop ground.

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Adjust the SPAN trimmer, R5, until the voltage across the 250-ohm terminating resistor is 5 V (V = .020 X Rterm).

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Repeat steps 1 thru 4 until no further adjustment is necessary to get the 1-volt and 5-volt or 4-mA and 20-mA readings.

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Sign off on the calibration

Run this procedureArrow right

Area Monitor Controlle Cleaning

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Warning: Only use water as the wetting agent for cleaning

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Instrument turned OFF

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Instrument power cord disconnected

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Wait for 1 minute before accessing internal components

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Internal components accessed after 1 minute

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Upload a photo of the cleaned instrument

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Sign off on the cleaning procedure

Run this procedureArrow right

Parts for Ludlum Measurements Area Monitor Controller 375/4

Access the parts list for your equipment in MaintainX.

Part Name
Part Number

Completely Assembled Model 375 Area Monitor

48-2230

Circuit Board, Assembled Circuit

5396-160

Capacitor 10µF, 20V

04-5655

Capacitor 27pF, 100V

04-5658

Capacitor 4.7µF, 25V

04-5653

Completely Assembled Model 375 Area Monitor

48-2230

Circuit Board, Assembled Circuit

5396-160

Capacitor 10µF, 20V

04-5655

Capacitor 27pF, 100V

04-5658

Capacitor 4.7µF, 25V

04-5653

Completely Assembled Model 375 Area Monitor

48-2230

Circuit Board, Assembled Circuit

5396-160

Capacitor 10µF, 20V

04-5655

Capacitor 27pF, 100V

04-5658

Capacitor 4.7µF, 25V

04-5653

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Thousands of companies manage their assets with MaintainX

DuracellAB InBevErgonTitan AmericaMeritUnivar SolutionsRivianCadrexMagnaMaasPresriteSoutheast PowerInterrollDuracellAB InBevErgonTitan AmericaMeritUnivar SolutionsRivianCadrexMagnaMaasPresriteSoutheast PowerInterroll

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