P61-2G3B-PEA datasheet(21/60 Pages) MAGNETROL

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48-620 Modulevel Pneumatic Liquid Level Control

NOTE: Use extreme care in handling the reed switches during wiring

and adjustment procedures.

2.3.7.3 Adjustment Procedure

Prior to adjusting the reed switches, the Pneumatic

Modulevel should be calibrated to obtain the desired

pneumatic proportional band and level position

adjustment.

After wiring the reed switches to the device to be

operated, they may be adjusted manually to actuate at

the desired high and low liquid level positions. Move

the liquid indicator by hand to the desired low level

actuating point on the indicator scale.

NOTE: Scale readings are expressed in percent of displacer length.

Hold the indicator at the desired low level actuating

point. Turn the left hand adjuster screw until the reed

switch actuates.

The high level reed switch is adjusted in the same

manner by moving the level indicator to the desired

high level actuating point, and by turing the right

hand adjuster screw until the high level reed switch

actuates.

2.4

Field Modifications and Adjustments

2.4.1 Changing Controller Action

The controller can be changed from direct acting to

reverse acting or vice versa. Should it be required to

change the controller action, refer to step 2 in the

Proportional Controllers section of Calibration.

Refer to page 13.

2.4.2 Proportional Band Models to Differential Gap

A proportional band controller can be changed to operate

in the differential gap mode. For the appropriate proce-

dures, see the Differential Gap section on page 18.

2.4.3 Pneumatic-to-Current (P/I) Converter

Modulevel units are available with a P/I transducer to

provide an electronic output signal proportional to liquid

level change. Refer to the manufacturer's instructions

supplied with the transducer.

Reed Switch

Adjuster

Screw

Non-Magnetic

Enclosing Tube

Level Sensing

Displacer

Magnet

Attractor

Pivoted

Magnet

Liquid Level

Indicator Scale

Figure 15

P61-2G3B-PEA Datasheet(PDF) 21 Page - Magnetrol International, Inc.

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