topworx回讯器说明书(26)

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4-20mA Transmitter

4-20mA Transmitter: Options LX/MX/KX/EX/TX/ZX/0X

D-Series Upgrade Procedure: 4-20mA Position Transmitter

(Use the following installation procedure to upgrade an existing D-Series in the field)

Typically the 4-20mA Position Transmitter module and potentiometer options are already installed in TopWorx valve controller products. Use the following installation directions only if you are replacing or upgrading an existing unit:

1) First remove the valve monitor enclosure from the valve/actuator

2) Install the 4-20mA position transmitter using the supplied or existing mounting bolts (See illustration below)

3) Remove the existing shaft and replace with the new shaft and position sensor kit assembly (See illustration below)

a) Remove circlip and washer from shaft on bottom of enclosure (outside) b) Pull shaft out gently from top side of enclosure

c) Install lube (from packet) on new shaft just below potentiometer and spread around o-ring seals on shaft

4) The alignment boss on the bracket (indicated in Illustration 10) should hold one of the mounting ears of the

sensor in place. Once mounted, verify that no rotary movement of the potentiometer housing is possible 5) If applicable, plug the position sensor cable into the 4-20mA position transmitter keyed header connector 6) Connect the three output wires to the indicated terminal block positions if you are using the potentiometer

only option.

7) The module is now ready for calibration/operation

8) Before mounting the DXP to an actuator, make sure the potentiometer alignment marks are aligned as shown in the illustration below with

the valve in the closed position.

The potentiometer has been factory set for typical valve rotation ranges from 2º to 180º in counter-clockwise rotation applications from the 4mA position to the 20mA position and from valve rotation ranges from 2º to 90º in clockwise rotation applications from the 4mA position to the 20mA position. Please contact TopWorx for proper potentiometer set up for ranges greater than specified above.

Module and Bracket

Potentiometer Shaft Assembly

21

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