Masoneilan™ Pneumatic & Electropneumatic Valve Positioners

4700P/4700E & 4800P/4800E Pneumatic & Electropneumatic Positioners

Masoneilan™ 4700P/4700E & 4800P/4800E Features & Benefits:

One Multi-Lobe Cam

• The cam provides field-changeable linear, split-range linear, and equal percentage control characteristics. Custom characteristics are available on special order.

Zero Adjustment

• Adjustment of the positioner zero can easily be accomplished by means of the adjustable spring button. Further zeroing can be performed through the turnbuckle assembly on linear motion actuators.

Corrosion-resistant Materials

• Premium performance is the standard on the models 4700P/4700E and 4800P/4800E positioners. Internal components are manufactured of corrosion-resistant materials for protection against the harshest environments.

Fully Enclosed

• All adjustments are fully enclosed for protection from the environment.

Simplicity

• Positioner action can be reversed without additional parts (4700P/4800P only). The same mounting orientation is used for both direct and reverse action.

Easy to Maintain

• The pilot valve is the only moving part in the pilot housing. It is easily removed without disassembling any other part of the positioner. An optional bypass valve module is available for use on the model 4700P pneumatic direct-acting positioner. Where operating parameters allow, it permits the positioner to be isolated for maintenance while operating the valve directly with the instrument signal. The bypass module is mounted on the back of the positioner to discourage tampering.

Optional Bypass

• A molded nylon bypass valve with an O-ring seal permits continued automatic control during the cleaning of the pilot valve. The bypass valve is concealed in the back of the unit to prevent tampering. The bypass is available only on the direct action 4700P pneumatic positioner.

Damping Adjustment

• On model 4700, the actuator travel speed can be adjusted as required for stable operation