Data Sheet

3610J and 3620J Positioners

D200064X012

Product Bulletin

62.1:3610

February 2015

pressure, continues to increase until the summing

beam torques are in equilibrium. At this point, the

valve shaft is in the correct position for the specific

input signal applied.

For reverse action, input signal pressure is channeled

to both cavities A and B. An increase in signal pressure

results in an upward force on the summing beam,

pivoting the summing beam clockwise and causing

relay B to exhaust upper actuator cylinder pressure to

atmosphere and relay A to increase lower actuator

cylinder pressure. As a result, the actuator rod retracts

and the actuator rotary shaft rotates

counterclockwise. This causes the feedback arm to

pivot counterclockwise reducing the force applied to

the summing beam by the range spring.

As the valve shaft rotates counterclockwise, the range

spring force to the summing beam continues to

reduce until the summing beam torques are in

equilibrium. At this point, the valve shaft is in the

correct position for the specific input signal applied.

3620J or 3620JP positioners (figure 4) are a

combination of a 3610J or a 3610JP positioner with a

3622 electro-pneumatic converter. The

electro-pneumatic converter provides a 0.2 to 1.0 bar

(3 to 15 psig) output pressure proportional to the

4-20 mA DC input signal. The 0.2 to 1.0 bar (3 to 15

psig) output pressure becomes the input signal

pressure to the 3610J or 3610JP pneumatic positioner.

Installation

The supply pressure medium must be a clean, dry, and

oil-free air, or noncorrosive gas (3610J positioners

only). If the supply pressure source is capable of

exceeding the maximum actuator operating pressure

or positioner supply pressure, appropriate steps must

be taken during installation to protect the positioner

and all connected equipment against overpressure.

Typical positioner mounting on an actuator is shown

on the front page. Overall dimensions are shown in

figure 5.

Note

3620J and 3620JP positioners are not approved for use with

natural gas as the supply medium.