Moniteur 40 Series VALVE Positioners - Manual (Page 7)

Moniteur
M O N I T E U R D E V I C E S I N C O R P O R A T E D
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Page 6
Installation and Operating Instructions
Series 40 Positioners
For improved control using smaller actuators, a restricted pilot valve orifice
kit is included with the positioner. To install, the pilot valve must be
removed from the positioner. Remove the four screws holding the pilot to
the positioner body. As you remove the valve, be sure to hold the
compensation spring (see page 2) in place. Flip the valve so the bottom
faces you. Remove the o-rings from the out 1 and out 2 ports (as shown in
the diagram at right). Place the orifice plates in their place with new o-rings
above them, and re-install the pilot valve, making sure the compensation
spring is back in place. The positioner is now set up for smaller actuators.
Optional Restricted Pilot Valve Orifice
Dimensions (in.)
M
on
iteu
r
6.61
4.80 6.30
6.61
OUT 1 (1/4" NPT)
SUPPLY (1/4" NPT)
.67
OUT 2 (1/4" NPT)
1.63
4.33
1.97
4.38
Troubleshooting Tips
Hunting
* If your actuator is small, install orifice resitrictions
in ports 1 and 2 of the pilot valve.
* The nozzle might be clogged. Take the metal wire
located in the positioner cover and clean the
nozzle.
Poor Linearity
* Air supply might be unstable - check or install a
pressure regulator.
* Check Zero and Span adjustments
* Loose feedback lever - tighten feedback lever
Poor Hysteresis
* Loose mounting of the actuator to the positioner -
tighten the mounting bracket.
* Adjust the seat, using the seat adjuster (double
acting actuators only)
o-ring orifice
WARNING: Before removing pilot valve, be sure to disconnect
positioner from the signal and compressed air source.