Remote sensor application

Solutions for difficult applications

Remote sensor solutions is necessary for applications that are difficult to reach, or when the ambient temperature at the control actuator is high. In these cases the remote mount positioner solution provides safety and ease of use.

The challenge – applications where there is poor accessibility, increased vibrational loading or particularly harsh environmental conditions These kinds of applications often involve higher costs due to gaining access especially during unexpected failures. 

The solution – using TZIDC or EDP300 positioners featuring a separate position sensor housing, which can be up to 10 m (32 ft) away from the device Easier and safer access to the positioner in hardto-reach valve installations.

Available as options:

• Enhanced vibration immunity up to 2 g at 300 Hz for higher frequency applications

• Advanced IP67 protection class for challenging applications

• Optional modules and mechanical feedback for the valve position

• Stainless steel housing for offshore use

• Increased temperature resistance of up to 100 °C (212 °F)

I/P converter

Improved process control

The challenge – dealing with particles blocking a valve

Certain types of enzyme production processes have traditionally posed a problem for accurate valve control where particles of a certain size can cause valves to become blocked, resulting in unplanned downtime to trace and rectify the problem. In the enzyme production processes, problems can arise from the presence of larger cellulose particles in the process fluids. Planned downtime can arise as a result of troubleshooting and correcting the faults.

The solution – using I/P signal converters for valve position control 

The solution to this problem is to use an I/P signal converter as part of an open loop control system. The converter regulates the position of a small diaphragm valve with a 15 mm (0.59 in) stroke. The valve controls the flow over a range of 50 to 2,000 l/h (13.20 to 528.34 gph), with an accuracy of ±3 to 5 l/h (±0.79 to 1.32 gph). By responding less quickly to changes on the process side of the valve, the signal converter introduces a delay in the valve response so that it effectively ignores any short term deviations caused by cellulose particles passing the valve.This helps to prevent the valve from becoming blocked, even when it is only slightly open. The consequent reduction in unplanned plant downtime and associated production disruption help boost profitability and increase plant availability.

Key features & benefits

• Compact design and variable mounting positions for maximum installation flexibility

• Output signal from 0.2 to 1 bar (3 to 15 psi)

• Robust design with IP65 field housing enables use in arduous and hostile environments

• High functional stability helps maximize control accuracy

• Vibration immunity up to 10g / 80Hz provides unsurpassed performance

Analog positioners

Reliable solution for basic applications

The AV series analog positioners provide flexible and cost-effective valve automation solutions for any control valve application.

Why are they used?

The AV series provides the highest throughput air capacity in the industry without changing the spool valve. With its rugged design, these positioners have built a widespread reputation for providing long-life service. The AV is standard for either single or double acting fail safe applications suitable for linear or rotary type actuators. An optional position feedback transmitter is available for further flexibility.

AV1 pneumatic positioner

Accepts a pneumatic input signal 0.2 to 1 bar (3 to 15 psi) to provide sensitive and accurate positioning of a pneumatic final control element via its integral spool valve. A high temperature option is available for applications up to 121 °C(250 °F).

AV2 and AV27 electro-pneumatic positioner

Accepts a 4 to 20 mA input from a controller and converts the signal to an pneumatic output via its integral I/P and spool valve to provide sensitive and accurate positioning of a pneumatic final control element. The model AV27 is an explosion proof solution with press-fit I/P mounted to the outside of the positioner housing. The result: a complete integrated explosion proof positioner.

Key features & benefits

• High supply pressure applicability – up to 10 bar (145psi)

• High throughput capacity – up to 49 Nm³h (29 scfm) at 6 bar (90 psi) air supply pressure

• Characterizable output – large positioning cam contains linear, square and square root relationships

• Accurate calibration – independent zero and span adjustments eliminate interaction and provide fast, accurate calibration

• Split range service – split range capability allows sequencing of multiple actuators using a single control signal