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Electric / Pneumatic Intrinsically Safe ISP5 Positioner spirasarco Spirasarco

Electric / Pneumatic Intrinsically Safe ISP5 Positioner spirasarco Spirasarco

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Electric / Pneumatic Intrinsically Safe ISP5 Positioner
ISP5 is a 2-wire positioner, which requires a 4-20mA signal input, which is suitable for linear pneumatic actuators. The positioner compares the input electric signal from the controller with the feedback signal of the stroke position of the control valve, and outputs different air pressure signals to the actuator according to the comparison result. For the output signal of any controller, the position of the valve can be guaranteed, and it can overcome the influence of the pressure difference of the valve, the friction of the valve stem and the change of the diaphragm damping. According to the NAMUR standard, whether it is pillar-mounted or yoke-mounted, mounting accessories are provided with each positioner, and a safety cover is also provided.

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Introduction to the Spirax Sarco ISP5 locator
The EP5 positioner is a two-wire loop-powered positioner that requires a 4-20mA control signal for linear pneumatic valve actuators. The positioner compares the signal from the controller with the actual position of the valve and changes the pneumatic output signal of the actuator accordingly. It can maintain the required valve position for any control signal, and at the same time can overcome the effects of changes in pressure difference, valve stem friction and hysteresis. The mounting kit provided with this positioner complies with pillar or yoke mounting according to NAMUR standard.

How does the Spirax Sarco ISP5 positioner work?
The work of Spirax Sarco EP5 is based on the principle of balance of forces, which is achieved by a nozzle / baffle mechanism and a feedback spring. The electrical signal from the controller is converted into a proportional pressure signal. The pressure signal acts on the baffle through the receiver, causing the position of the baffle relative to the nozzles U1 / U2 to change. The decompression bleed air from the air source is supplied to the amplification relay, and is also supplied to one of the nozzles U1 / U2. The pressure drop due to the movement of the baffle through the nozzle is sensed by the amplification relay. The amplification relay outputs a signal proportional to the pressure drop across the nozzle to the actuator. Due to the movement of the actuator, the lever connected to it causes a change in the tension of the feedback spring. This tension acts on the baffle to move it to a new position, where the force generated by the spring and the applied pressure signal are balanced.

Spirax Sarco ISP5 Locator Safety Information
The trouble-free and safe operation of EP5 and ISP5 positioners depends on proper transportation, storage / installation and commissioning, proper use and careful maintenance by qualified personnel.
Please read Spirax Sarco's general manual IM-GCM-10. Before installing / using / maintaining the positioner, consider the following:
working environment
aisle
illumination
Danger of fluids in pipes
temperature
System isolation

Spirax Sarco ISP5 Positioner Ordering Instructions
Example: 1-Electric / Pneumatic Spirax Sarco EP5 Positioner

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