Dresser Masoneilan SVI II AP-2, Быстрый старт

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Masoneilan Dresser SVI II AP Quick Start Guide
4
Necessary Precautions
To avoid injury or the process being affected when installing or
replacing a positioner on a control valve, ensure that:
™ If the valve is located in a hazardous area make
sure the area has been certified as “safe” or that all
electrical power to the area has been disconnected
before removing any covers or disconnecting any
leads.
™ Shut off air supply to the actuator and to any valve
mounted equipment.
™ Ensure the valve is isolated from the process by
either shutting off the process or using bypass
valves for isolation. Tag shutoff or bypass valves to
guard against a “turn-on” while work is in progress.
™ Bleed air from actuator and check that valve is in its
unenergized position.
It is now safe to disconnect and remove any valve mounted equipment
that is being replaced.
For the procedure to mount rotary and reciprocating valves, refer to the
Mounting Instructions contained in the valve’s Mounting Box kit.
Installing the
SVI II AP
Remote
Position
Sensor
An option that is available for the SVI II AP is the Remote Position
Sensor. The Remote Position Sensor, is a remotely mounted position-
sensing device, that is connected electrically to an SVI II AP valve
positioner. It is used as position feedback in applications where direct
mounting of an SVI II AP to a valve actuator is not practical due,
typically but not limited to, extreme vibration, heat or radiation.
The Remote Position Sensor is a potentiometer located in an enclosure
which can be mounted on a valve or damper to indicate stem position
when connected to a suitable receiver. There is a three wire connection
provided on a screw terminal block to interconnect to the receiving
device.
The SVI II AP Remote Position Sensor is suitable for installation
outdoors in an industrial environment. Mounting kits are provided to
permit mounting on a variety of valves.
Do not remove the instrument cover or connect to an electrical circuit in
a Hazardous Area unless the power is disconnected.
™ Comply with current national and local regulations
for electrical installation work.