Pneumatic Connections; Information On Double Acting Actuators With Spring- Return Mechanism; Connection On The Device - ABB TZIDC Manual

TZIDC DIGITAL POSITIONER | CI/TZIDC/ATEX/IECEX-EN REV. C

Pneumatic connections

Note
The positioner must only be supplied with instrument air that is
free of oil, water, and dust.
The purity and oil content must meet the requirements of
Class 3 in accordance with DIN/ISO 8573-1.
NOTICE
Damage to components!
Contamination on the air pipe and positioner can damage
components.
• Dust, splinters, and any other particles of dirt must be
blown-out before the pipe is connected.
NOTICE
Damage to components!
Pressure above 6 bar (90 psi) can damage the positioner or
actuator.
• Provisions must be made (e.g. by using a pressure
reducer) to make sure that the pressure does not rise
above 6 bar (90 psi)*, even in the event of a fault.
* 5.5 bar (80 psi) (marine version)
Information on double acting actuators with spring-
return mechanism
On double-acting actuators with spring-return mechanism, a
pressure that significantly exceeds the supply air pressure value
can be generated during operation by the springs in the
chamber opposite the springs.
This may damage the positioner or adversely affect control of
the actuator.
To eliminate the possibility of this occurring, it is recommended
to install a pressure compensation valve between the springless
chamber and the supply air for these types of applications. It
enables the increased pressure to be transferred back to the air
inlet line.
The opening pressure of the check valve should be < 250 mbar
(< 3.6 psi).

Connection on the device

1 OUT 2
2 OUT 1
Figure 23: Pneumatic connections
Marking Pipe connection
IN Supply air, pressure 1.4 to 6 bar (20 to 90 psi)
Marine version:
• Supply air, pressure 1.4 to 5.5 bar (20 to 80 psi)**
OUT1 Output pressure to the actuator
OUT2 Output pressure to the actuator
(2. Connection with double acting actuator)
** (marine version)
Join the pipe connections according to the designation,
observing the following points:
• All pneumatic piping connections are located on the
right-hand side of the positioner. G¼ or ¼ 18 NPT tap
holes are provided for the pneumatic connections. The
positioner is labeled according to the tap holes available.
• We recommend that you use a pipe with dimensions of
12 × 1.75 mm.
• The supply air pressure required to apply the actuating
force must be adjusted in line with the output pressure in
the actuator. The operating range of the positioner is
between 1.4 to 6 bar (20 to 90 psi)***.
*** 1.4 to 5.5 bar (20 to 80 psi) marine version
3 IN
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