Pneumatic Connections; Safety Instructions; Information On Double Acting Actuators With Spring- Return Mechanism; Notes On Abb Pressure Gauge Blocks - ABB TZIDC Manual

32 TZIDC DIGITAL POSITIONER | CI/TZIDC/C-FM-US-EN REV. A
... 5 Installation

Pneumatic connections

Safety instructions

CAUTION
Risk of injury
Risk of injury from pressurized positioner / actuator.
• Before starting work on the positioner / actuator, switch
off the air supply and vent the positioner / actuator.
NOTICE
Damage to components!
Contamination in 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)
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.
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.
In order to ensure that this behavior cannot occur, 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).

Notes on ABB pressure gauge blocks

The pressure gauge blocks available as accessories from ABB
have a restricted operating temperature range and a different IP
rating than the positioner.
The operator must take these restrictions into account when
using ABB pressure gauge blocks.
ABB pressure gauge block specification
Operating temperature −5 °C to 60 °C
range (23 to 140 °F)
IP rating IP 30