IPT
2
12
The Interface Solution Experts
1. Remove the IPT
2
from the mounting block by
pressing down on the locking lever and pulling
straight out to disengage the pneumatic fi ttings.
2. To remove the supply air fi lter screen, fi rst slide
the nozzle retainer clip to the right and then pull
the nozzle out of the main body.
3. Remove the fi lter screen and fl ush with TCE and
air dry before reinstalling.
4. Slide the nozzle back into the main body.
Troubleshooting
Many components of the IPT
2
have been thermally
aged, tested, and selected using a computer-aided
design program. This usually makes fi eld repair
unnecessary. It is therefore recommended that any
unit found to be performing below specifi cations
be returned to the factory in accordance with the
instructions found on the back cover of this manual.
If a problem is suspected with the IPT
2
, review the
following steps:
1. Make sure that all connections are clean and
tight.
2. Verify that bench instruments used to take
measurements have the proper range and
accuracy and are currently certifi ed.
3. Check that the bleed-air port (located in a slot on
the right side panel) is not restricted.
4. Using a test jumper, connect one end to the
metal case and the other end to an "IN" terminal
while observing the output pressure. The output
pressure should not change.
5. If a change in the relationship between the input
and the output occurs, try to correct it by re-
adjusting the Zero and Span controls.
6. If the response time lengthens or the span drops,
this may indicate a blockage due to air supply
contamination. Clean the orifi ce and the supply
air fi lter as described in the Maintenance section.
Operation
Reverse output operation:
Once adjusted and installed, the IPT
2
operates
unattended, except for occasional cleaning of the air
supply fi lters.
If a malfunction is isolated to the IPT
2
, refer to the
Troubleshooting section for recommendations. A unit
may become warm during operation, especially where
the ambient temperature is elevated. This is normal
and should not be cause for alarm.
The high-performance line of I/P transmitters
utilizes an internal feedback loop to ensure accurate
operation. The feedback loop consists of an internal
pressure transducer that samples the unit’s output
pressure and compares it to the input signal. This
allows the unit’s output to track the input signal.
Since the feedback loop requires power to operate,
when there is no input power to the unit, the
pneumatic output will be shut off . Units that use
mechanical positioning only, will typically still have a
pneumatic output when power is removed.
This is not an issue except for those users that rely on
this elevated output (18PSIG) to maintain a valve’s
position upon the unexpected loss of input signal
(4-20mA). In such cases, the IPT
2
reacts diff erently by
shutting off the pneumatic output.
Maintenance
After the IPT
2
has been installed into the application,
no maintenance is required.
However, the IPT
2
is equipped with a plunger to clean
the orifi ce. To use the orifi ce-plunger, depress the
plunger located on the side of the unit. This pushes
a stainless steel wire through the orifi ce and removes
any particles lodged inside. The output pressure will
fl uctuate when the plunger is activated.
If the plunger does not fi x the problem, the supply
air fi lter screen should be removed and fl ushed with
trichloroethance (TCE) and then air dried before
replacement. Follow the directions below.