IPT
2
The Interface Solution Experts
7
Figure 2. Non-Redundant System with Refrigeration Dryer
Cooler
Receiver
5-Micron General
Purpose Filter(s),
One Main or Multiple
on Branch Lines
Refrigeration
Dryer
Extend Branch Line(s) Above Main
Line to Avoid Passing Liquids
0.01-Micron
High Efficiency
Coalescing
Filter(s)
{
Purified Air
For IPT
2
's
Main Line to
Other Branches
Keep Short
Pressure
Regulator
D
Note: All fi lters should have
automatic drains and service
life indicators to show when
elements need changing.
Calibration
This section provides information necessary to adjust
and calibrate the IPT
2
. Each unit is calibrated and
checked at the factory prior to shipment. Before
installation, every IPT
2
should be checked by the user
for proper operation. Generally, these checks, which
are specifi ed under Calibration Procedures, require
little or no adjustment.
Adjustments
The IPT
2
has Zero and Span adjustments located
on its front panel. The type of potentiometer used
with these adjustments usually require 15 turns of
the shaft to move the wiper from one end of its range
to the other. It is equipped with a slip clutch at each
end to prevent damage if the adjustment is turned
beyond the wiper stop. Usually a slight change can
be felt when the clutch is at the end of a range (i.e., it
is slipping). However, if this change is not felt, either
end can be reached by turning the shaft 15 turns in
the desired direction.
Turning these potentiometers clockwise causes the
related output to increase in quantity or become more
positive; while turning them counterclockwise causes
the related output to decrease in quantity or become
more negative.
The Zero and Span potentiometers provide an
adjustment range of ±10% of full scale.
Calibration Equipment
Table 2 lists the equipment required to calibrate the
IPT
2
. This equipment is not supplied with the unit and
must be provided by the user.
Table 2.
Calibration Equipment
Equipment
Adjustable current source
DC milliammeter
Instrument air supply
Air pressure gauge
Air pressure gauge
Phone tip probes (2)
Pneumatic test coupler
MII P/N 163-202-00
Pneumatic load
Characteristics
0-50mA output
Accurate to ±0.05%
Filtered
Accurate to ±2%
Accurate to ±0.1%
Must have 2mm (0.8 in) diameter tips, .5 inch long
For IPT
2
s with optional test jacks
Volume of 7.5 cubic inches (approx. 120 milliliters)
Purposes
Simulate input signal
Measure input signal
Air supply
Measure air supply pressure
Measure output pressure
Easy access to input signal (optional)
Easy monitoring of output pressure (optional)
Provide standard load for testing (per IEC spec. #770)