Drawing Number: 21070
Revision: NR
OPERATION MANUAL FOR
ICP
®
PRESSURE SENSORS
Models 102A02, A05, A07, A09
Models 112A21, A22, A23
2
Models 102A02, 102A07, and 102A09 utilize the
same inner probe design but in a 3/8-24 threaded
adaptor with floating clamp nut to allow adjustment
of diaphragm depth where it is necessary to adapt to
various wall thicknesses. These models are supplied
only in low pressure (100 and 50 psi) versions and
are also "off ground".
102A
’
s: Thread Mount with Floating Clamp Nut,
Ground-Isolated Sensor
3.0
INSTALLATION
This manual contains outline and installation
information for your specific model in this series.
Prepare mounting ports in accordance with the
installation drawing for the specific model, paying
particular attention to sealing surfaces. These
surfaces must be smooth and free from chatter marks,
nicks and other irregularities which could preclude a
pressure-tight seal.
Seals are provided with each sensor and should
always be used. Extra seals for all standard models
are in stock at the factory. Replace seals when they
become unserviceable.
In some cases, e.g., where flash temperatures such as
those generated by combustion processes are present,
it may be necessary to thermally insulate the
diaphragm to minimize spurious signals generated by
these effects.
Common black vinyl electrical tape has been found to
be an effective insulating material in many cases.
One or more layers may be used across the end of the
diaphragm without affecting response or sensitivity.
A silicone rubber coating approximately .010" thick
has also been proven effective in many applications.
General Electric RTV type 106 silicone rubber is
recommended. Apply the rubber coating and allow to
cure
in
accordance
with
the
manufacturer's
instructions.
Although ICP
sensors have low output impedance
and in general are not affected by moisture, in
extreme environments it is good practice to protect
cable connections with shrink tubing.
It is not necessary to use low-noise coaxial cable with
this sensor series. In fact, a Model 070A09 solder
connector adaptor that allows the use of ordinary two-
wire cable is desired.
4.0
OPERATION
It is only necessary to supply the sensor with a 2 to 20
mA constant current at +20 to +30 VDC through a
current-regulating diode or equivalent circuit. (See
Guide G-0001B for powering and signal utilization
information pertaining to all ICP
instrumentation).
Most of the signal conditioners manufactured by PCB
have an adjustable current feature allowing a choice
of input currents from
2 to 20 mA. In general, for
lowest noise (best resolution) choose the low current
ranges and for driving long cables (to several
thousand feet) use the higher current, up to 20 mA
maximum.
To operate system using a PCB signal conditioner:
1.
Switch power on.
2. Wait several minutes for the IC amplifier to turn
on and stabilize.
3.
Proceed with measurements.
4.1
OPERATINGCONSIDERATION
FOR MODEL 112A23
The Model 112A23 features a low-noise amplifier
which, based on a peak-to-peak broadband noise
factor of 50
V, results in a resolution of .001 psi.
Содержание S102A07
Страница 11: ......
