Cooper Instruments PTT220-100 User Manual

PTT 220/222 and K8

PRESSURE TRANSDUCERS

WARNING!
This instrument is susceptible to damage when exposed to
static electrical charges. To avoid damage to the transducer
observe the following:

*Ground the body of the transducer BEFORE making any
electrical connections.

*When disconnecting, remove the ground LAST.

Note: The braided shield and drain wire in the cable (if
supplied) is not connected to the transducer body, and is not a
suitable ground.

CAUTION: Pressure spikes in excess of the rated
overpressure capability of the transducer may cause
irreversible electrical and/or mechanical damage to the
pressure measuring and containing element(s).

Mounting
The transducer requires no special mounting hardware, and
can be mounted in any plane with negligible position error.

Although the unit can withstand normal vibration without
damage or significant output effects, it is always good practice
to mount the transducer where there is minimum vibration.

For units with NPT type pressure fittings apply Teflon tape or
an equivalent sealant to the threads before installing.

When tightening, apply a wrench to the hex wrench flats
located just above the pressure fitting. DO NOT tighten by
using a pipe wrench on the housing.

Power Supply-PTT 220 only

The supply voltage for the 1-5 and 1-6 Vdc output transducers
must be within the range of 10 to 36 Vdc. The maximum
supply voltage for a 4-20Ma current output transducer is 36
Vdc while the minimum supply voltage is dependent upon the
loop resistance of the circuit. The load limitation chart shows
the minimum supply voltage (V
resistance (R

loop

).

) required for a given loop

min

V Rev12/01 1 CF71

Noise
For minimum noise susceptibility, avoid
running the transducer’s cable in a conduit
that contains high current AC power
cables. Where possible avoid running the cable near inductive
equipment.

Shield Wiring

Connect the braided shield to the guard terminal on the
reading instrument (meter, etc.) if available or to ground or to
the power supply negative terminal.

Adjustment Potentiometers

The zero and span pots are accessible through the top of the
case. Loosen the four screws and separate the top carefully.
The zero pot is marked with a white dot.

Vent Tube

The cable will have a clear Teflon vent tube that’s required at
pressure below 500 psi to provide atmospheric reference. The
open end should be placed in a dry area.

Output-K8 only

Sensitivity may be from 6 mV/V to 18 mV/V for any individual
transducer. Zero offset is with in ±3 mV/V. Output is
proportional to supply voltage (ratiometric).

Excitation-K8 and PTT 222 only

For proper operation a voltage within the range of 5 to 10 Vdc
must be applied between the transducer’s supply terminals.

Life Support Policy

Cooper’s products are not authorized for use as critical
components in life support devices or systems without the
express written approval of the General Manager, Transducer
Operation of Cooper Instruments. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and whose failure to perform,
when properly used in accordance with instructions or use
provided in the labeling, can be reasonably expected to
result in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.

V Rev12/01 2 CF71