Ashcroft K1 Operating Manual

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Load Limitations 4-20mA Output Only

(R

LOOP

)

K1, K2, K8
PRESSURE TRANSDUCER
INSTRUCTION SHEET

WARNING! READ

m

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage may
be caused by excessive overpressure,
excessive vibration or pressure pulsation,
excessive instrument temperature, corro­sion of the pressure containing parts, or
other misuse. Consult Ashcroft Inc., Strat­ford, Connecticut, USA before installing if
there are any questions or concerns.

2. OVERPRESSURE:

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 elements.

Fluid hammer and surges can destroy any
pressure transducer and must always be
avoided. A pressure snubber should be
installed to eliminate the damaging ham­mer effects. Fluid hammer occurs when
a liquid ow is suddenly stopped, as with
quick closing solenoid valves. Surges
occur when ow is suddenly begun, as
when a pump is turned on at full power or
a valve is quickly opened.

Liquid surges are particularly damag­ing to pressure transducers if the pipe
is originally empty. To avoid damaging
surges, uid lines should remain full (if
possible), pumps should be brought up to
power slowly, and valves opened slowly.
To avoid damage from both uid hammer
and surges, a surge chamber should be

installed.

Symptoms of uid hammer and surge's
damaging effects:

• Pressure transducer exhibits an output
at zero pressure (large zero offset).

• Pressure transducer output remains
constant regardless of pressure

• In severe cases, there will be no output.

FREEZING:

Prohibit freezing of media in pressure
port. Unit should be drained (mount in
vertical position with electrical termination
upward) to prevent possible overpressure
damage from frozen media.

m

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible
to damage when exposed to static electri­cal charges. To avoid damage to the trans­ducer observe the following:

• Operator/installer should follow proper
ESD (electrostatic discharge) protection
procedures before handling the pressure
transducer.

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

MOUNTING

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

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

For units with NPT type pressure ttings
apply teon tape or an equivalent sealant to
the threads before installing.

When tightening, apply a wrench to the hex
wrench ats located just above the pres­sure tting. DO NOT tighten by using a pipe
wrench on the housing.

POWER SUPPLY – K1 Models 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
given loop resistance (R

NOISE

For minimum noise susceptibility, avoid
run ning the transducer’s cable in a con duit
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.

) required for a

min

).

LOOP

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 Teon 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
within ±3 mV/V. Output is proportional to
supply voltage (ratiometric).

EXCITATION – K8 & K2

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

OPERATING
REGION

V

= 10V+ (.022A x RL)

min

RL = RS + R

RL = Loop Resistance (ohms)

RS = Sense Resistance (ohms)

RW = Wire Resistance (ohms)

W

© 2012 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA. Tel: [phone] • Fax: [phone], All specications are subject to change without notice.
All sales subject to standard terms and conditions. All rights reserved. www.ashcroft.com. I&M011-10063-1/01 (250-2924). Rev. A 7/12

3.0

.625
HEX

6-PIN BENDIX

0.9 SQ.

-------------------

4-PIN BENDIX

0.8 SQ.

3.0

0.5

0.34

0.5

1.1

2.1

.625
HEX

K1, K2, K8
PRESSURE TRANSDUCER
INSTRUCTION SHEET

Wiring Diagrams for All Transducers

+

POWER
SUPPLY

–

+

–

METER

4-Wire Ratiometric (mV/V)

+

POWER
SUPPLY

–

–

+

METER

POWER
SUPPLY

+

–

+

–

METER

(+ Power)

RED

(- Power)

WHITE

(+ Output)

GREEN

(- Output)

BLACK

(Blue, K8 only)

(+ Power)

(Common)

(+ Output)

3-Wire Voltage

(+)

POWER

TRANSDUCER

(–)

OUTPUT

4-20 mA

TRANSDUCER

TRANSDUCER

K1 Transducers – Electrical Connections

Voltage Output Units 1-5, 1-6 Vdc

CONNECTOR

TYPE

Hirschmann Type

PIN 1 = + Power Red
PIN 2 = Common Black
PIN 4 = Output Green

Bendix 4-Pin, 6-Pin

Pin A = + Power Red
Pin B = Output Green
Pin D = Common White

Cable Type F2

Red = + Power
White = Common N/A
Green = Output

Cable Type C1

Red = + Power
White = Common N/A
Green = Output

Current Output Units 4-20mA

CONNECTOR

TYPE

Cable Type F2

Red = + Power N/A
Black = – Power

Cable Type C1

Red = + Power N/A
Black = – Power

Hirschmann Type

Pin-1 = + Power Red
Pin-2 = – Power Black

Bendix 4-Pin, 6-Pin

Pin A = + Power Red
Pin B = – Power Green

MATING

CONNECTOR

CABLE CODING

MATING

CONNECTOR

CABLE CODING

Dimensions

NOTE: All dimensions are decimal inches

K1, K2 Transducers

K2 Transducers – Electrical Connections

Ratiometric (mV/V)

CONNECTOR

TYPE

Cable Type F2

Red = + Power
White = – Power N/A
Green = + Output
Black = – Output

Cable Type C1

Red = + Power
White = – Power N/A
Green = + Output
Black = – Output

Bendix 4-Pin

Pin A = +Power Red
Pin B = +Output Green
Pin C = – Output Black
Pin D = – Power White

Bendix 6-Pin

Pin A = +Power Red
Pin D = – Power White
Pin B = +Output Green
Pin C = – Output Black
Pin E = Shunt Cal.
Pin F = Shunt Cal.

Recalibration Instructions:

1. Apply 0% Full Scale Pressure.

2. Set the output using the Zero adjustment potentiometer.

3. Apply 100% Full Scale Pressure.

4. Set the output using the Span adjustment potentiometer.

5. Repeat steps 1 thru 4 as necessary.

MATING

CONNECTOR

CABLE CODING

K8 Transducers – Electrical Connections

Special Wiring – See “X” Variation
On Unit Label

Variation Wire Hookup

Red = + Power
XTQ Black = Common
White = Output

Red = + Power
XTG Black = Common
Green = Output

K8 Transducers

Ratiometric (mV/V)

Cable Type F2

Red = + Power
White = – Power
Green = + Output
Black = – Output

4 Inch Leads

Red* = + Power
White = – Power
Green = + Output
Blue = – Output

*Orange = + Power, RoHS compliant

versions

© 2012 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614, USA. Tel: [phone] • Fax: [phone], All specications are subject to change without notice.
All sales subject to standard terms and conditions. All rights reserved. www.ashcroft.com. I&M011-10063-1/01 (250-2924). Rev. A 7/12