Ashcroft ZT12 User manual

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 1
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
Cautions for proper and safe
operation. To use this product
safely, please read this instruction
manual carefully. Incorrect operation
may cause malfunction, damage
or accident. The cautions and
warnings in the document are
indicated by the following:
m WARNING: Indicates that incorrect use may result in
service injury or loss of life.
m CAUTION: Indicates that incorrect use may result in
service injury or property damage.
m WARNING:
1. Do not apply pressure greater than the maximum
allowable pressure. This may cause damage or rupture
the pressure element, resulting in injury or damage to the
surroundings.
2. Do not use this product to measure fluid which causes
gas/liquid contact area to corrode. This may cause dam-
age or rupture the pressure element, resulting in injury or
damage to the surroundings.
3. Do not apply excessive weight, vibration or shock. This
may cause damage or rupture the pressure element, result-
ing in injury or damage to the surroundings.
4. Use of a non-designated power source may cause fires or
electric shocks.
5. Use this device within the operating temperature range.
Using the instrument outside of the recommended operat-
ing temperature range may cause malfunction or damage
and result in injury or damage to the surroundings.
6. Perform wire connection according to the wire connection
faceplate or the wire connection instructions within the
instruction manual. Incorrect wiring may cause injury or fire.
7. Use explosion-proof product when required or explosive
gas exists; this is due to the potential of ignition or explosion.
8. Use instruments that have been properly cleaned and are
free of oil when the process media is oxygen. Standard
(uncleaned) product may contain oil; contact with oxygen
can result inignition and/or explosive reactions.
9. Perform installation according to the instruction manual.
10. Do not alter this product in any manner or form. In addi-
tion, do not disassemble this product. Contact Ashcroft
for repairs.
11. Since this product is a precision measuring instrument, it
is advised that the product be removed from all sources
of noise. Remove noise from the power source by using
noise filter, etc.
Table of contents:
1. INTRODUCTION ................................................................. 2
2. ATTENTION ......................................................................... 2
3. GENERAL DESCRIPTION .................................................. 2
4. OUTLINE DRAWINGS (Representative example)............ 2
5. PRECAUTIONS FOR USE
5-1. Transportation precautions....................................... 3
5-2. Unpacking precautions ............................................. 3
5-3. Mounting precautions................................................ 3
5-4. Storage precautions .................................................. 4
6. WIRING
6-1. Examples of wire connection & external connection .. 4
6-2. Load resistance.......................................................... 4
6-3. Specifications of the cable with M12 connector
(optional)............................................................................. 5
7. PRINCIPLE OF OPERATION.............................................. 5
8. ZERO AND SPAN CALIBRATION ...................................... 5
9. MAINTENANCE AND OPERATION
9-1. Maintenance ............................................................... 5
9-2. Adjustment ................................................................. 6
10. WARRANTY....................................................................... 7
11. OTHERS ........................................................................ 7

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 2
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
1. INTRODUCTION
Please double-check the specifications for the model that you
have received.
If specifications such as the pressure range, power source,
or output are incorrect, accidents can occur. Please be sure
to use a model that is appropriate for your specifications, in a
location which is appropriate for your usage environment, and
which has been correctly wired and installed.
2. ATTENTION
Ashcroft shall have no liability for failure, product issue, or
physical injury resulting from the following:
• Modification and repair performed by any non-Ashcoft
personnel.
• Product issue caused by product of another company
• Misuse of product instructions, instrument operation and/
or not observing conditons/methods stipulated within the
instruction manual.
• Natural disasters, such as fire, seismic activity, water/flood
damage, lightning, etc.
3. GENERAL DESCRIPTION
This pressure transmitter is developed for the semiconductor
industry. In contrast to conventional transmitters, this product
offers a compact and lightweight design. Pressure is converted
into electric signals and transmitted by the sensing portion
equipped with strain gauges and a built-in electronic circuit.
4. OUTLINE DRAWINGS: MVT - 9⁄16 -18 UNF (compatible with
¼ VCR®) Male Flow Through
OUTLINE DRAWINGS: FVS - 9⁄16 -18 UNF (compatible with
¼ VCR®) Female Swivel
.87
[22]
2.13
[54]
M12X1 - 4 PIN
ELECTRICAL
TERMINATION
9
⁄
16
-18 UNF
(compatible with ¼ VCR
®
)
Male Flow Through (MVT)
.79
[20]
.50
[12.6]
2.63
[66.8]
1.86
[47.2]
.39
[10]
0.32
8.2
Ø 0 .79
[20]
Ø 1.00
[25.4]
.18
[4.5]
.59
[15]
.59
[15]
2XM3
.197 [5]
M12X1 - 4 PIN
ELECTRICAL
TERMINATION
9
⁄
16
-18 UNF
(compatible with ¼ VCR
®
)
Female Swivel (FVS)
0.32
[8.2]
Ø 1.00
[25.4]
0.50
[12.6]
1.86
[47.2]
2.74
[69.5]
Ø
.79
[20]
0.76
[19.2]
3.55
[90.1]
0.18
[4.5]
Notes:
Red Die Line Does Not Print
Ink: PMS 360
Printing Stock: Pressure Sensitive Aluminized Mylar
File Name: ZT12- Label_RevA_04-13-22_Dim_Dwg
ZT12- Label _W-UK_RevB_10-11-22_Dim_Dwg
RANGE : – 0.1~20 MPa
POWER : 10~30 Vdc
OUTPUT : 4~20 mA dc
(0.25) EP
DATE :11.2022
No. :1234567
ZT12
62 mm
34.5 mm

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 3
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
OUTLINE DRAWINGS: MVF - 9⁄16 -18 UNF (compatible with
¼ VCR®) Male Fixed
OUTLINE DRAWINGS: MVS - 9⁄16 -18 UNF (compatible with
¼ VCR®) Male Swivel
5. PRECAUTIONS FOR USE
5.1 Transportation Precautions
m CAUTION:
This is a precision measuring instrument.
Do not drop or impact when transporting as
shock may cause damage and render the
instrument inoperable.
5.2 Unpacking Precautions
•Check packaging appearance prior to unpacking.
• Carefully handle and do not drop unit carton.
m CAUTION:
• Open instrument’s sealed bag in a clean
environment. Do not expose Pressure
Transmitter’s gas contact parts to moisture,
dust, etc.
• Upon unpacking, inspect unit to verify that
the model type and physical appearance are
correct and free from damage.
• Contact distributor or Ashcroft if any
abnormality has been identified with the
product.
5.3 Installation Precautions
(1) ZT12 pressure transmitter is equipped with a union
connection that is compatible with a VCR fitting. For
installation, make sure to use hexagonal flats to tighten
fitting. Do apply force to the unit enclosure when attached
to the pressure line.
(2) This product has protection class IP67 (connector mat-
ing state/JIS C 0920).
For longer-term operation, select a location that is not
exposed to direct sunlight, condensation, dust, oil or water. In
addition, please pay particular attention to the following during
installation.
• Do not drop or impact unit as shock may
render unit inoperable.
• Do not install product in an environment
exposed to vibration, impact, direct sunlight
or dust.
• Use product in ambient temperatures
between -4° to 158°F (-20° to 70°C)
• Allow for space around the instrument for
maintenance and adjustment.
• Do not touch or breathe on the gas contact
parts, while taking care not to damage the
Indicates that incorrect use may result in
service injury or loss of life.seat surface.
m CAUTION: • Do not apply excessive force to the
enclosure during installation.
M12X1 - 4 PIN
ELECTRICAL
TERMINATION
9
⁄
16
-18 UNF
(compatible with ¼ VCR
®
)
Male Fixed (MVF)
.32
[8.2]
.50
[12.6]
1.86
[47.2]
2.61
[66.3]
.63
[16]
Ø 0.79
[20]
Ø 1.00
[25.4]
.87
[22]
.18
[4.5]
M12X1 - 4 PIN
ELECTRICAL
TERMINATION
9
⁄
16
-18 UNF
(compatible with ¼ VCR
®
)
Male Swivel (MVS)
0.50
[12.6]
0.32
[8.2]
1.86
[47.2]
2.29
[58.2]
Ø 1.00
[25.4]
Ø 0
.79
[20]
0.63
[16]
3.69
[93.7]
0.18
[4.5]

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 4
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
m WARNING:• Take care not to block the air inlet on the top
of the instrument (Refer to 4. Outline draw-
ings). Unit will not provide prescribed perfor-
mance if the air inlet is obstructed/blocked.
• Do not apply excessive force or excessive
bending to the cable once the connector
is attached to the product and the mating
connector.
• Snoop test of the sensor part should be
avoided as this may cause an insulation
resistance defect.
• Prior to commencing operation, it is
recommended to purge the unit with
sufficient inert gas. This will remove any
atmospheric component, particles, and/or
foreign matter within the pipe
5.4 Storage Precautions
• To avoid failure or damage, do not store
product under the following conditions:
• Do not expose to water
• Susceptible to adverse effects due to air
pressure, temperature, humidity, ventilation,
sunlight, particles, salt or sulfur in the air
m CAUTION: • Do not expose to inclination, vibration or
shock (including during transportation)
• Do not expose to chemicals (chemicals’
storage area) or gas
• Do not expose to direct sunlight or high
temperature
• Deformation and discoloration of resin parts
may occur when product is stored in a
sealed bag under high temperature and high
humidity environments.
6. WIRING
6.1 Wiring schematic of mating connector
Wire connection and external connection should be carried
out as follows.
Insert the cable with M12 connector (optional) while aligning
to the connector groove on the instrument. Hand-tighten
until the nut does not move. [Tightening torque: 0.4 to 0.5N•m]
6.2 Load Resistance
Refer to the following chart for relationship between load
resistance and power supply voltage.
When connecting equipment that can generate surge from the
same power supply, it is recommended that a voltage-depen-
dent resistor (varistor) be connected to the pressure transmitter
for protection. In addition, take the following precautions when
wiring:
• Do not pull or bend the cable with excessive
force.
• When mounting, check the specification rat-
ing of the product and determine the power
supply rating to be used. Once the product
load resistance has been verified, use the
CONNECTOR
TERMINAL ARRAY TERMINAL ARRAY 2-WIRE SYSTEM CABLE COLOR
1 Power Source + Brown
2 — White
3 Power Source - Blue
4 — Black
Power Supply & Load Resistance
Operating Range
Power Supply (Vdc)
R Lmax R Lmin
Load ResistanceΩ
1000
900
800
700
600
500
400
300
200
100
0
8 10 12 14 16 18 20 22 24 26 28
30
Maximum load resistance
Minimum load resistance
RLmax E (V)-10(V) (Ω)
0.02(A)
RLmin E (V)-26.4(V),RLmin ≥o(Ω)
0.02(A)
Power
Source [+]
Power
Source [–]
[Connector: 1]
[Lead: Brown]
Connector
C
A
+ -
Receiver
15 to
24 Vdc
4-20 mA dc
[Lead: Blue]
[Connector: 3]
ZX11 Non-Hazardous Area
ZT12

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 5
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
connected device’s internal resistance with-
in its rated range.
m CAUTION:
• When soldering, take care that the soldering
iron does not touch the sheath of the case
or cable.
• Product protection class IP67 may be
impaired if the tightening nut for the cable to
the M12 connector (optional) proves insuffi-
cient. Be sure to tighten securely to counter
possible vibration; tightening torque: 3.54 to
4.43 in. lb.
Do not not perform any wiring procedures
when powering the unit.
6.3 Specifications of the cable with M-12 connector
(optional)
If using a connector that has not been supplied by Ashcroft,
please make sure your connector meets the following
specifications.
• The cable is comprised of a 4-wire system
mCAUTION: (white, black, blue, brown), however, the
white and black wires are not used.
7. Principle of Operation
The transmitter’s sensing diaphragm converts pressure to an
electrical signal by use of strain gages. The circuit is a full-
bridge system where the strain gages are positioned on all
four bridge sides and detect the amount of strain. An electrical
signal, in proportion to the strain amount, is then amplified to a
specific value by the electrical circuit and transmitted as direct
current output.
Block diagram (4 to 20mA DC/2-wire system)
8. Zero and Span Calibration
1) Prior to powering the unit, double-check to make sure all
wires have been properly connected. Verify that voltage
and amperage ratings of the power supply and internal
resistance of the external adaptation equipment are within
the rated range of the instrument’s load resistance. Lastly,
re-confirm that the pressure transmitter has been installed
within an operating environment that complies with the
explosion-proof specification.
(2) Zero adjustment can be performed once the unit has been
powered for a 15-minute warm-up period. Zero adjustment
can be performed by removing the rubber plug located at
the top of the enclosure. Refer to “9-2. Adjustment” (below)
to adjust properly.
Observe the following precautions
while operating:
• Do not apply any pressure above that refer-
enced on the product’s label.
• Do not adjust wiring or insert/remove the
connector while the device is powered, as
this may damage the device and/or cause
an electric shock. All wiring should be con-
nected in accordance to the product wiring
diagrams.
• If used with corrosive gas, it is highly
recommended that the pressure transmitter
be fully purged with nitrogen gas prior to
being removed for maintenance or other
servicing. Leaving corrosive gas within a
device will accelerate corrosion by forming
strong acid or alkaline substance generated
internally by moisture or oxygen within the
atmosphere.
9. Maintenance and Adjustment
9.1 Maintenace
Routine inspection should be conducted at least once every
6 months with device recalibration or zero adjustment being
performed as necessary. Product should only be inspected by
properly trained personnel.
CONNECTOR
TERMINAL ARRAY PUR Cable (Oilproof) PVC Cable (Stainless Nut)
Straight
L Type
Material
(1) Zinc die-casting
(nickel-plated)
(2) TPU (Green)
(3) PUR (Black)
1) Stainless-steel
(2) PP (White)
(3) PVC (Gray)
Cable Length (L) 3 m or 5 m 3 m or 5 m
Conductor Cross
Section 0.34 mm2(22AWG) 0.34 mm2(22AWG)
Core Diameter
Including Insulation 1.27 mm 1.26 mm
External Cable
Diameter 4.7 mm 4.7 mm
* The protection structure of the cable with M-12 connector is protection class IP67
or higher in a mating state.
m CAUTION:
m WARNING:

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 6
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
• Zero and span adjustment are performed
by rotating zero/span potentiometer with
resin or ceramic Phillips screwdriver. Be
careful not to mistake the position and
orientation of each adjustment.
• Avoid placing an excessive load [within 5N,
10 sec.] on the zero/span adjustment poten-
tiometer as this can lead to damage.
• Be extremely careful not to cause a short
circuit with the screwdriver.
• Use properly calibrated and traceable
instrumentation to verify adjustments.
(1) Zero adjustment
Zero adjustment is performed by rotating zero/span adjust-
ment potentiometer shown in the figure (Page 9) with Phillips
screwdriver.
Note: Refer to the following directions as the adjustment
method for absolute and compound ranged products differ.
[Positive pressure range]
Be sure that the applied pressure to the sensor has been
returned to atmospheric pressure (no pressure) state; adjust
the sensor output at this time to 4 mA dc.
[Compound range]
Be sure that the applied pressure to the sensor has been
released to atmospheric pressure (no pressure) state; adjust
the sensor output at this time to the value calculated by the
following:
• Output 4 to 20 mA dc (current output)
[Output mA DC in atmospheric pressure state] = [16 mA dc]
/ ([Upper limit output in range (MPa)] - [-0.1 MPa]) x 0.1 +
[4 mA dc]
e.g. (0.5MPa, Compound range: 6.67 mA dc) / (1.0 MPa,
Compound range: 5.45 mA dc)
(Absolute range)
At vacuum (using a vacuum pump or other means) adjust the
sensor output to the approximate output value based on the
degree of vacuum you are able to achieve. Approximately 4mA
• Avoid putting an excessive load, >44 in. lb.,
10 sec., on the zero adjustment potentiome-
ters as this may result in damage.
m CAUTION:
m CAUTION:
m CAUTION:
m CAUTION:
m CAUTION:
Be sure to recalibrate the device using a set method or reca-
libration standards. Take special care not to effect the explo-
sion-proof performance of the instrument when inspecting in a
hazardous area. The following is a routine inspection checklist
for your reference and use
Routine Inspection Checklist
• Physical appearance (scratches, cracks, warping,
corrosion, etc.)
• Corrosion status of pressure inlet
• Clogging of the air inlet
• Leak test for the connection points and re-tightening of
connecting screw
• Check and tighten all instrument screws
• Insulation resistance between each terminal and case
(at 100MΩ or more/50 Vdc or less)
• Output check by a pressure reference device and measuring
instrument
• Avoid electrostatic discharge.
• Use a soft cloth moistened with water to
only clean the external parts of the instru-
ment. Do not use thinner, benzene, etc.
which cause deterioration and failure.
9.2 Adjustment
Remove the rubber plug (tethered plug) mounted at the side of
the enclosure.
• The rubber plug is equipped with a simple
tethering function, however if it is pulled
too strongly, it may be damaged. Please
be careful not to use more force than
necessary [<17 in. lb.].
• Do not attempt adjustments if product is
wet. Do not allow water to enter the product
as this can lead to damage and/or
accidents.
• Make adjustments once the product has
been powered and allowed to warm up for
15 minutes (recommended 30 minutes).
*
!

© Ashcroft Inc. 2022, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. ZT12_Transducer_I&M011-10307_RevA_11-16-22 7
Installation and Maintenance Instructions
for ZT12 High Purity Transmitter
The “Z” on the rubber plug indicates the position of the poten-
tiometer for zero adjustment, and the “S” indicates the position
of the potentiometer for span adjustment.
• Ensure rubber plug has been returned to
its original position to retain product
protection class integrity. Protection class
may be impaired if the rubber plug is not
firmly affixed.
10. WARRANTY
If the delivered products within the warranty period (within one
year from the delivered date) are determined to be non-con-
forming products according to “Defects due to the design or
manufacturing”, they are repaired or replaced with conforming
products free of charge.
However, note that the following cases are excluded.
(1) Where the delivered products are disassembled, altered or
where their parts are replaced or new function is add by the
customer or any third party
(2) Where directions described in the instruction manual or
catalog are not observed.
(3) Where the non-conformance is caused by deterioration due
to use, natural disaster, fire or other force majeure events
(4) The secondary damage caused by non-conformance of the
products including the above.
Returned units are subject to evaluation by Ashcroft prior to
determining warranty.
m CAUTION:
11. OTHERS
This instruction manual is not intended to cover all equipment
and/or installation and maintenance details. Please contact
Ashcroft if additional detail is sought, or in the event that the
instrument does not adequately serve your company’s intentions.
Additionally, this instruction manual may be changed, at
any time, without prior notice for the purposes of version
upgrades, revisions etc.
Thank you for your understanding and cooperation.
After the adjustment, please be sure to attach the rubber plug
by referring to the figure below.
Gasket Seal
Do not bite the fall-
prevention portion.
< Fig. 11-2 >
>
Locked
Insert the resin cap straight into the direction
shown in the figure so that it does not bite the
fall-prevention portion.
Lock the resin cap by
turning it 90° clockwise
while pushing it lightly.
Opened
Fall Prevention
Opened Locked