Model 730
Operating Instructions
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
1.0 Introduction
Setra’s Model 730 capacitance manometer is a temperature compensated, absolute pressure
transducer designed for accurate and repeatable vacuum measurements. Various full scale
ranges are available from 10 Torr up to 1000 Torr. The units of measurement may be specied
in Torr (mmHg), mBar, kPa, or PSIA.
The Model 730 operates from a 12-30 VDC power supply and provides a 0-10 VDC signal
output that is linear with pressure and independent of gas composition. It can also be supplied
with a 0-5 VDC output, which operates from 9-30 VDC power supply. The Model 730 is pin
for pin compatible with competitive capacitance manometers. Superior EMI/RFI performance
is achieved by the use of a metal case in conjunction with surge and ESD suppression
components and RFI ltering on the inputs and outputs. The Model 730 has easy access to
multi-turn potentiometers for ne zero adjustments. Inconel is used for all wetted materials
for compatibility with corrosive gases. A wide range of process connections are available.
The high accuracy pressure sensing element used in the Model 730 is Setra’s variable
capacitance sensor. A centrally located feedthrough assembly supports a circular electrode in
close proximity to the back surface of the diaphragm. Together, the electrode and diaphragm
form a variable capacitor within a small reference vacuum chamber. As the pressure increases,
the diaphragm deflects and the gap between the electrode and diaphragm reduces, causing
an increase in the capacitance. This change in capacitance is detected and converted to a
highly accurate linear DC electronic signal by Setra’s high frequency precision diode bridge
circuit.
Excellent zero stability and barometric insensitivity is achieved through the patented sensor
design. The Model 730 sensor contains no fragile or complex parts as found in ceramic based
capacitance manometers. The all welded construction eliminates stability issues inherent in
other designs due to frictional contact between dissimilar materials.
2.0 Mechanical installation
Remove all packaging material and the protective flange cover and visually check the Model
730. If the Model 730 appears damaged, notify Setra Systems or your supplier immediately.
Retain packaging materials for inspection. Do not use if damaged. If the Model 730 is not
going to be used immediately, then replace the protective flange cover and store in an area
where the temperature range is controlled between -20 to +85°C.
The Model 730 can be mounted in any orientation on the vacuum system. To avoid the buildup
of debris or condensible material in the measurement cavity of the Model 730 (which may
cause measurement errors), we recommend that you install the Model 730 vertically with the
tube facing down. Outline drawings showing the external dimensions are shown in Figure 1.
2
To connect the Model 730 to your system use the appropriate hardware for the type of tting:
• Use a Swagelock® Ultra Torr vacuum tting to connect to the O.5” or 0.25” OD tube.
• Use an O-ring/centering ring and clamp to connect to the NW16 or 25 flange options.
NOTE: A stepped O-ring carrier may be used to connect the NW16 flange to an NW10 flange
on the system.
• Use a Male 4 VCR™ or 8 VCR™ Face Seal Fitting and sealing gasket to connect to the female
swivel 4 VCR™ or 8 VCR™ Style Face Seal Fitting.
NOTE: Tighten ttings in accordance with the manufacturer’s specications.
Figure 1: Outline drawing of Model 730 with 9-pin D-sub and 0.5” and 0.25” OD
Tube.
Pin 1
0.12
[3.05]
1.50
[38.10]
2.06
[52]
0.99
[25]
0.50
[13]
Model 730 with 0.5” diameter tube Model 730 with 0.25” diameter tube
2.06
[52]
0.75
[19]
in.
[mm]
Pin 9
0.25
[6]
3
Figure 2: Outline drawing of Model 730 with 5-pin terminal strip and 0.5” and
0.25” OD Tube.
Pin 1
3.05
[77]
0.99
[25]
Pin 1
0.12
[3.05]
Mating connector
3.47
[87]
in.
[mm]
Terminal strip
1.50
[38]
3.17
[80]
0.75
[19]
0.25
0.50
[13]
Model 730 with 0.5” diameter tube Model 730 with 0.25” diameter tube
[6]
4
Figure 3: Outline drawing of Model 730 with 6” cable and 15-pin D-sub and 0.5”
and 0.25” OD Tube.
in.
Pin 1
Pin 15
[mm]
3.24
[82]
0.99
[25]
0.50
[13]
Model 730 with 0.5” diameter tube Model 730 with 0.25” diameter tube
0.75
[19]
5
3.0
[76]
0.25
[6]
3.0 Electrical installation
The model 730 operates from a 12-30 VDC regulated power supply for the 0-10 VDC output
version or from a 9-30 VDC regulated power supply for the 0-5 VDC output version. Either
version can be specied with a 5 Pin terminal strip, 9 Pin D-sub, or 15 Pin D-sub on a 6 inch
pigtail. Mating connectors are provided with the terminal strip version. The pinouts for each
option are shown in gures 4, 5, and 6, Page 6.
The ground of any external power supply and readout system should be the same as the
transducer ground (chassis ground) to minimize any possible ground loops, which may effect
the performance and stability of the system.
3.1 Wiring guidelines
The Model 730 is compliant with the Electro Magnetic Compatibility Directive 2004/108
EC, which tests for radio frequency emissions and immunity, provided the following wiring
guidelines are adhered to:
1. All interconnecting cables must have overall metal braid and foil shields covering all
wires and be properly grounded at each end.
2. The cable connectors must have a metal case and it must be in direct contact with the
cable braided shield for the entire circumference of the cable. A single wire from the
shield to the connector case will not be effective.
3. The connectors must make good contact, about 0.01 ohms, to the transducer’s case
(chassis).
4. Versions with the 5 pin terminal strip connector option must be used with a suitable
clamp on ferrite such as the Fair-rite part number 0461164281 which is included with
each unit. The ferrite should be assembled as close to the connector as possible to meet
CE EMI requirements.
WARNING: Class A equipment is intended for use in an industrial environment. Operation of
the equipment in other locations may cause harmful interference do to conducted as well as
radiated disturbances.
Fig. 4:
Pin out of
5-pin terminal strip
Pin Function
1 Power supply common
2 Signal output common
3 + Signal output
4 Case ground
5 Power supply
Fig. 5:
Pin out of 9-pin
D-sub connector
Pin Function
1 + Signal output
9 Power supply common
4 Power supply + VDC
8 Signal output common
2, 3, 4, 5, 6, 7 Not used
Pin Function
2 + Signal output
5 Power supply common
7 Power supply + 15 VDC
12 Signal output common
15 Chassis
1, 3, 4, 6, 8, 9,
10, 11, 13, 14
Fig. 6:
Pin out of 15-pin
D-sub connector
Not used
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4.0 Operation
For most accurate pressure measurement, allow the Model 730 to warm up for at least 15
minutes. After installation, periodically check the zero output reading to verify correct output.
Adjust the zero potentiometer if incorrect (See Section 5 for zero adjustment instructions).
The signal output of the Model 730 is linear with pressure; e.g., for a 10 VDC FS Model 730, 10
VDC equals 100% FS output; 1 VDC equals 10% FS output.
Table 1 indicates the lowest pressures recommended for reading and pressure control for
each range of the Model 730. The lowest suggested pressure for reading is limited by the
resolution and the accuracy of the Model 730. This is directly related to the electrical noise on
the signal output and can be signicantly effected by incorrect electrical ground connection,
or connection to an electronically noisy power supply or readout instrument. Improved results
may be obtained if the transducer is operated in an environment with stable temperature and
air flow. The lowest recommended pressure used for control applications, such as a closed
loop downstream pressure control system, is based on a minimal signal output of 50 mV.
NOTE: if the unit has been exposed to sudden environmental changes, allow at least 2 hours
before making any adjustments.
Table 1: Recommended Lowest Pressures
Available for reading and pressure control
Lowest recommended
Full scale range
10 Torr 0.005 Torr 0.05 Torr
20 Torr 0.010 Torr 0.10 Torr
100 Torr 0.050 Torr 0.50 Torr
200 Torr 0.100 Torr 1.00 Torr
1000 Torr 0.500 Torr 5.00 Torr
10 mbar 0.005 mbar 0.05 mbar
20 mbar 0.010 mbar 0.10 mbar
100 mbar 0.050 mbar 0.50 mbar
1000 mbar 0.500 mbar 5.00 mbar
1 kPa 0.0005 kPa 0.005 kPa
2 kPa 0.0010 kPa 0.010 kPa
10 kPa 0.0050 kPa 0.050 kPa
100 kPa 0.0500 kPa 0.50 kPa
pressure reading
Recommended lowest
pressure for control
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5.0 Calibration & adjustment
5.1 Checking & zero adjustment
After installation on a system, the Model 730 should be zeroed. Figure 7 shows the location of
the zero adjustment potentiometer.
NOTE: Before making adjustments be sure to allow the Model 730 to warm up and pump
down sufciently to the system base pressure. This time will vary depending on range and
system conductance. A minimum of 15 minutes is suggested.
Use a digital voltmeter to view the signal output of the Model 730. Adjust the signal output of
the model 730 to be 0.001 to –0.001 V. Make this adjustment at a pressure at least 1/2 decade
below the Model 730’s resolution; e.g., for a 10 Torr FS unit the zero pressure should be less
than 5E-5 Torr. For a 1000 Torr unit, a pressure less than 0.050 Torr is acceptable.
Figure 7: Location of calibration adjustment potentiometers
5.2 Span (full scale) adjustment and calibration
The Zero adjustment is the only adjustment that should be made in the eld. Span (Full
Scale) adjustments require a calibrated and certied reference standard and should only
be attempted by qualied personnel. Return the Model 730 to Setra Systems for periodic
calibration, Span (Full Scale) Adjustment and Calibration adjustments and servicing.
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6.0 Maintenance & Troubleshooting
There are no general maintenance requirements for the Model 730 other than periodic zero
adjustment. If the unit fails to operate when received or if the unit appears damaged, notify
Setra Systems or your supplier immediately. Retain packaging materials for inspection. Do
not use if damaged. If the Model 730 is not going to be used immediately then replace the
protective flange cover and store in suitable conditions described in Section 2.
If no obvious damage has occurred, a few simple checks can be made to verify proper
installation. Table 2 shows the solution to common problems with the installation. If none of
these problems/solutions are applicable, then please contact a Setra Systems applications
engineer for further assistance.
Table 2: Common Installation Problems & Solutions
Problem Cause Solution
No signal output Incorrect or no supply voltage Ensure power supply is used as
Readout display short circuit or
incorrect impedance
Signal output reads over
range
Signal output reads
under range
Unstable signal supply Chassis ground not connected Ensure common chassis ground
Incorrect wiring Ensure wiring conforms to diagrams in
Potential difference between
chassis ground of unit, power
supply and readout/display
Incorrect zero adjustment Adjust zero per section 5.1
Readout display incorrect impedance Ensure impedance of readout unit is
Incorrect wiring polarity to
readout display
Unstable or unregulated
power supply
Electrical noise on chassis ground Ensure common chassis ground
specied in Section 3.
Ensure impedance of readout unit is
>10k
Section 3.0
Ensure common chassis ground
between unit, power supply, and
display
> 10k
Ensure wiring conforms to diagrams in
Section 3.0
between unit, power supply, and
display
Use a regulated power supply as
specied in Section 3.0
between unit, power supply, and
display
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7.0 Specications
Performance data
Accuracy ±0.5% of reading; ±0.25% of reading (Opt)
Response time <20 ms
Resolution Innite, limited only by output noise level (≤0.005% FS)
Thermal effects
Compensated range 0º to +50ºC
Zero shift ±0.25% FS/50ºC
Span shift ±1.35% Rdg/ 50ºC
Long term stability 0.5% FS/1 YR, excluding environmental effects
Proof pressure 45 PSIA
Electrical data (voltage)
Excitation/Output
Current consumption <10 mA max
Output load >10 kΩ Load
Output impedance <1 ohm
Circuit 3-Wire
EMC performance Complies with EMC Directive 2004/108EC
Physical description
Pressure ttings See data sheet
Wetted material Inconel®
Electrical connection 5-Pin Screw terminal, 9-Pin D-Sub, or 15-Pin D-Sub on 6” pigtail
Case Stainless steel
Cavity volume <6.0 cc
Weight (approx.) <250 g
4
12 to 30 VDC for 0-10 VDC; 9 to 30 VDC for 0-5 VDC
Pressure media
Gases or liquids compatible with Inconel®. Inconel® wetted material is for 0.5” tube option only. Other tting
options will add stainless steel.
Environmental data
Operating temperature 0º to 80ºC
Storage temperature -20° to 85°C
Approvals
CE, RoHS
1
Includes non-linearity, non-repeatability and hysteresis
2
Units calibrated at nominal 66ºF. Maximum thermal error computed from this datum.
3
±1.0% FS/yr for ranges <100 Torr full scale when operated at 80ºC
4
Calibrated into a 50K ohm load, operable into a 5000 ohm load or greater
Specications subject to change without notice.
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8.0 Returning products for repair
Please contact a Setra application engineer (800-257-3872, 978-263-1400) before returning unit for repair to review
information relative to your application. Many times only minor eld adjustments may be necessary. When returning a
product to Setra, the material should be carefully packaged and shipped prepaid to:
Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719-1304
Attn: Repair Department
To ensure prompt handling, please supply the following information and include it inside the package or returned material:
• Name and phone number of person to contact.
• Shipping and billing instructions.
• Full description of the malfunctions.
• Identify any hazardous material used with the product.
Please remove any pressure ttings and plumbing that you have installed and enclose any required mating electrical
connectors and wiring diagrams.
Allow approximately 3 weeks after receipt at Setra for the repair and return of the unit. Non-warranty repairs will not be
made without customer approval and a purchase order to cover repair chargers.
Calibration Services
Setra maintains a complete calibrations facility that is traceable to the National Institute of Standards and Technology
(NIST). If you would like to recalibrate or recertify your Setra pressure transducers or transmitters, please call our Repair
Department at 800-257-3872 (978-263-1400) for scheduling.
NOTES:
9.0 Limited warranty & limitation of repair
SETRA warrants its products to be free from defects in materials and workmanship, subject to the following terms and
conditions: Without charge, SETRA will repair or replace products found to be defective in materials or workmanship within
the warranty period; provided that:
a) the product has not been subjected to abuse, neglect, accident, incorrect wiring not our own, improper installation
or servicing , or use in violation of instructions furnished by SETRA;
b) the product has not been repaired or altered by anyone except SETRA or its authorized service agencies;
c) the serial number or date code has not been removed, defaced, or otherwise changed; and
d) examination discloses, in the judgment of SETRA, the defect in materials or workmanship developed under normal
installation, use and service;
e) SETRA is notied in advance of and the product is returned to SETRA transportation prepaid.
Unless otherwise specied in a manual or warranty card, or agreed to in a writing signed by a SETRA ofcer, SETRA
pressure and acceleration products shall be warranted for one year from date of sale.
The foregoing warranty is in lieu of all warranties, express, implied or statutory, including but not limited to, any implied
warranty of merchantability for a particular purpose.
SETRA’s liability for breach of warranty is limited to repair or replacement, or if the goods cannot be repaired or replaced, to
a refund of the purchase price.
SETRA’s liability for all other breaches is limited to a refund of the purchase price. In no instance shall SETRA be liable for
incidental or consequential damages arising from a breach of warranty, or from the use or installation of its products.
No representative or person is authorized to give any warranty other than as set out above or to assume for SETRA any
other liability in connection with the sale of its products.
For all CE technical questions, contact Setra Systems, USA. EU customers may contact our EU representative Hengstler
GmbH, Uhlandstr 49, 78554 Aldingen, Germany (Tel: +49-7424-890; Fax: +49-7424-89500).
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Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
SS730 REV. C 1/2019
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