Setra Systems 760 User manual

Model 760
Operating Instructions
Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com

2
Table of Contents
1.0 Introduction....................................................................................................................3
2.0 Mechanical installation ................................................................................................ 4
3.0 Electrical installation ..................................................................................................... 6
4.0 Operation........................................................................................................................ 7
5.0 Calibration and adjustment of zero output.................................................................10
5.1 Checking & adjustment of zero output...................................................................10
5.2 Span (full scale) adjustment and calibration.........................................................10
6.0 Maintenance & troubleshooting..................................................................................11
7.0 Specications...............................................................................................................12
8.0 Reordering data............................................................................................................13
9.0 Returning products for repair...................................................................................... 14
10.0 Warranty & limitation of liability................................................................................14
11.0 Form 760 ERN - return of Setra Systems product-declaration............................... 15

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1.0 Introduction
Setra’s Vactron Model 760 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
specied in Torr (mmHg), mBar (hPa), kPa or psia.
The Model 760 operates from a ±15 VDC power supply and provides a 0-10 VDC or 0-5 VDC signal
output that is linear with pressure and independent of gas composition. Electrical connections
can be either the industry standard 15 pin D-sub or 6 position terminal strip connector. The
Model 760 is pin for pin compatible with other 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 760 has
an integrated sliding cover providing easy access to multi-turn potentiometers for ne zero
and span adjustments. Inconel is used for all wetted materials for compatibility with corrosive
gases. A wide range of pressure/vacuum ttings are available.
The high accuracy pressure sensing element used in the Model 760 is the Vactron™ sensor,
which has been developed from Setra’s patented 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 unique custom integrated circuit utilizing a patented charge balance principle.
Excellent zero stability and barometric insensitivity is achieved through the patented sensor
design. The Model 760 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.

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2.0 Mechanical installation
Remove all packaging material and the protective flange cover and visually check the Model
760. If the Model 760 appears damaged, notify Setra Systems or your supplier immediately.
Retain packaging materials for inspection. Do not use if damaged. If the Model 760 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 -50 to +125°C.
The Model 760 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 760 (which may cause
measurement errors), we recommend that you install the Model 760 vertically with the tube
facing down. Outline drawings showing the external dimensions are shown in Figures 1 - 4.
To connect the Model 760 to your system use the appropriate hardware for the type of tting:
• Use a Cajon® Ultra Torr type of compression coupling to connect to the
0.5” OD tube.
• Use an O-ring/centering ring and clamp to connect to the NW16, 25 and
40 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 8 VCR™ style face seal tting and sealing washer to connect to the female
swivel 8 VCR™ style face seal tting.
• Use a male 0.5” Swagelock™ tting/union to connect to the 0.5”
Swagelock™ nut tting.
• Use an O-ring and clamp to connect to the 1.5” Triclover™ style sanitary flange.
Note: Tighten threaded ttings in accordance with the manufacturer’s specications.
Figure 1: Outline drawing of 15 pin D connector, 0.5” OD tube.
SLIDING INSERT EXTENDS
APPROX. .40" TO REVEAL
USER ADJ. ACCESS HOLES
(SPAN & ZERO)
15 PIN
mm.
in.
SUB-D CONNECTOR
S Z
2.36
60
2.3
58
1.25
32
0.2
5
2.36
60
0.5
12.7

5
Figure 2: Outline drawing of screw terminal connector
(6 position), 0.5” OD tube.
USER ADJ. ACCESS HOLES
(SPAN & ZERO)
6-WAY
APPROX. 0.4" TO REVEAL
SLIDING INSERT EXTENDS
S Z
PCB HEADER,
in.
mm.
FREE PLUG, 6-WAY
SCREW TERMINAL
2.36
60
2.36
60
1.25
32
2.3
58
0.73
18.5
0.18
4.5
0.5
12.7
Figure 3: Outline drawing showing optional ISO NW vacuum tting.
NW16
1.18
NW25
1.58
1.45
NW40
2.16

6
Figure 4: Outline drawing showing optional VCR™ style face seal
vacuum tting.
1 1/16"
ACROSS FLATS
1/2" FEMALE FACE GLAND
2.05
2.43
0.88
3.0 Electrical installation
The model 760 operates from a ±15 VDC regulated (±5%) power supply. The model 760 has
either a 0-5 VDC output or 0-10 VDC output.
The pin out for the D-sub, 15 pin connector is shown in Figure 5, page 6. A schematic diagram
of the recommended electrical connections to the D-sub, 15 pin connector is shown in Figure
6, page 6.
The pin out for the 6-position screw terminal connector is shown in Figure 7, page 7. A schematic
diagram of the recommended electrical connection to the 6-position screw terminal connection
is shown in Figure 8, page 7.
Note 1: 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 transducer.
Note 2: To ensure optimal EMC performance when installed, an overall metal braided shielded
cable (and metal shielded connectors for the D sub connector option) connected to chassis
ground at both ends is required.

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4.0 OPERATION
For most accurate pressure measurement, allow the Model 760 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 760 is linear with pressure; e.g., for a 10 VDC FS Model 760, 10
VDC equals 100% FS output, 1 VDC equals 10% FS output.
Table 1 indicates the lowest pressures available for reading and pressure control for each
range of the Model 760. The lowest suggested pressure available for reading is limited by the
resolution and the accuracy of the Model 760. This is directly related to the electrical noise on
the signal output and can be signicantly 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 signal output of 50 mV.
Table 1: Recommended lowest pressures
Available for reading & pressure control
Full scale range
Recommended lowest
pressure reading
Recommended lowest
pressure for control
10 Torr 0.005 Torr 0.05 Torr
20 Torr 0.010 Torr 0.10 Torr
50 Torr 0.025 Torr 0.25 Torr
100 Torr 0.050 Torr 0.50 Torr
200 Torr 0.100 Torr 1.00 Torr
500 Torr 0.250 Torr 2.50 Torr
1000 Torr 0.500 Torr 5.0 Torr
10 mbar / hPa 0.005 mbar / hPa 0.05 mbar / hPa
100 mbar / hPa 0.05 mbar / hPa 0.5 mbar / hPa
1000 mbar / hPa 0.5 mbar / hPa 5 mbar / hPa
1 psia 0.0005 psia 0.005 psia
2 psia 0.0010 psia 0.010 psia
5 psia 0.0025 psia 0.025 psia
10 psia 0.0050 psia 0.050 psia
20 psia 0.0100 psia 0.100 psia

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Figure 5: Pin out of D-sub connector (Code D2)
Figure 6: Electrical connection schematic – D-sub 15-pin connector
15 PIN
PIN 9
PIN 15
PIN 8 PIN 1
SUB-D CONNECTOR
S Z
+ve Signal Output
Chassis ground Shielded cable
1 .0 0 0 0 0V
0V
-15 VDC
-15 VDC
2
5
6
7
12
15
15 position D-Sub
Connector on
Model 760
Power Supply
Digital volmeter/
readout
+
Pin location Function
2 Signal output
5Power supply common
6Power supply, -15 VDC
7Power supply, +15 VDC
12 Signal output common
15 Chassis ground
1,3,4,8,9,10,11,13,14 Not used

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Pin location Function
1Power Supply Common
2 Signal Output Common
3 Signal Output
4Power Supply, -15 VDC
5Power Supply, +15 VDC
6 Chassis Ground
Figure 7 : Pin out of screw terminal connector (Code T2):
Figure 8 : Electrical connection schematic - screw terminal connector
6-WAY
S Z
PCB HEADER,
PIN 1
+ve Signal Output
Chassis ground Shielded cable
1 .0 0 0 0 0V
0V
-15 VDC
-15 VDC
3
1
4
5
2
6
6 Position Screw
Terminal Connector
Model 760
Power Supply
Digital volmeter/
readout
+

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5.0 Calibration & adjustment
5. 1 Checking & adjustment of zero output
After installation on a system, the Model 760 may require initial zero adjustment. Figure 9 shows
the location of the zero adjustment potentiometer. Slide open the black plastic insert to reveal
two access holes. The access hole next to the raised “Z” on the plastic cover identies the
zero potentiometer.
Use an accurate digital voltmeter to view the signal output of the Model 760. Adjust the signal
output of the model 760 to be 0.001 to –0.001 mV. Make this adjustment at a pressure at least
1/2 decade below the Model 760’s resolution; e.g., for a 10 Torr FS unit the zero pressure should
be less than 5E-4 Torr . For a 1000 Torr unit, a pressure less than 0.050 Torr is sufcient.
The Zero potentiometer is a multi–turn potentiometer providing very ne adjustment of the
zero over a +/- 500 mV range.
Figure 9 : 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 certied reference standard and should only be attempted by
qualied personnel. Return the Model 760 to Setra Systems for periodic calibration, span (full scale)
adjustment and calibration adjustments and servicing.
SPAN ZERO
S Z
Slide out plastic insert to
end stop to reveal access
holes to the zero and span
potentiometers.
Use small flat bladed screwdriver to
adjust the zero (Z).
Clockwise to increase;
Counter-clockwise to decrease signal

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6.0 Maintenance & troubleshooting
There are no general maintenance requirements for the Model 760 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 760 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
specied in Section 2.
Readout display short circuit or
incorrect impedance
Ensure impedance of readout unit is
>10k
Signal output reads over
range
Incorrect wiring Ensure wiring conforms to diagrams in
Section 4.2
Potential difference between
chassis ground of unit, power
supply and readout/display
Ensure common chassis ground
between unit, power supply, and
display
Signal output reads
under range
Incorrect zero adjustment Adjust zero per section 5.1
Readout display incorrect impedance Ensure impedance of readout unit is
> 10kΩ
Incorrect wiring polarity to
readout display
Ensure wiring conforms to diagrams in
Section 4.2
Unstable signal supply Chassis ground not connected Ensure common chassis ground
between unit, power supply, and
display
Unstable or unregulated Use a regulated power supply as
specied in Section 2
Electrical noise on chassis ground Ensure common chassis ground
between unit, power supply, and
display

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Performance data
Accuracy1<±0.25% of reading; <±0.15% of reading (Opt)
Resolution 0.01% FS
Physical description
Case Aluminum alloy
Vacuum ttings 0.5” OD tube; other ttings available; see reorder data page
Wetted materials2Inconel®
Measurement cavity volume3<6 cm3
Weight <260 g
Electrical data
Connector 15 pin D sub or 6 position terminal strio
Excitation ±15V DC, regulated ±5%
Output 0-10 V DC or 0-5 V DC
Output maximum load <10 KΩ load
Power consumption <0.5 Watts (<15 mA)
Time constant <20 ms
EMC performance Complies with EMC directive 89/336/EEC
Thermal effects
Compensated range 0º to +50ºC
Zero shift < ±0.005% FS/ºC
Span shift < ±0.027% FS/ºC
Proof pressure 45 PSIA
Operating temperature 0 to +50°C
Storage temperature -50 to +125°C
1Root sum of the squares (RSS) of linearity, hysteresis and non-repeatability. Accuracy is expressed as % of reading.
However, near Zero, the accuracy is limited by the resolution of the instrument. So, the accuracy is more correctly stated
as the greater of ±0.25% reading or ±0.01% FS. (For the optional accuracy, this becomes the greater of ±0.15% reading
or ±0.01% FS).
2Wetted material is for 0.5” tube option only. Other flange options will add stainless steel.3±1.0% FS/yr for ranges <100
Torr full scale when operated at 80ºC
3Maximum cavity volume including the 0.5” OD tube volume of 0.26 in3(4.28 cm3).
Specications subject to change without notice.
7.0 Specications

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7 06 1
[1] [2] [4] [5] [6] [7][3]
Model
7601 760
[1]
Fitting
4T 0.5“OD tube
N1 ISO NW16
N2 ISO NW25
N4 ISO NW40
D8 8 VCR®, Int.
swivel
17 Mini
Conflat®
18 2.75"
Conflat®
4S 0.50
Swaglok®
T6 Tri-clover
1.50”
[4][3]
Pressure type
AAbsolute
[7]
Accuracy
A±0.25%
of reading
B±0.15%
of reading
[6]
Elec. termination
D2 15-pin D-Sub
T2 6 position screw
terminal
[5]
Output
7B 0-5 VDC
7C 0-10 VDC
[2]
Pressure range
001T 1 Torr
010T 10 Torr
020T 20 Torr
100T 100 Torr
10CT 1000 Torr
001M 1 mbar/hPa
010M 10 mbar/hPa
100M 100 mbar/hPa
10CM 1000 mbar/hPa
R02P 0.01 psia
002P 2.0 psia
020P 20 psia
0R1K 0.1 kPa
001K 1.0 kPa
010K 10 kPa
100k 100 kPa
8.0 Maintenance & troubleshooting
Example: To order a 10 Torr FS unit with ISO NW16 fitting, 0-10 VDC output, D sub
15 electrical connector and an accuracy of ±0.25% Reading, the order code would be:
7601010TAN17CD2A.

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9.0 Returning products for repair
Setra Systems cannot accept a Model 760 for repair unless the Form 760ERN is completes. Contact Setra Systems for an
ERN number or the form 760ERN. Form 760ERN is included in this guide on page 15.
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.
NOTES:
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.
10.0 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 notied in advance of and the product is returned to SETRA transportation prepaid.
Unless otherwise specied in a manual or warranty card, or agreed to in a writing signed by a SETRA ofcer, 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.

15
11.0 Return of Setra Systems product-declaration
(Form 760ERN)
Expected return number_________________________________________________________
You must:
• Know about all of the substances which have been used and produced in the product before
you complete this Declaration.
• Contact your supplier if you have any questions and for an ERN Number.
• Send this form to your supplier with the return of the product.
Section 1: Product
A. Model number ____________________________
B. Serial number _____________________________
C. Has the product been used, tested or operated?
Yes - Go to Section 2 No - Go to Section 4
Section 2: Substances in contact with the product
A. Radioactive* Yes No
B. Biologically Active Yes No
C. Dangerous to Human Health and Safety? Yes No
* Note: Your supplier will not accept delivery of any products that are contaminated with
radioactive substances, unless you:
• Decontaminate the products
• Provide proof of decontamination
YOU MUST CONTACT YOUR SUPPLIER FOR ADVICE BEFORE YOU RETURN SUCH PRODUCTS
If you have answered “no” to all of these questions, go to Section 4.
Section 3: List of substances in contact with the product
Section 4: Return information
Reason for return and symptoms of malfunction:_________________________________
_______________________________________________________________________
If you have a warranty claim:
• Who did you buy the product from?: ______________________________________________________
• Give the supplier’s invoice number or your purchase order number:_______________________
Section 5: Declaration
Print your Name:_______________________________ Print Your Job Title: ______________________
Print Your Company Name: _________________________________________________________________
Print Your Address: _________________________________________________________________________
Telephone Number: ____________________________ Date of Product Return:______________
I have made reasonable inquiry and I have supplied accurate information in this Declaration.
I have not withheld any information. I have followed the Return of Setra Systems Product
Procedure.
Signed: ______________________________________ Date:___________________________________
Substance name Chemical
symbol
Precautions required (e.g.,
use protective gloves, etc.)
Actions required after
spillage or human contact
1.
2.
3.
4.
5.
6.

Setra Systems, Inc.
159 Swanson Road, Boxborough, MA 01719
800.257.3872 • www.setra.com
SS2037 REV. F 10/2018