Setra Systems 760 Bedienungsanleitung
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 Specications...............................................................................................................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
3
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
specied 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.
4
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 specications.
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.
7
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 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 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
8
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
9
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
+
10
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 identies 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 sufcient.
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 certied reference standard and should only be attempted by
qualied 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
Inhaltsverzeichnis
Andere Setra Systems Messgerät Handbücher
Setra Systems
Setra Systems 370 Bedienungsanleitung
Setra Systems
Setra Systems DATUM 2000 Bedienungsanleitung
Setra Systems
Setra Systems Model 730 Bedienungsanleitung
Setra Systems
Setra Systems SRIMV Betriebsanleitung
Setra Systems
Setra Systems 761 Bedienungsanleitung
Setra Systems
Setra Systems Power Patrol Handbuch
Setra Systems
Setra Systems SS-SPM Bedienungsanleitung
Setra Systems
Setra Systems SRIM1 Bedienungsanleitung
Setra Systems
Setra Systems MRMS Bedienungsanleitung
Setra Systems
Setra Systems SRCM Installationshandbuch
