Setra AccuSense ASM Operating Manual
AccuSenseTM Model ASM
High Performance Pressure Transducer
Installation Guide
DESCRIPTION
The AccuSenseTM Model ASM pressure transducer is a high performance pressure transducer designed for accurate, reliable pressure measurements. It has a
high level analog output signal, excellent stability, and secure calibration which
makes it ideal for high performance industrial, laboratory, and engine test cell
applications.
1.0 GENERAL INFORMATION
Every Model ASM has been tested and calibrated before shipment. Specific
performance specifications are shown on page 3 of this Guide. Setra Systems
ASM pressure transducers sense gauge, absolute, or vacuum gauge pressure and
convert this pressure difference to a proportional high level analog output. Voltage outputs of 0 to 5VDC or 0 to 10VDC, and current output of 4 to 20 mA are
offered.
2.0 MECHANICAL INSTALLATION
2.1 Media Compatibility
Model ASM transducers are designed for use with gases and liquids compatible
with 17-4PH stainless steel.
2.2 Environment
The operating temperature limits of the ASM are -40°C to +85°C (-40°F to
+185°F)
The compensated temperature range is -20°C to +60°C (-4°F to +140°F)
2.3 Pressure Fittings
Available pressure fittings are given in table below:
Pressure Fitting Code Fitting Description
1F 1/8”-27 NPT Female
1M 1/8”-27 NPT Male
2F 1/4”-18 NPT Female
2M 1/4”-18 NPT Male
J7 7/16”- 20 SAE Male
1
2.4 Installation of Pressure Fittings
Your transducer is designed for the most accurate operation when subjected to
pressures within the designated pressure range. Refer to page 4 for proof pressure limits.
Standard sealants such as Teflon pipe tape generally are satisfactory on NPT
threads. For the most sensitive pressure ranges, excessive high torquing of a
metal pressure fitting may cause slight zero shift which may be trimmed out
using the zero adjustment. Use of a plastic fitting often shows no noticeable zero
shift. The torquing effect does not appreciably affect linearity or sensitivity. The
3/4 in. wrench flat (Hex) on the unit must be used when installing the positive
pressure fitting.
3.0 ELECTRICAL INSTALLATION
3.1 Electrical Connections
ASM is available with a cable, or bayonet connector options having different
connector pin-outs shown in table below:
Wiring Codes Code B3
(Standard)
Electrical Connection
Cable Wire Color Bayonet
Connector
Pinout
Code B4
Option
Bayonet
Connector
Pinout
Code B5
Option
Bayonet
Connector
Pinout
Code B6
Option
Bayonet
Connector
Pinout
+EXC Red A A A C
-EXC Black D B B D
+Sig Out Green B C D A
-Sig Out White C D C B
Reserved for communication with SecureCalTM calibrtion module.
TM
SecureCal
SecureCal
TM
Blue E E E E
Brown F F F F
CAUTION: Connecting -EXC to positive excitation and +Sig to negative excitation at the same time may damage the unit.
3.2 Voltage Output Units
The Model ASM voltage units are four-wire type circuit with 0-5VDC or 010VDC analog output.
3.3 Current Output Units
The Model ASM current units are a two-wire loop-powered 4 to 20mA current
output and delivers rated current into any external load of 0 to 800 ohms.
The current flows into the + terminal and returns back to the power supply
through the - terminal (See Diagram 1). The power supply must be a DC voltage
2
source with a voltage range between 9 and 30 VDC measured between the +
and - terminals. The unit is calibrated at the factory with a 24 VDC loop supply
voltage.
3.4 Cable for Bayonet Connectors
For good EMC performance, shielded cable shall be used and grounded to earth
ground. Cable shall only be used within a building and not be longer than 30 m
(100 ft.).
+
ASM
9 to 30 VDC
_
Diagram 1
Current
Monitoring
Device
Electrical Data
Signal Output Ranges 0-5 VDC, 0-10 VDC (4-wire); 4-20mA (2-Wire)
Nominal Excitation 24 VDC
Excitation Range 9-30 VDC (5 VDC & 4-20mA output)
15-30 VDC (10 VDC Output)
Current Consumption <23mA
Circuit Response Time <10ms (Voltage Version),
<80ms (4-20mA Version)
Warm-up, Environmental Within +/-0.02%FS after 15 min. Warm-up Time
Miswiring Reverse Excitation Protection
4.0. CALIBRATION
The ASM transducer is factory calibrated and should require no field adjustment if mounted in a vertical position. Whenever possible, any zero and/or span
offsets should be corrected by software adjustment in the user’s control system.
However, fine zero and span adjustments can be made through use of Secure-
TM
Cal
accessory (purchased separately) for calibration access. The Model ASM
transducer zero offset is trimmed in the vertical position (pressure port pointing
downward) prior to shipping from factory.
4.1 Zero/Span Adjustments with Secure-Cal
TM
To make secure zero and span adjustments, attach SecureCalTM accessory to
ASM pressure transducer. (See Diagram 2).
4.2 Zero Adjustment
While applying zero pressure, zero offset may be adjusted by pressing the
send button to tare zero. If fine adjustment is needed on analog output, turn the
3
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