Setra ASM Installation Guide

AccuSenseTM Model ASM

High Performance Pressure Transducer

Installation Guide

Description

The AccuSense
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.

TM

Model ASM pressure transducer is a high performance pressure transducer

1.0 General information

Every Model ASM has been tested and calibrated before shipment. Specic performance
specications 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 5 VDC or 0 to 10 VDC, and
current output of 4 to 20 mA are offered.

2.0 Electrical 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 ttings are given in table below:

Pressure port
code

1F 1/8”-27 NPT Internal

1M 1/8”-27 NPT External

2F 1/4”-18 NPT Internal

2M 1/4”-18 NPT External

J7 7/16”-20 SAE External

J8 7/16”-20 SAE Internal

Fitting description:
process port / ref port

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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 tting may

cause slight zero shift which may be trimmed out using the zero adjustment. Use of a plastic

tting 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 tting.

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:

Connector
Viewed from Front

Electrical
Connection

Current Voltage

+ EXC + EXC Red A A A C A D

- EXC - EXC Black D B B D C C

NA + Sig Out Green B C D A F B

NA - Sig Out White C D C B E A

Reserved for communication with SecureCalTM calibration module

SecureCal™ Blue E E E E B E

SecureCal™ Brown F F F F D F

Shield
drain wire

Wire
Color

Ex­posed

Code B3

(Standard)

Bayonet

Connector

Pinout

Case Case Case

Code B4

Option

Bayonet

Connector

Pinout

Code B5

Option

Bayonet

Connector

Pinout

Code B6

Option

Bayonet

Connector

Pinout

Code B7

Option

Bayonet

Connector

Pinout

Code B8

Option

Bayonet

Connector

Pinout

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 a four-wire type circuit energized thru +EXC and -EXC ter-

minal with 0-5 VDC or 0-10 VDC analog output through the +SIG Out and -SIG Out terminals.

3.3 Current Output Units

The Model ASM current units are a two-wire loop-powered 4 to 20mA current output and
deliver rated current into any external load of 0 to 800 ohms.

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The current flows into the +EXC terminal and returns back to the power supply through the

-EXC terminal (See Diagram 1). Note: The +SIG Out and -SIG Out terminals are not used.
The power supply must be a DC voltage 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.).

Diagram 1:

+

ASM

9 to 30 VDC

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

Current/Power consumption* <23mA

Circuit response time

Warm-up, environmental Within +/-0.02%FS after 15 min Warm-up Time

Miswiring Reverse Excitation Protection

9-30V DC (5V DC & 4-20mA output)
15-30V DC (10V DC Output)

<10ms (Voltage Version),
<80ms (4-20mA Version)

4.0. Calibration

The ASM transducer is factory calibrated and should require no eld 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, ne zero and span adjustments

can be made through use of Secure-CalTM 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

To make secure zero and span adjustments, attach SecureCal
transducer. (See Diagram 2).

TM

TM

accessory to ASM pressure

3