Setra AccuSense ASL Operating Manual

AccuSenseTM Model ASL

High Performance Low-Dierential Pressure Transducer

Installation Guide

DESCRIPTION

The AccuSense™ Model ASL 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 ASL has been tested and calibrated before shipment. Specic
performance specications are shown on page 3 of this Guide. Setra Sys­tems ASL pressure transducers sense dierential pressure and convert this
pressure dierence to a proportional high level analog output. Voltage
outputs of 0-5VDC or 0-10VDC, or current output of 4 to 20 mA are oered.

2.0 MECHANICAL INSTALLATION

2.1 Media Compatibility

Model ASL transducers are designed for use with gases compatible
with 300 series and 17-4 stainless steel on Process port. Clean dry gas is
required for connection to Reference port.

2.2 Environment

The operating temperature limits of the ASL 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 Fitting Description: Process Port / Ref Port

1F 1/8” NPT Female / Barb

FF 1/8” NPT Female / 1/8”-27 NPT Female

1M 1/4” NPT Male / Barb

J7 7/16”- 20 SAE Male / Barb

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2.4 Installation of Pressure Fittings

Your transducer is designed for most accurate operation when subjected
to pressures within the designated pressure range. Refer to the catalog
bulletin specications for proof pressure limits.

Standard sealants such as Teon 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 eect does not appreciably aect
linearity or sensitivity. The wrench at on the ASL series must be used
when installing the positive pressure tting.

3.0 ELECTRICAL INSTALLATION

3.1 Electrical Connections

ASL is available with cable version or bayonet connector options having
dierent connector pin outs shown in table below:

3.2 Voltage Output Units

The Model ASL voltage units are four-wire type circuit with 0-5VDC or
0-10VDC analog output.

3.3 Current Output Units

The Model ASL 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 ows into the + terminal and returns back to the power supply
through the - terminal (See Diagram 1). The power supply must be a DC
voltage source with a voltage range between 9 and 30 measured between
the + and - terminals. The unit is calibrated at the factory with a 24 VDC
loop supply voltage and a 250 ohm load.

Diagram 1

+

ASL

9 to 30 VDC

Current
Monitoring
Device

_

2

Electrical Data

Signal Output Ranges 0-5 VDC, 0-10 VDC (4-wire), 4-20mA (2-Wire)

Nominal Excitation 24 VDC

Excitation Range 9-30V DC (5V DC & 4-20mA output)

15-30V DC (10V DC Output)

Current / Power Consumption <20mA (Voltage Version), <22mA (4-20mA Version)

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

Warm-up, Environmental Within +/-.02%FS after 15min Warm-up Time

Miswiring Reverse Excitation Protection

WIRING CODES

Code B3

(Standard)

Electrical

Connection

+ 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

SecureCal™ Blue E E E E

SecureCal™ Brown F F F F

Wire
Color

Reserved for communication with SecureCal

Bayonet

Connector Pinout

Code B4

Option

Bayonet

Connector Pinout

Code B5

Option

Bayonet

Connector Pinout

TM

calibration module

Code B6

Option

Bayonet

Connector Pinout

Connector

Viewed from Front

4.0. CALIBRATION

The ASL transducer is factory calibrated and should require no eld adjust­ment if mounted in a vertical position. Whenever possible, any zero and/
or span osets should be corrected by software adjustment in the user’s
control system. However, ne zero and span adjustments can be made
through use of SecureCal™ accessory for calibration access. The Model ASL
transducer zero oset is trimmed in the vertical position (pressure ports
pointing downward) prior to shipping from factory.

4.1 Zero/Span Adjustments with SecureCal™

To make secure zero and span adjustments, attach SecureCal™ accessory
to ASL pressure transducer. (See Diagram 2).

4.2 Zero Adjustment (Current Output)

While applying zero pressure, zero may be adjusted by pressing the send
button to tare zero. If ne adjustment is needed on analog output, turn
the encoder wheel until desired compensation is seen on display (if 0.0025

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