Alpha 165 Manuale utente
Installation Guide
Alpha Instruments Model 165
Differential Pressure Transducers
Every Model 165 has been tested and calibrated before shipment.
Alpha Instruments M165 pressure transducers sense differential or gauge (static) pressure and convert this
pressure difference to a proportional high level analog output for both unidirectional and bidirectional pressure
ranges. Three standard output versions are offered: Voltage output of 0 to 5 VDC, 0 to 10VDC and current
output of 4to 20mA.
Media Compatibility：
Model 165 transducers are designed to be used with air or nonconducting gases. Use with liquids or corrosive
gases will damage the unit.
Environmental Requirement：
Operating Temperature 0 ～170oF (-18 ～77℃)
Compensated Temperature Range 40 ～170 oF (4 ～77℃)
Temperature Drift ＜0.025%FS/oF (＜0.045%FS/℃)
Pressure Fittings：
The Model 165 is designed to be used with 3/16” I.D. push-on tubing. The positive (high) pressure port and the
reference (low) pressure port are labeled " + "and " - " respectively. For best results (shortest response times),
3/16” I.D. tubing is suggested for tubing lengths up to 80 feet (25 meters), 1/4” I.D. for tubing lengths up to 250
feet (75 meters), and 3/8” I.D. for tubing lengths up to 720 feet (220 meters).
Electrical Installation（Voltage Output）
：
The Model 165V is a 3-wire circuit, with three terminals available for wiring. These terminals have the
designation “ + ”, “ O ” and “ - “ (See Diagram 1). The power supply and signal references are commend on the
circuit (See Diagram 2).
The model 165V has a 0-5 or 0-10 VDC output. (See Diagram2).
The 165V can operate from 12-32VDC excitation. The unit is calibrated at the factory with a 24 VDC power,
50KΩload resistor.
"+"：Connect to positive terminalof DC power supply.
"O"：Connect to positive terminal of control or pressure
monitor.
"-"：Connect as the reference for power supply and
output signal.
Electrical Installation(Current Output)：
The Model 165C is a two-wire loop-powered 4 to 20mA current output unit and delivers rated current into any
external load of 0 to 1000 ohms. These terminals have the designation of “+” and “-“ (See Diagram 3). The
current flows into the + terminal and returns back to the power supply through the - terminal (See Diagram 4).
The 165C can operate from 12-32VDC excitation. The unit is calibrated at the factory with a 24 VDC loop supply
voltage and a 250ohm load.
The below table shows the maximum wire and receiver resistances as a function of supply voltage.
Vmin VmaxRmin RmaxRL at Supply Voltage (Vs)
12 32 0 1000 RL≤50(Vs-12)
For Example：Voltage is 24VDC，RL≤50(24-12)=600Ω，the load resistance should not exceed 600Ω。
Voltage Circuit Diagram
165V
+ EXC + OUT
EXC
Readout
or
DAS
Power
Supply
Dia
g
ram 1
Diagram 2
Current Circuit Diagram
165C
+ EXC
Current
Monitoring
Device
Power
Supply
EXC
4margaiD3margaiD
Calibration：
The 165 transducer is calibrated in vertical mounting position at the factory, there might be a zero shift when
using in other positions, zero adjustment is accessible under the small cap of the unit.
Zero Adjustment：
While monitoring the output of the unit and with both pressure ports open to atmosphere, the zero may be
adjusted by turning the zero adjustment screw to:
Voltage Output:
Unidirectional Pressure Ranges: 0VDC
Bidirectional Pressure Ranges: 2.5VDC or 5.0VDC
Current Output:
Unidirectional Pressure Ranges: 4mA
Bidirectional Pressure Ranges: 12mA
RETURNING PRODUCTS FOR REPAIR：
Please contact Alpha Instruments before returning unit for repair to review information relative to your application.
The material should be carefully packaged and shipped prepaid to:
Alpha Instruments Inc.
131 Nonset Path
Acton, MA 01720, USA
Attn: Repair Department
To assure prompt handling, please supply the following information and include it inside the package or
returned material:
1Name and phone number of person to contact
2Full description of the malfunction
3Identify any hazardous material used with product.
Notes: Please remove any pressure fittings and plumbing that you have installed and enclose any required
mating electrical connectors and wiring diagrams. Alpha Instruments will repair and return of the unit as
soon as possible. Non-warranty repairs will not be made without customer approval and a purchase order to
cover repair charges.
LIMITED WARRANTY AND LIMITATIONOF LIABILITY：
Alpha Instruments warrants its products to the original consumer purchase for a period of three years from the
date of sale, as shown in Alpha Instruments’ shipping documents.
Within the warranty period, Alpha Instruments will repair or replace products found to be defective in materials or
workmanshipfree of charge, if the following conditions meet:
a) the product has not been subjected to abuse, neglect, accident, incorrect excitation, improper installation or
servicing.
b) the product has not been repaired or altered by anyone except Alpha Instruments.
c) the serial number or date code has not been removed, defaced or otherwise changed.
d) Alpha Instruments is notified in advance of and the product is returned to Alpha Instruments transportation
prepaid.
Alpha Instruments’ 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. Alpha Instruments’ liability for all other breaches is limited
to a refund of the purchased price. In no instance shall Alpha 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
Alpha Instruments any other liability in connection with the sale of its products.
E-mail: sales@alphainstruments.com
SS165 Rev. 1
0
/
2007
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