ASHCROFT KS Sanitary Pressure Transducer Instruction Manual

ASHCROFT KS Sanitary Pressure Transducer

WARNING! READ

BEFORE INSTALLATION

1. GENERAL:
   A failure resulting in injury or damage may be caused by excessive overpres- sure, excessive vibration or pressure pulsation, excessive instrument temperature, corrosion of the pressure containing parts, or other misuses. Consult Ashcroft lnc., Stratford, Connecticut, USA before installing if there are any questions or concerns.

2. OVERPRESSURE:
   Pressure spikes in excess of the rated overpressure capability of the transducer may cause irreversible electrical and/or mechanical damage to the pressure measuring and containing elements.
   Fluid hammer and surges can destroy any pressure transducer and must al- ways be avoided. A pressure snubber should be installed to eliminate the dam- aging hammer effects. Fluid hammer occurs when a liquid flow is suddenly stopped, as with quick closing solenoid valves. Surges occur when flow is sud- denly begun, as when a pump is turned on at full power or a valve is quickly opened.
   Liquid surges are particularly damag- ing to pressure transducers if the pipe is originaly empty. To avoid damaging surges, fluid lines should remain full (if possible), pumps should be brought up to power slowly, and valves opened slowly. To avoid damage from both fluid hammer and surges, a surge chamber should be installed.
   Symptoms of fluid hammer and surge’s damaging effects:

   • Pressure transducer exhibits an output at zero pressure (large zero offset).
   • Pressure transducer output remains constant regardless of pressure
   • In severe cases, there will be no output.
     FREEZING:
     Prohibit freezing of media in pressure port.
     Unit should be drained (mount in vertical position with electrical termination upward) to prevent possible overpressure damage from frozen media.

3. STATIC ELECTRICAL CHARGES:
   Any electrical device may be susceptible to damage when exposed to static electrical charges. To avoid damage to the trans- ducer observe the following:

4. Ground the body of the transducer BEFORE making any electrical connections.

5. When disconnecting, remove the ground LAST!
   Note: The shield and drain wire in the cable (if supplied) is not connected to the transducer body, and is not a suitable ground.

Mounting
Although the unit can withstand normal vi- bration without damage or significant output effects, it is always good practice to mount the transducer where there is minimum vibration. Be sure to use a gasket that does not interfere with the sanitary diaphragm. If the gasket I.D. is smaller than 1.50 inches, an offset due to clamping force will occur.

Power Supply
The supply voltage for the 1-5 and 1-6 Vdc output transducers must be within the range of 10 to 36 Vdc. The maximum supply voltage for a 4-20mA current output transducer is 36 Vdc while the minimum supply voltage is dependent upon the loop resistance of the circuit. The Load Limitation Chart shows the minimum supply voltage (Vmin) required for a given loop resistance (RLoOP).
Excitation (Ratiometric Output Only)
For proper operation a voltage within the range of 5 to 10 Vdc must be applied between the transducer’s supply terminals.

Noise
For minimum noise susceptibility, avoid running the transducer’s cable in a con- duit that contains high current AC power cables. Where possible avoid running the cable near inductive equipment.
Shield Wiring
Connect the braided shield to the guard terminal on the reading instrument (meter, etc.) if available or to ground or to the power supply negative terminal.

Adjustment Potentiometers
The zero and span pots are accessible through the top of the case. Loosen the four screws and separate the top carefully.
The zero pot is marked with a white dot.

Vent Tube
The cable will have a clear Teflon vent tube that’s required at pressure below 500 psi to provide atmospheric reference. The open end should be placed in a dry area.

Dimensions

KS Sanitary Transducers – Electrical Conn.

Voltage Output Units 1-5, 1-6 Vdc

Ratiometric (mV/V)

Current Output Units 4-20 mA

Wiring Diagrams for All Transducers

4-Wire Ratiometric (mV/V)

3-Wire Voltage

2011 Ashcroft InC., 250 East Main Street, Stratford, CT 06614, USA Tel: 203-378-8281, Fax: 203-385-0402
email: info@ashcrfoft.com, www.ashcroft.com.
All specifications subject to change without notice. All sales subject to standard terms and conditions of sale. l&M011-10124 (250-3110) Rev. A 5/11

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