Spirax Sarco PA420 Installation And Maintenance Instructions Manual

4 - 20 ma loop powered level preamplifier

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IM-P402-139

4026150/1

AB Issue 1

PA420

4 - 20 mA Loop Powered Level Preamplifier

Installation and Maintenance Instructions

1. Safety information

2. General

product information

3. Installation

4. Wiring

5. Commissioning

6. Maintenance

7. Fault finding

8. Technical data

IM-P402-139 AB Issue 1

Printed in the UK

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Summary of Contents for Spirax Sarco PA420

Page 1 IM-P402-139 4026150/1 AB Issue 1 PA420 4 - 20 mA Loop Powered Level Preamplifier Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Installation 4. Wiring 5. Commissioning 6. Maintenance 7. Fault finding 8. Technical data © Copyright 2013 IM-P402-139 AB Issue 1 Printed in the UK...
Page 2 IM-P402-139 AB Issue 1...
Page 3: Safety Information
1. Safety information Safe operation of the product depends on it being properly installed, commissioned and maintained by a qualified person (see Section 1.11) in compliance with the operating instructions. It is essential to comply with general installation and safety instructions for pipeline and plant construction, as well as to make proper use of tools and safety equipment.
Page 4: Intended Use
This product is suitable for Heavy Industrial Environments. A fully detailed EMC assessment has been made and has the reference number UK Supply BH PA420. The product may be exposed to interference above the limits of Heavy Industrial Immunity if: The product or its wiring is located near a radio transmitter.
Page 5: Pressure Systems
1.9 Tools and consumables Before starting work ensure that you have suitable tools and/or consumables available. Use only genuine Spirax Sarco replacement parts. 1.10 Protective clothing Consider whether you and / or others in the vicinity require any protective clothing to protect against the hazards of, for example, chemicals, high / low temperature, radiation, noise, falling objects, and dangers to eyes and face.
Page 6: Residual Hazards
1.16 Returning products Customers and stockists are reminded that under EC Health, Safety and Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk.
Page 7: General Product Information
2.1 Description The PA420 preamplifier is a loop powered level transmitter for use with a Spirax Sarco capacitance probe. It outputs 4 - 20 mA current signal, proportional to the water level in a tank or boiler.
Page 8: Installation
Fit the 'O' ring supplied with the unit to the base of the male thread on the capacitance probe. Note: Both the probe and the PA420 are provided with an 'O' ring - fit only one of these. Fit the preamplifier to the probe and hand tighten only.
Page 9 (See Figure 3). The PA420 earth terminal is for the connection of the screen only. It provides a sink / drain for any electrical interference rather than a protective earth. A protective earth provides protection from electric shock under a single fault condition.
Page 10 5.1 Water level calibration The PA420 can be configured to output between 4 mA and 20 mA for a range of water levels. The product can output 20 mA at a high water level and 4 mA for a low water level.
Page 11: Maintenance
Use of other cleaning materials could damage the product and invalidate the warranty. Boiler water level controls - Require regular testing and inspection. For specific testing instructions for Spirax Sarco systems please see separate literature. IM-P402-139 AB Issue 1...
Page 12: Fault Finding
7. Fault finding WARNING: Before commencing fault finding, read the Safety information in Section 1 Introduction The most likely time for faults to occur is during installation and commissioning. 7.1 Generic faults Symptom Explanation Action Check that the ambient temperature is within specification - See Section 8.2.
Page 13: System Alarms
The alarm can be cleared by power cycling the product, once the fault is corrected Symptom Explanation Action Return product to your local Spirax Sarco representative. Program integrity Light flashing Before installing a The product program has replacement product, follow been corrupted.
Page 14: System Errors
7.3 System errors When an error occurs, the light will flash red. To assist in diagnosis, the light will flash in a continuous sequence, separated with a pause. The error can be cleared by pressing one of the buttons. The product will continue to output a current proportional to water level, with the parameters currently saved in memory.
Page 15 Monitor, data log and record stopped and recovered the supply voltage over a red 6 times automatically. period of time. repeatedly If the problem persists, return the product to your local Spirax Sarco representative.  PA420 Preamplifier V  Screen Loop +...
Page 16: Technical Data
/delivery documentation or on our web site: www.spiraxsarco.com Returning faulty equipment Return all items to your local Spirax Sarco representative. Ensure all items are suitably packed for transit (preferably in the original cartons). Please provide the following information with any equipment being returned: 1.