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850152-01
IM-P693-08
EMM Issue 2
LP40
High Integrity,
Self-monitoring Low Level Alarm Probe
Installation and Maintenance Instructions
1. Safety information
2. General product information
3. Installation
4. Wiring
5. Probe clearance test
procedure
6. Maintenance
7. Spare parts
8. Technical assistance
LP40 High Integrity, Self-monitoring Low Level Alarm Probe
© Copyright 2020
1
IM-P693-08 EMM Issue 2
Printed in Germany
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Summary of Contents for Spirax Sarco LP40
- Page 1 1. Safety information 2. General product information 3. Installation 4. Wiring 5. Probe clearance test procedure 6. Maintenance 7. Spare parts 8. Technical assistance LP40 High Integrity, Self-monitoring Low Level Alarm Probe © Copyright 2020 IM-P693-08 EMM Issue 2 Printed in Germany...
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Page 2: Safety Information
1.1 Intended use The Level probe LP40 is designed for use in conjuction with the Spirax Sarco low water level switch LCS3050. If used in conjuction with other controllers then a safety power supply unit that delivers a Safety Extra Low Voltage (SELV) must be used to supply the controller/probe. - Page 3 In normal use the external surface of the product may be very hot. Many products are not self- draining. Take due care when dismantling or removing the product from an installation. LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 4 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.
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Page 5: General Product Information
2. General product information 2.1 General description The Spira x Sarc o LP40 level probe is used with the Cable Spira x Sarc o LCS3050 level switch to provide a high socket integrity, self-monitoring low level alarm signal, usually in a steam boiler. -
Page 6: Installation
Two separate protection tubes must be provided, one for each LP40 probe. Typical protection tubes and installation examples are shown in Figures 3, 4 and 5. Dimensions and construction may be varied to suit the application, but a tube of at least 80 mm (3") diameter is recommended. - Page 7 Boiler shell 20 mm (¾") vent hole as high as possible Minimum Ø 80 mm 20 mm (¾") Fig. 3 Typical protection tube LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 8 * The lowest water level should be higher than the zero point of the water level measurement Reducer K88.9x30x3.2 Fig. 4 Installation example 1: Inside the boiler with protection tube provided by the customer LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 9 * The lowest water level should be higher than the zero point of the water level measurement Reducer K114.3x28x4 Fig. 5 Installation example 2: Combination with capacitance level probe LP21 LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 10 45° from the vertical. The low alarm switching level is at the extreme end of the probe tip, which is cut to length to give the required alarm level. LP40 probe tips are retained by a thread, pin and lock-nut: Earlier probes were retained by two pins only.
- Page 11 (galling/picking up). If damage has occurred replace the probe. Dipped length Fig. 7 LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 12 To gain access to the connector block within the cable socket, remove the central screw and withdraw the hinged cover. The connector block on the LP40 maybe rotated in 90° steps to facilitate wiring: Remove the retaining screw and withdraw socket.
- Page 13 LP40 connector Ensure that resistance from the probe body to boiler shell is less than 1 Ω. Internal link Fig. 9b Comparator tip Low alarm tip LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 14 Standards require that the probe tip has at least 14 mm (9/16") clearance. This test confirms that the LP40 probe is installed correctly. The test must be done on initial installation, and each time the probe is removed from the boiler, e.g. for annual inspection.
- Page 15 (19/16") deeper internally than the end of the probe, see Figure 10). Fig. 11 Pinch together (to relax coil) for fitting to probe tip Maximum 10 mm (3/8") 90° Side view End view 14 mm (9/16") Fig. 12 LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 16 Clearance 14 mm (9/16"): A signature in this box signifies the test has been successfully completed, verifying the tip clearance is greater than 14 mm (9/16"). The (competent) person who did the tests must sign this box. Date Reason for test LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
- Page 17 That the checking wires have been removed. That the record sheet has been correctly completed by a competent person. Verification Signatures Clearance Checking wires removed Independent assessor 14 mm (9/16") or more LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
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Page 18: Maintenance
Always order spares by using the description given in the column headed 'Available spares' and state for which product they are required. Example: 1 off Spring clearance checking set for a Spirax Sarco LP40 high integrity, self-monitoring low level alarm probe. -
Page 19: Technical Assistance
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: Your name, company name, address and telephone number, order number and invoice and return delivery address. - Page 20 Spirax Sarco Ltd Runnings Road Cheltenham GL51 9NQ United Kingdom www.spiraxsarco.com LP40 High Integrity, Self-monitoring Low Level Alarm Probe IM-P693-08 EMM Issue 2...
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