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Instrumentation designed
with the user in mind
Instruction Manual
Princo Model L3541
Remotely Adjustable Point Level Controller
with NULL-KOTE™
Rev 2, 18 July 08
P R I N C O I N S T R U M E N T S I N C . , 1 0 2 0 I N D U S T R I A L B L V D . , S O U T H A M P T O N , P A 1 8 9 6 6
PHONE: 800-221-9237 or 215-355-1500
FAX: 215-355-7766
WEB SITE:
www.princoinstruments.com
E-Mail:
info@princoinstruments.com
__________________________________________________________________________
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Summary of Contents for PRINCO L3541
- Page 1 ___________________________________________________________________________________ Instrumentation designed with the user in mind Instruction Manual Princo Model L3541 Remotely Adjustable Point Level Controller with NULL-KOTE™ Rev 2, 18 July 08 P R I N C O I N S T R U M E N T S I N C . , 1 0 2 0 I N D U S T R I A L B L V D . , S O U T H A M P T O N , P A 1 8 9 6 6...
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Page 2: Table Of Contents
Functional Description ......................... 1 1.2.1 Basic Features ............................1 L850, L860 & L870 Series Probes ....................3 SPECIFICATIONS ......................5 L3541 Level Controller ........................ 5 L850, L860 & L870 Series Probes ....................5 INSTALLATION....................... 6 Inspection ............................. 6 Mounting ............................6 3.2.1... - Page 3 Figure 3-5. Electrical Connections – 115Vac & 230Vac Units ................10 Figure 3-6. Electrical Connections – 24Vdc Units ....................10 Figure 3-7. Typical Remote System ........................11 Figure 4-1. L3541 Adjustment and Indicator Locations ..................12 Figure 4-2. Adjustment Procedure – Conductive Process Materials..............14 Figure 4-3. Adjustment Procedure – Non-conductive (Insulating) Process Materials..........15...
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Page 4: Description
– a Sensor Head and a Control Unit (see Figure 1-1). The Sensor Head is a modular electronic chassis, The Model L3541 is part of a new generation of point which is contained within a heavy duty, cast level control switches that incorporates advanced aluminum, weatherproof, explosion-proof housing. - Page 5 STATUS LED. The two-color (red/green) LED change in electrical impedance occurs between is located in the Control Unit of the L3541. the probe and the metal storage vessel wall. (For Green indicates material contacting the probe;...
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Page 6: L850, L860 & L870 Series Probes
The time delay feature is useful when process Relay Test Function material wave action causes the control relay to The L3541 Control Unit has a TEST push- continually change state. It can also be used to button, which, when pushed, checks the suit a particular control timing application. -
Page 7: Figure 1-2. Standard L853 Probe, Dimensional Drawing
The "active" element The L854 and L870 Probes have built-in ground contacts the L3541 circuit board by means of the references and are referred to as "dual element" spring-loaded pin projecting from the top of the probes. -
Page 8: Specifications
Section Two: Specifications • RELAY TEST FUNCTION 2 Specifications The L3541 Control Unit has a TEST push- button, which, when pushed, checks the operation of the control relays and any device • driven through them. This function may also be... -
Page 9: Installation
The ground return rod must be electrically connected 3 Installation to the L3541 Sensor Head’s housing or to the ground position of the terminal block (TB2) with 18 AWG or heavier wire. See Figures 3-5 and 3-6. See Figure 3- 4 for ground continuity testing. -
Page 10: Sensor Head
See figure 3-8 below. The spring-loaded Figure 3-3. Spring-loaded Pin & Guard Spring pin is the electrical connection between the sensing Model L3541 Instruction Manual Page 7 of 18 Rev 2, 18 July 08... -
Page 11: Electrical Connections
HEAD 3.3.1 Control Unit TERMINAL TERMINAL (TB1) (TB2) Open the cover of the L3541 Control Unit in preparation for connection of input and output +9.5 volt dc TB1-10 black wires. Before drawing wires into the equipment supply enclosure, it may be necessary to remove the... -
Page 12: Ground Continuity Test
1. Point A (posts) to point B (housing). 2. Point B to point C (hub of probe). 3. Point C to point D (except in non-metallic tank). Test Figure 3-4. Ground Continuity Model L3541 Instruction Manual Page 9 of 18 Rev 2, 18 July 08... -
Page 13: Figure 3-5. Electrical Connections - 115Vac & 230Vac Units
Section Three: Installation Figure 3-5. Electrical Connections – 115Vac & 230Vac Units Figure 3-6. Electrical Connections – 24Vdc Units Model L3541 Instruction Manual Page 10 of 18 Rev 2, 18 July 08... -
Page 14: Installation In Hazardous Areas
WARNING! area. Water drain seal fittings eliminate or minimize The Princo Model L3541 Level Control is not to be the effect of water that tends to collect in the conduit considered an explosion-proof instrument. The or enclosure due to condensation. -
Page 15: Adjustments And Operation
1. Refer to Figure 4-1 for L3541 adjustment and indicator locations. Figure 4-1. L3541 Adjustment and Indicator Locations from the L3541 metal housing to the metal wall of the vessel used. Whether adjustments are made under simulated The Coarse (C) and Fine (F) sensitivity (SENS) pots... -
Page 16: Adjustment Procedure - Non-Conductive (Insulating) Process Materials
NOTE potentiometers are properly adjusted. Horizontal probe mounting is preferred (see Section 3.2.2). The procedure must be done with the L3541 properly installed in the intended storage tank, and with the intended process material. All or most of the probe may need to be covered. The angle between the adjustment marks may be quite small with non- conductive process materials. -
Page 17: Figure 4-2. Adjustment Procedure - Conductive Process Materials
The PROBE STATUS LED potentiometers are properly adjusted. should now be green (probe immersed in same Figure 4-2. Adjustment Procedure – Conductive Process Materials Model L3541 Instruction Manual Page 14 of 18 Rev 2, 18 July 08... -
Page 18: Alarm Action
“alarm” state when its internal control relay is de- energized. Hence, if the unit lost power, the internal control relay would de-energize, and an “alarm” The L3541 is in the normal “non-alarmed” state condition would occur. when its control relay is energized. The unit is in the... -
Page 19: Delay Operations And Adjustments
(on/off) is factory configured in the standard L3541 unit. Although the L3541 is not designed as a zone controller, it may be used as such in some non- A single turn TIME DELAY pot is provided on the conductive applications. -
Page 20: Equipment Service
If the unit fails any of the above checks, return the A progressively thicker coating may be building L3541 electronic chassis to the factory for repair or up on the probe. This would result in a narrower replacement. -
Page 21: Getting Help
If your Princo equipment is not functioning properly, and attempts to solve the problem have failed, contact the closest Princo sales representative in your area, or call the factory direct and ask for service assistance. The factory telephone number is 1-800-221-9237.
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