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PRINCO L2631 Instruction Manual

Two-wire continuous level transmitters with null-kote
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Instrumentation designed
with the user in mind
Rev 1, 7 Jul 02
INSTRUCTION MANUAL
PRINCO MODELS L2631 & L2631R
TWO-WIRE
CONTINUOUS LEVEL TRANSMITTERS
with NULL-KOTE™
PRINCO INSTRUMENTS INC.
1020 INDUSTRIAL BLVD.
SOUTHAMPTON, PA 18966
TEL: 800-221-9237
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 L2631

  • Page 1 Instrumentation designed with the user in mind INSTRUCTION MANUAL PRINCO MODELS L2631 & L2631R TWO-WIRE CONTINUOUS LEVEL TRANSMITTERS with NULL-KOTE™ PRINCO INSTRUMENTS INC. 1020 INDUSTRIAL BLVD. SOUTHAMPTON, PA 18966 TEL: 800-221-9237 215-355-1500 FAX: 215-355-7766 WEB SITE: www.princoinstruments.com E-MAIL: Rev 1, 7 Jul 02...

  • Page 2: Table Of Contents

    Figure 1-3. Typical 1" NPT Mounted Probe (Model L101) Figure 1-4. Typical 3" Flange Mounted Probe (Model L127) Figure 1-5. Typical Dual Flexible Probe (Model L115) Figure 3-1. Probe Mounting Locations Figure 3-2. L2631 Wiring Connections Figure 3-3. L2631 Wiring Diagram with 24 Vdc Power Supply...
  • Page 3 Figure 3-5. Ground Isolation Jumper Location Figure 3-6. Ground Isolation Figure 3-7. L2631 FM Approval Drawing Figure 4-1. Operational Checkout Figure 4-2. Control and Indicator Locations, L2631/L2631R Figure 4-3. Ground Continuity and Probe Checks Tables Table 4-1. Percent of Range to Current Conversion Table...

  • Page 4: Section 1. Description

    24 Vdc regulated power supply and Princo Model S939 Intrinsic Safety Barriers. The L2631/L2631R is capable of "driving" any current sensing, 4 to 20 mA device with an input impedance of 500 ohms or less.
  • Page 5 Signal Processing The L2631/L2631R is factory set on the appropriate RF capacitive measurement range as required for the specific application, based on a calculated capacitance span. Normally, the range is not re-set in the field. The RF signal, proportional to level and corrected for coating error, is rectified and filtered into a proportional DC voltage.
  • Page 6 Model S954 Analog Meter Typically scaled to read 0 to 100% of range span relative to a 4 to 20 mA input. Suitable for panel mounting or can be mounted in a weatherproof housing. Refer to Princo drawing #A90-S954 CD1 for dimensional details.
  • Page 7 Section One Description Figure 1-1 L2631 Dimensional Drawing Figure 1-2 L2631R Dimensional Drawing...

  • Page 8: L100 Series Probes Description

    Probe sheathing (Teflon, Kynar, or bare) is chosen with regard to chemical compatibility, as well as probe response and ability to withstand abrasion. All Princo continuous level probes connect to their respective electronic units by means of a 1" NPT threaded hub. The "ground" contact is made by the threads themselves. The "active"...
  • Page 9 Section One Description Figure 1-3 Typical 1" NPT Mounted Probe (Model L101) Figure 1-4 Typical 3" Flange Mounted Probe (Model L127) Figure 1-5 Typical Dual Flexible Probe (Model L115)

  • Page 10: Section 2. Specifications

    Section Two Specifications A. Specifications 1. L2631 & L2631R TWO-WIRE CONTINUOUS LEVEL TRANSMITTERS • TYPE Continuous, RF Impedance sensing, two-wire, level to current transmitter. • SPAN RANGE From 0.5 to 100 ft. typical. Shorter spans available with special probes. Consult factory.

  • Page 11: 2. L100 Series Probes

    • FM APPROVAL L2631 is FM approved as intrinsically safe, with entity, for use in Class I, II and III, Division 1, Groups C, D, E, F and G hazardous (classified) locations in accordance with Drawing No. A60-L2631-2, Rev 0 (see Figure 3-7).
  • Page 12 2. Temperature Limits: Bare or Teflon covered probes: -300ºF (-184ºC) to 500ºF (260ºC); Kynar covered probes: -40ºF (-40ºC) to 300ºF (149ºC). temperatures beyond these limits, consult factory. • SELECTION GUIDE / PHYSICAL DIMENSIONS Refer to Princo Bulletin L-96-4, Continuous Probe Selection Guide...

  • Page 13: Section 3. Installation

    Installation A. Inspection The L2631/L2631R transmitter is supplied with one of the Princo L100 Series level probes. The transmitter and probe are shipped in separate packages. Carefully remove each package's contents and check each item against the packing list. Inspect each item for shipping damage.
  • Page 14 Section Three Installation create artificially high level readings. Mounting in a vortex created by a mixer might give an atypically low reading. Figure 3-1 Probe Mounting Locations...
  • Page 15 Flange or NPT Mounting Princo L100 Series probes are normally mounted by means of a flange (typically two or three inch insertion hole diameter) or an NPT type fitting (standard size is one inch).

  • Page 16: L2631 Electrical Connections

    Electronic Housing Mounting The electronic chassis of the L2631 is contained within a cast aluminum housing. It is mounted onto the top of the probe by threading the housing's bottom NPT opening onto the probe hub's 1"...
  • Page 17 Figure 3-3 outlines a typical overall system wiring using a 24 Vdc power supply. To achieve ultra-stable operation, apply power and allow a 15-minute warm-up time prior to calibration. Refer to Section 4 for required adjustments. Figure 3-2 L2631 Wiring Connections...

  • Page 18: L2631R Electrical Connections

    Section Three Installation Figure 3-3 L2631 Wiring Diagram with 24 Vdc Power Supply D. L2631R Electrical Connections The Model L214 tri-axial cable connects the probe to the L2631R electronic chassis through two three-connection terminal blocks. One is located on the circuit board of the L216 Sensor Head.

  • Page 19: Intrinsically Safe Installation

    Installation E. Intrinsically Safe Installation Making the L2631 safe when operating in a hazardous area requires the use of Intrinsic Safety Barriers which must be installed following a strict installation code. The recommended Intrinsic Safety Barrier is the Princo Model S939 which is manufactured by R. Stahl Inc. (Stahl Type 9002/13-280-110-00).
  • Page 20 Section Three Installation Figure 3-6 Ground Isolation...
  • Page 21 Figure 3-7: L2631 FM Control Drawing...

  • Page 22: Section 4. Adjustments And Operation

    C. Initial Checkout 1. Install the L2631 or L2631R per the information presented in Section 3 of this manual. 2. Apply power to the unit and allow a 15-minute warm-up time before performing the operational checkout of the equipment.
  • Page 23 Read and record the corresponding output current for each dipsticked level position. Convert the actual level, from each dipstick reading, into a percentage of the calibrated L2631/L2631R span. This number is known as “Percent Level” or “Percent Range”.

  • Page 24: Calibration Procedure

    Figure 4-1 Operational Checkout D. Calibration Procedure If it is determined that the pre-calibrated L2631/L2631R is not within acceptable accuracy limits, then the unit requires a complete field calibration. Refer to Figure 4-2 for adjustment potentiometers (pots) and indicators locations. Proceed as follows: 1.
  • Page 25 Section Four Adjustments and Operation Figure 4-2 Control and Indicator Locations, L2631/L2631R 4. Adjust the Coarse (C) ZERO pot for approximately 4 milliamps on the meter. Adjust the Fine (F) ZERO pot for exactly 4.00 milliamps. ALTERNATE METHOD: If the storage tank is too full and may not be emptied to the level noted above, an approximate zero adjustment may be established as follows.

  • Page 26: Diagnostic Indicators And System Troubleshooting

    A and B DIAGNOSTIC indicators are in the form of two red LED's on the top panel of the L2631/L2631R. Also below are procedures for checking ground continuity, for testing a probe for breached sheathing and for checking probe response.
  • Page 27 4 to 20 mA output over level span. • Princo level units are factory set for a specific capacitance range based on customer's Application Data Sheet. If more than one unit was ordered, be sure that the correct unit is being used with the application.
  • Page 28 Probe Response Check: If the L2631/L2631R output signal readings are erratic or non- linear, and if there is no indication of a poor ground or a breach in the Probe per a, b and c above, the below check can be performed to help isolate the problem.
  • Page 29 Ground Continuity and Probe Checks F. Field Re-setting of L2631/L2631R Measurement Range Models L2631 and L2631R are factory-set on a specific capacitance measurement range for the specific probe and process application. The range seldom needs to be reset in the field.

  • Page 30: Section 5. Equipment Service

    8. Person to contact at your Company 9. Return (Ship to) Address Princo level instruments are covered by a 10-year limited warranty. You will not be charged if it is determined that the problem is covered under warranty. Please return your equipment with freight charges prepaid.

This manual is also suitable for:

L2631r

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