Cerabar M PMC51

Summary

Product Identification

• Product Name: Cerabar M Analog
• Models: PMC51, PMP51, PMP55
• Function: Process pressure measurement
• Manufacturer: Endress+Hauser SE+Co. KG
• Software Version: Valid as of 01.00.zz

Designated Use

The Cerabar M is a pressure transmitter for measuring pressure and level.

Installation

General Instructions

• Devices with G 1 1/2 thread: Use flat seals; do not use hemp for sealing.
• Devices with NPT threads: Use Teflon tape for sealing. Tighten at the hexagonal bolt only.
  • Maximum torque for NPT threads: 20 to 30 Nm (14.75 to 22.13 lbf ft).
• For process connections ISO228 G1/2 and DIN13 M20 x 1.5, the maximum tightening torque is 40 Nm (29.50 lbf ft).
• Sensor modules with PVDF threaded process connections must be installed with the provided mounting bracket.
• The integrity of PVDF threads should be checked regularly and may need re-tightening to a maximum of 7 Nm (5.16 lbf ft). Teflon tape is recommended for sealing ½" NPT threads.

Mounting Configurations

• Devices without diaphragm seals (PMP51, PMC51):
  • Keep pressure compensation and GORE-TEX® filter free from dirt.
  • Recommended use of shutoff devices and siphons.
  • Mounting orientation depends on the measuring application.
  • Do not clean or touch process membranes with hard or pointed objects.
  • Pressure measurement in gases: Mount above the tapping point so condensate flows into the process.
  • Pressure measurement in steam: Preferably mount with an O-shaped siphon below the tapping point; fill siphon before commissioning. Observe maximum permitted ambient temperature.
  • Pressure measurement in liquids: Mount below or at the same level as the tapping point.
  • Level measurement: Always install below the lowest measuring point; avoid fill flow, points affected by agitator pulses, and pump suction areas.
• Devices with diaphragm seals (PMP55):
  • Installation method depends on the diaphragm seal type (screwed, flanged, or clamped).
  • Capillaries must be mounted vibration-free, with a bending radius of ≥ 100 mm (3.94 in), and insulated if ambient temperature deviates significantly from the reference temperature. Do not use capillaries as a carrying aid.
  • The diaphragm seal and transmitter form a sealed, calibrated system; do not open the filling hole.
• Wall and pipe mounting (optional): A mounting bracket is available for pipe diameters from 1 ¼" to 2". Nuts on the bracket should be tightened uniformly to at least 5 Nm (3.69 lbf ft).
• "Separate housing" version:
  • Mounting bracket suitable for pipe and wall mounting (pipe diameters 1 ¼" to 2").
  • Tighten nuts uniformly to at least 5 Nm (3.69 lbf ft).
  • Mount the cable with a bending radius (r) ≥ 120 mm (4.72 in).
• Version XSJ (prepared for diaphragm seal mount): Welding recommendation for fillet weld: 1 mm depth, 16 mm outer diameter, using WIG method.

Post-Installation Check

• Verify device is undamaged.
• Confirm device complies with measuring point specifications (process temperature, pressure, ambient temperature, measuring range).
• Check measuring point identification and labeling.
• Ensure adequate protection against precipitation and direct sunlight.
• Verify mounting screw and securing clamp are tightened.

Electrical Connection

General Instructions

• Switch off supply voltage before connecting.
• When used in hazardous areas, comply with applicable national standards, regulations, and safety instructions.
• A suitable disconnector must be installed.
• Devices with integrated overvoltage protection must be grounded.
• Protective circuits for reverse polarity, HF influences, and overvoltage peaks are integrated.
• Use twisted, shielded two-wire cable.
• Tighten cable glands to be leak-tight.

Connection Types

• 4 to 20 mA analog output:
  • Supply voltage: 11.5 to 45 V DC (35 V DC for versions with plug-in connector).
  • Connection terminals for supply and signal.
  • Test terminals allow measurement of the 4 to 20 mA signal without interrupting operation. A current measuring device should have an internal resistance of < 0.7 Ω for measurement error < 0.1%.
• Terminals:
  • Supply voltage and internal ground: 0.5 to 2.5 mm² (20 to 14 AWG).
  • External ground terminal: 0.5 to 4 mm² (20 to 12 AWG).
• Cable specification:
  • Recommended: Twisted, shielded two-wire cables.
  • Cable outer diameter: 5 to 9 mm.
• Load: Maximum load resistance (RLmax) depends on supply voltage (U) according to the formula: RLmax = (U – 11.5 V) / 0.023 A.
• Shielding/potential equalization: For optimum shielding, connect shielding on both sides. If potential equalization currents are expected, ground shielding on one side only, preferably at the transmitter.

Overvoltage Protection (Optional)

• Devices with "NA" in feature 610 of the order code are equipped with overvoltage protection.
• Installation length is approximately 70 mm (2.76 in).
• When tightening/loosening the union nut, use a wrench to hold the screw steady.

Post-Connection Check

• Verify supply voltage matches nameplate specification.
• Confirm proper device connection.
• Ensure all screws are firmly tightened.
• Check that housing covers are screwed down tight.

Operation

Operating Elements

• DIP switch: Controls damping (on/off). Factory setting for damping is typically t = 2 s.
• Operating keys:
  • "Zero" (brief press): Displays lower range value.
  • "Zero" (≥ 3 s): Accepts present pressure as the lower range value (LRV).
  • "Span" (brief press): Displays upper range value.
  • "Span" (≥ 3 s): Accepts present pressure as the upper range value (URV).
  • "Zero" and "Span" (brief press): Displays position adjustment.
  • "Zero" and "Span" (≥ 3 s): Performs position adjustment (shifts sensor characteristic curve so present pressure becomes zero value).
  • "Zero" and "Span" (≥ 12 s): Resets all parameters to order configuration.

Device Display (Optional)

• Four-line liquid crystal display (LCD).
• Shows measured values, fault messages, and notice messages.
• Display can be removed and rotated in 90° stages for easier reading.
• Functions include:
  • Eight-digit measured value display with sign and decimal point.
  • Bar graph for 4 to 20 mA current display.
  • Diagnostic functions (fault and warning messages).
• Display Symbols:
  • F: Failure
  • M: Maintenance required
  • C: Function check
  • S: Out of specification

Commissioning

• The device is factory configured for "Pressure" mode with measuring range and unit matching the nameplate.
• Warning: If process pressure exceeds maximum permitted limits, alternating "S" and "Warning" messages appear on the display. Use the device within sensor range limits.
• Notice: If process pressure is below minimum permitted limits, alternating "S" and "Warning" messages appear. Use the device within sensor range limits.
• Procedure:
  1. Perform post-installation and post-connection checks.
  2. Position Adjustment: Press "Zero" and "Span" simultaneously for at least 3 seconds with pressure present.
  3. Set Lower Range Value (LRV): Apply desired LRV pressure and press "Zero" for at least 3 seconds.
  4. Set Upper Range Value (URV): Apply desired URV pressure and press "Span" for at least 3 seconds.
  5. Check Settings: Briefly press "Zero" for LRV, "Span" for URV, and "Zero" + "Span" for position offset.

Maintenance

• Keep pressure compensation and GORE-TEX® filter free from dirt.
• Cleaning: Flushing rings are available as an accessory for cleaning the process membrane without removing the transmitter. For PMP55 with inline seals, CIP (hot water) is recommended before SIP (steam).
• Exterior Cleaning: Use cleaning agents that do not corrode surfaces or seals. Avoid mechanical damage to the membrane. Observe the device's degree of protection.

Troubleshooting

• Messages: Devices use status information codes according to NE107: F (failure), M (maintenance required), C (function check), S (out of specification).
• Measures: Check cable/pressure value, restart device, or perform a reset. If the error persists, contact Endress+Hauser.
• Output Response to Errors: In case of an error, the current output adopts a value of 3.6 mA.
• Repair: Devices are designed for modular repair. Consult Endress+Hauser Service for certified devices or further assistance.
• Spare Parts: Orderable via W@M Device Viewer (www.endress.com/deviceviewer).

Technical Data

See Technical Information TI00436P.

---

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror