Micro Motion 2700 Transmitter = Flashing Red (Zero reading at flow conditions/ Erratic flow rate at no-flow conditions)

Figure 1.1 - Flashing Red (Erratic flow rate)

#Observed the Status LED

Flashing RED = One or more high-severity alerts are active and have not been acknowledged.

Figure 1.2 - Flashing Red (Zero reading)

1). Check the wiring between the Sensor and the Transmitter.

→Faulty cable, improper wire termination, or loose wires or connectors.

→Shorts to the housing created by trapped or damaged wires.

2). Inspect the Sensor and Core Processor

→For sensors with a junction box, check for moisture inside the junction box (Ensure that the junction box is dry and no corrosion is present).

Figure 1.3 - Core Processor (TH050 Sensor)

#Possible Cause

→Moisture inside the sensor junction box (short circuit).

→Liquid or moisture inside the sensor case (intermittent signal).

→Sensor/Core Processor damage.

Figure 1.4 - Water/Moisture Ingress

#Recommended Action

→Dry completely with clean compressed air, and clean corrosion on terminals with contact cleaner/electrical cleaner.

→Check gasket and o-ring on the housing cover. Replace if hardener or torn.

→Check cable glands at the bottom (most common entry point for water).

→Reseal with silicone grease on the gasket before closing.

→Replace the Core Processor.

3). Replace the Sensor Assembly (TH050/ Model 800)

→Disconnect the wires to the Core Processor.

→Remove the piping and the sensor assembly.

→Replace the corroded bolts.

→Mount the Sensor (Flow direction arrow on the sensor case matches the actual forward flow of the process).

Figure 1.5 - Model 800 (Enhanced Core Processor)

→Connect the wires to the Core Processor.

A = Terminal 1 (Power Supply +)

B = Terminal 2 (Power Supply -)

C = Terminal 3 (RS-485/A)

D = Terminal 4 (RS-485/B)

4). Connect with ProLink III

→Check the Calibration Factors (Refer to the Name Plate) = Device Tools - Calibration Data.

Figure 1.6 - Flow Calibration Factor

→Flow Calibration Factor (FCF, FT) and Density Calibration Factors (D1, D2, DT, K1, K2, FD, FTG, FFQ, DTG, DFQ1, DFQ2).

5). After Replace the Sensor Assembly

Figure 1.7 - Flashing Green

Figure 1.8 - TH050 Sensor (New/Old Model)

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