MODEL 225TROUBLESHOOTING

TROUBLESHOOTING

 

PROBLEM

 

PROBABLE CAUSE

SOLUTION

 

 

 

 

 

 

Off-scale reading

 

Wiring is wrong.

Verify and correct wiring.

 

 

 

 

 

 

 

 

 

 

RTD is open or shorted.

Check the RTD for open or short circuits.

 

 

 

 

 

 

 

See Figure 12.

 

 

 

 

 

 

 

 

 

 

Sensor is not in process stream.

Confirm that the sensor is fully submerged in

 

 

 

 

 

 

 

the process stream. See installation section.

 

 

 

 

 

 

 

 

 

 

Sensor is damaged.

Perform isolation checks. See Figure 12.

 

 

 

 

 

 

Noisy reading

 

Sensor is improperly installed in the

Confirm that the sensor is fully submerged

 

 

 

 

process stream.

in the process stream. See installation section.

 

 

 

 

 

 

 

 

 

 

Sensor cable is run near high voltage

Move cable away from high voltage conductors.

 

 

 

 

conductors.

 

 

 

 

 

 

 

 

 

 

 

Sensor cable is moving.

Keep sensor cable stationary.

 

 

 

 

 

Reading seems wrong (lower

Bubbles are trapped in the sensor,

Install the sensor in a vertical pipe run with

 

or higher than expected)

particularly in the toroid opening.

the flow against the toroid opening. Increase

 

 

 

 

 

 

 

flow if possible.

 

 

 

 

 

 

 

 

 

 

Sensor is not completely submerged in

Confirm that the sensor is fully submerged

 

 

 

 

the process stream.

in the process stream. See installation section.

 

 

 

 

 

 

 

 

 

 

Cell constant is wrong. Wall effects

Calibrate the sensor in place in the process

 

 

 

 

are present.

piping. See calibration section.

 

 

 

 

 

 

 

 

 

 

Wrong temperature correction algorithm

Check that the temperature correction is

 

 

 

 

is being used.

appropriate for the sample. See analyzer

 

 

 

 

 

 

 

manual for more information.

 

 

 

 

 

 

 

 

 

 

Temperature reading is inaccurate.

Disconnect the RTD leads (Figure 12) and

 

 

 

 

 

 

 

measure the resistance between the in and

 

 

 

 

 

 

 

common leads. Resistance should be close

 

 

 

 

 

 

 

to the value in Table 1.

 

 

 

 

 

 

 

 

 

 

Slow temperature response to sudden

Use an RTD in a metal thermowell for

 

 

 

 

changes in temperature.

temperature compensation.

 

 

 

 

 

 

Sluggish response

 

Sensor is installed in a dead area in the

Move sensor to a location more representative

 

 

 

 

piping.

of the process liquid.

 

 

 

 

 

 

 

 

 

 

Slow temperature response to sudden

Use an RTD in a metal thermowell for

 

 

 

 

changes in temperature.

temperature compensation.

 

 

 

 

 

 

TABLE 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature

 

Resistance

 

 

 

 

 

 

 

 

 

 

 

10°C

 

103.9 Ω

 

 

 

 

 

 

 

 

 

 

 

20°C

 

107.8 Ω

 

 

 

 

 

 

 

 

 

 

 

25°C

 

109.7 Ω

 

 

 

 

 

 

 

 

 

 

 

30°C

 

111.7 Ω

 

 

 

 

 

 

 

 

 

 

 

40°C

 

115.5 Ω

 

 

 

 

 

 

 

 

 

 

 

50°C

 

119.4 Ω

 

 

7

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Emerson Process Management 225 instruction sheet Troubleshooting, Problem Probable Cause Solution, Temperature Resistance
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225 specifications

Emerson Process Management is a renowned leader in automation solutions, providing cutting-edge technologies that enhance process efficiency and operational reliability. One of their flagship offerings is the Emerson Process Management 225, a sophisticated system designed to optimize industrial processes across various sectors.

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In summary, the Emerson Process Management 225 stands out for its modular design, advanced analytics, remote capabilities, interoperability, user-friendly interface, and commitment to safety. Together, these features and technologies make it a powerful solution for organizations seeking to enhance their process management and operational efficiency.
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