Checking The Test Points; Obtaining The Test Points; Evaluating The Test Points - Emerson Micro Motion 2700 Configuration And Use Manual

Troubleshooting
6.12

Checking the test points

You can diagnose sensor failure or overrange status alarms by checking the flowmeter test points. The
test points include left and right pickoff voltages, drive gain, and tube frequency.
6.12.1

Obtaining the test points

You can obtain the test points with the PROFIBUS EDD, PROFIBUS bus parameters, or ProLink II.
With PROFIBUS EDD
To obtain the test points, select
Amplitude, RPO Amplitude, Drive Gain, and Tube Frequency values.
With PROFIBUS bus parameters
To obtain the test points, examine the indices listed in Table 6-5.
Table 6-5 Bus parameter test points
Slot
11
11
11
11
With ProLink II
To obtain the test points, select
Pickoff, Drive Gain, and Tube Frequency values.
6.12.2

Evaluating the test points

Use the following guidelines to evaluate the test points:
• If the drive gain is at 100%, refer to Section 6.12.3.
• If the drive gain is unstable, refer to Section 6.12.4.
• If the value for the left or right pickoff does not equal the appropriate value from Table 6-6,
based on the sensor flow tube frequency, refer to Section 6.12.5.
• If the values for the left and right pickoffs equal the appropriate values from Table 6-6, based
on the sensor flow tube frequency, contact the Micro Motion Customer Service Department for
assistance.
Table 6-6 Sensor pickoff values
Sensor model
ELITE Model CMF sensors
Model CMF400 I.S.
Model CMF400 with booster amplifier
Model D, DL, and DT sensors
Model F025, F050, and F100 sensors
104
View > Diagnostics > Meter Diagnostics
Index Description
160 Drive gain
161 Tube frequency
163 LPO amplitude
164 RPO amplitude
ProLink > Diagnostic Information
(1)
Pickoff value
3.4 mV peak to peak per Hz based on flow tube frequency
2.7 mV peak to peak per Hz based on flow tube frequency
3.4 mV peak to peak per Hz based on flow tube frequency
3.4 mV peak to peak per Hz based on flow tube frequency
3.4 mV peak to peak per Hz based on flow tube frequency
Model 2700 Transmitter with PROFIBUS-PA
. Record the LPO
. Record the Left Pickoff, Right