Emerson Process Management 2400S Obtaining the test point values, Evaluating the test points

Troubleshooting

11.19.1Obtaining the test point values

To obtain the test point values:

•With the display, configure the required test points as display variables. See Section 8.9.5.

•With ProLink II

a.Click ProLink > Diagnostic Information.

b.Observe or record the values displayed for Tube Frequency, Left Pickoff, Right Pickoff, and Drive Gain.

•With a DeviceNet tool, execute a Get for the attributes listed in Table 11-4.

Table 11-4Test points with DeviceNet tool

Test point	Class	Instance	Attribute
Drive gain	Diagnostics Object (0x66)	1	20
Tube period			21
Left pickoff			23
Right pickoff			24

11.19.2Evaluating the test points

Use the following guidelines to evaluate the test points:

•If the drive gain is erratic, negative, or saturated, refer to Section 11.19.3.

•If the value for the left or right pickoff does not equal the appropriate value from Table 11-5,based on the sensor flow tube frequency, refer to Section 11.19.4.

•If the values for the left and right pickoffs equal the appropriate values from Table 11-5,based on the sensor flow tube frequency, record your troubleshooting data and contact Micro Motion customer service. See Section 11.3.

Table 11-5Sensor pickoff values

Sensor(1)	Pickoff value
ELITE® CMF sensors	3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
F025, F050, F100 sensors	3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
F200 sensors	2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
H025, H050, H100 sensors	3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
H200 sensors	2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
R025, R050, or R100 sensors	3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
R200 sensors	2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
T-Series sensors	0.5 mV peak-to-peak per Hz based on sensor flow tube frequency
CMF400 I.S. sensors	2.7 mV peak-to-peak per Hz based on sensor flow tube frequency

(1) If your sensor is not listed, contact Micro Motion. See Section 11.3.

Compensation

Measurement Performance

Troubleshooting

Defaults

Configuration and Use Manual 123