Emerson Process Management 3422 User Manual

3-9000-743 Rev S

June 2013

7

Section 7: Maintenance and troubleshooting

This section includes discussion of transducer replacement, meter repair and maintenance, and 
troubleshooting communications and meter diagnostics.

Daniel Ultrasonic Flow Meters are supplied with T-Slot transducer assemblies which are 
extractable while the line is pressurized.

T-Slot transducer assemblies are available on 4-inch and larger meters for the Mark III meters. 
The T-Slot assemblies are available on all meter sizes for the Daniel JuniorSonic™ Meters 
(Models 3410 and 3420). 

 for the types of transducers available.

1.

Slowly vent all line pressure on the Daniel Mark III Ultrasonic Gas Flow Meter to 

atmosphere.

2.

Disconnect transducer cabling from the transducer holders.

3.

If installed, remove the mount cover by loosening the two mount cover screws. These 

screws are captive.

4.

Loosen the T-Slot transducer assembly with a 1 1/4 wrench or socket. Carefully remove 

the T-Slot transducer assembly.

5.

Place a label on the transducer assembly to marks its location (i.e., A1, A2, B1, B2, C1, 

C2, D1, or D2). Port locations are marked on the transducer cable as well as on cast 
meter housings.

6.

Ensure the transducer mount threads are clean and free of debris.

7.

Apply a small amount of Nickel antiseize compound (P/N 3-9960-134) to the threads of 

the hydro-test plug (from kit P/N 1-360-01-220) and install it into the mount.

8.

Repeat Steps 3 through 7 for the other transducer(s) being careful to note the location 

of each transducer in the meter assembly.

9.

Run the field hydrostatic test.

10.

Reverse the steps above to re-install the transducers into their appropriate ports. Before 

reinstalling the transducer assemblies, ensure the transducer ports, mounts, and 
transducer holders are clean and free of debris. Apply a small amount of Nickel antiseize 
compound to the outer threads of the transducer holders before installing into the 
mounts.