Noise Dampening Fitting for T5 and T9 Ultrasonic Gas Flowmeter Transducers

1. Noise Dampening Fitting for T5 and T9 Ultrasonic Gas Flowmeter Transducers

15 December 2003

2. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
What is it?
> Also called “NDF”
> Dampens short-circuit
noise from transducer
head from being
transmitted along the
transducer shaft
g GE Panametrics

3. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
What’s the benefit?
> Improves SNR by a
factor of 3-4 times
– DVT done with
different path lengths,
different transducers,
with/without NDF,
different temps.,
wet/dry conditions
– Sample view of one
set of test results
g GE Panametrics

4. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
Where is it used?
> For T5 & T9
transducers only
– Not for T8
– Not on 90° heads
unless specified
g GE Panametrics

5. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
Where is it used?
> Will be implemented on
all new T5 and T9
shipments with FH, BH
Barrel, and SH Simple
holders only
– Not for use with IMA
holders
g GE Panametrics

6. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
Can it be retrofit?
> Can be retrofit onto
existing transducers
– Requires cutting a
ferrule off the
transducer shaft in
order to slide the NDF
onto the transducer
shaft
– Should only be done by
qualified GE Pana
Service Person
g GE Panametrics

7. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
Nozzle considerations
> Must have a nozzle
with ID equal to or
greater than 38mm
(equivalent to a 1.5 inch
sch 80 nozzle) so that
NDF can fit through the
nozzle
g GE Panametrics

8. Noise Dampening Fitting

Dec. 2003
Noise Dampening Fitting
What is the value?
> GE: The noise reduction system will strengthen
our position in the market of gas flowmetering,
especially in low gas pressure and saturated
steam applications.
> Customer: The noise reduction system will be
invisible to the customer and will maintain the
maintenance-free nature of our gas
transducers.
g GE Panametrics