gas probe for meter dresser NPL12

I have a Dresser gas meter of type NPL12.

The data sheet of this meter can be found here

There is on this meter a connection for remote reading with LF pulse emitter.
Is there any chance of being able to use the gas probe with it? Any alternative solution?

Thanks for your help.


on3ptz's picture

Can you make better pictures of the black cap on your meter?

papagenic's picture


here are 2 pictures of my meter:
first one here with the black cap on. no connector visible

Second one here with the black cap removed. just en empty space for ? magnetic sensor?

Thanks for your help

gebhardm's picture

If there is a magnet built in (neither spec nor type sign give an Indikation on that) test it with a compass...

on3ptz's picture

is there in the gap transparent plastic to see the counter/reflective surface ? if not ---> magnet readout

if there is some reflective part it can be optical or magnetical.

or test it with a compas

- We should make a wiki for types of gasmeters ....

on3ptz's picture

I also see a gear on the back of the gap,

if the meter turns do you see something change ? reflective of metal part in it like a magnet ?

icarus75's picture

Looks like the cavity in the enclosure is made mounting a Reed switch. Please test on a running meter with a compass near the cavity as indicated by gebhardm. If the compass deflects at least once for a full rotation of the last digit then a Reed contact like the FLS02-F1 can be used.

@on3ptz You're right about the need for a compatibility matrix.

papagenic's picture


I did the test with a compass, and indeed the compass needle is deviated each time the wheel makes one turn. It is even possible to see (or to guess) the magnet on the wheel.
Here is a picture of it.
I guess then a reed switch will work. I will try and report.