Drum-type Gasmeters TG-Series (Wet-Type)
Operation Instructions – Maintenance (Chapter 5)
5.1 General
By use of a magnetic coupling between measuring drum and counter mechanism no leak-age from the gas meter housing can occur. Thus, all RITTER drum-type gas meters are maintenance-free.
5.2 Cleaning of casing and measuring drum from sediments
When the measured gas carries particles, these particles will be scrubbed by the packing liquid and the rotation of the measuring drum during the measuring process. Thus, sediments may build-up at the bottom of the casing and inside of the measuring drum over the time. In order to clean the casing and measuring drum from these sediments, the casing should be flushed from time to time.
For doing this, the casing must be drained through the drainage faucet. Refill with clean water and add any detergent (if appropriate: dishwashing detergent) which does not attack the meter material. Repeat draining and refilling until no sediments are visible while draining the meter.
If the gas meter size is small enough, it is favourably to hold the meter "face down" and to shake the meter slightly when coming to the end of the draining process. Thus, potential sediments at the inside of the measuring drum are scrubbed in the best possible way.
5.3 Disassembly of the rear plate
The rear plate of the housing can be removed in order to allow the gas meter housing to be cleaned from the inside if required. When removing the plate, it is essential to ensure that the support secured onto the inner face of the housing rear plate and which engages in the measuring drum is not broken off and that the measuring drum is not damaged by this support.
However, after opening the gas meter housing and removing the measuring drum, it must be borne in mind that following refitting the measuring drum will very probably no longer be in exactly the same position as it was during calibration at the factory. This could result in a different calibration result.
We therefore recommend that you send your gas meter to the works for inspection, cleaning and recalibration if the measuring drum becomes dirty and in the event of measuring inaccuracies or other operational faults.
5.4 Trouble shooting
In the unlikely event of problems with the function of the meter, please contact your national distributor or the Ritter Company. In order to be able to be of assistance, we kindly ask you to check the following items and to collect the requested data prior to your contact:
- Serial number of the meter.
- Is the packing liquid level set correctly?
- What is the gas flow rate at which the problem occurs?
- What is the gas inlet pressure at this flow rate?
- What is the spread of the gas inlet pressure (min./max. pressure) at this flow rate?
- Is the gas meter outlet nozzle free to atmosphere?
- What is the approx. gas temperature?
Especially the data according to (d) and (e) are valuable information to find the reason for the problem(s).
Subject to alterations