Overview

Measuring Range	0 to 6 bar	0 to 10 bar	available for higher pressure ranges
Resolution	0.2 bar	0.5 bar

Application

The Manometer can be used for measurement of the gas pressure while measuring the gas flow. Among other reasons, this is necessary if the measured and indicated actual volume of gas must be recalculated into the norm volume. The actual volume is the volume at the actual temperature and the actual pressure.

The norm volume of a gas is the volume at norm conditions which are (in Germany):

Norm Temperature	= 273.15 Kelvin ( = 0 °C)
Norm Pressure	= 1,013.25 mbar

The formula for converting the actual volume into norm volume is:

VN	=	Norm Volume in	(ltr)
Vi	=	Indicated Volume in	(ltr)
pN	=	Norm Pressure in	(mbar–absolute)
pa	=	Actual Pressure in	(mbar–absolute)
TN	=	Norm Temperature in	(Kelvin)
Ti	=	Indicated Temperature in	(Kelvin)

Note: The indicated gas pressure at the manometer is the differential pressure between the gas pressure at the gas inlet and the actual atmospheric air pressure. Thus, the actual gas pressure (pa) of the above formula equals the indicated gas pressure at the Manometer plus the actual atmospheric air pressure in (mbar).

Installation

The Manometer is pre-mounted to the gas meter (positioned at the gas inlet nozzle). The gas inlet nozzle is labelled accordingly. Therefore, the manometer is ready for use and no further installation is to be performed by the user.

Please note: The manometer screw connection to the gas meter is sealed by Teflon® tape. When disassembling the manometer from the gas meter, the Teflon® tape cannot be used again and must be replaced by a new Teflon® tape.

_{Image: Bourdon tube pressure gauge
Source: WIKA Alexander Wiegand SE & Co. KG, 63911 Klingenberg/Germany, Data sheet PM 02.02 . 03/2017}