AdEM™-PTZ
ROMET LTD. 2
How to Specify Model
How it works
The AdEM®-PTZ is a solid-state electronic volume conversion module that is directly coupled to the magnetic housing
of the Romet meter body. The AdEM®-PTZ employs a magnetic sensing device to sense the rotation of the meter’s
outer magnet which produces a high-resolution input that represents the non-converted (UNC - uncorrected)
metered gas volume. The volumetric input pulses are converted to base measurement conditions (COR - corrected)
by compensating for temperature, pressure (live or fixed) and super-compressibility NX-19 or AGA8 or SGERG88 (live
or fixed).
COR = UNC x P
F
x T
F
x (Fpv)
2
or COR = UNC x P
F
x T
F
x F
Z
Where: COR = Corrected volume (ft
3
or m
3
)
UNC = Uncorrected volume (ft
3
or m
3
)
P
F
= Pressure correcting factor
T
F
= Temperature correcting factor
(Fpv)
2
= Super-compressibility correcting factor (Live Z factor for NX-19
method)
F
Z
= AGA8 or SGERG88 compressibility factor (Live)
The pressure and temperature correction factors are calculated by the formulas as mentioned in section 8. The
temperature is measured by an RTD or IC (optional) temperature sensor located in the temperature well or inlet
differential port (optional) of the meter. Pressure transducer is mounted inside enclosure of AdEM®-PTZ (¼ inch
NPT connector is available for pressure piping arrangement). The optional external temperature sensor location is
recommended for mating the AdEM®-PTZ module to Romet meter bodies that do not have an internal temperature
well.
Both parameter description and values that are integrated by the algorithms of the AdEM®-PTZ firmware (UNC
volume, COR volume, flow rate, date, time, etc.) are displayed on an 8 digit 14-segment semi alphanumeric liquid
crystal display (LCD).
A non-volatile EEPROM memory stores key parameter values, AdEM®-PTZ setup configuration, temperature sensor
calibration data and Audit Trail data in the event of power loss.
AdEM®-PTZ key parameters:
✓ Current values of uncorrected and corrected volumes and measured parameters
✓ Under/Over limit violation monitoring of Pressure, Temperature and Flow.
✓ Present and Previous Day Volumes.
✓ Averages, Maximum and Minimum values for pressure, temperature and flow.
✓ Peak Flow stamped by date and time.
✓ Battery status.
✓ Last Hour Indexes stamped by date and time.
✓ Malfunctions.
✓ Uncorrected Volume Since Malfunction.
AdEM
™
VER 1 or 2 or 3 characters (letters and number)
specifies version of module.
Number specify Comm Port installed:
PTZ – Pressure, Temperature and Super-X No number – RS232; 1 – RS232 Isolated;
2 – RS485
Note: Type of connections (e.g.: Cannon, PG9 connectors)
can be customized according to user specification.
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