Documentation and Technical Specifications PTZ

Documentation and Technical Specifications PTZ
Gas - Measurement
PTZ-BOX V2 Electronic Volume Converter
Documentation and Technical Specifications
• Advanced conversion device for gas volume meters
(approved for custody transfer)
• Relevant type approvals available
• Low cost / high performance
• Second pulse input for sensor check
• Easy installation, operation and maintenance
• Small size and weight
• Software for Windows™ included
• Extended communication options
• Suitable for zone 1 and zone 2
The PTZ-BOX V2 can be easily configured using the software and a PC or notebook.
Available serial interfaces are infrared as well as RS 232 and
RS 485 cable connections. By means of these interfaces the
device can be connected directly to a computer or via line
modem, GSM modem, radio modem or GPRS connection.
Local read out can also be performed by using a handheld
computer (PDA).
In zone 1, RS 485 must be used in combination with an IS
barrier (see “Additional Equipment”).
The PTZ-BOX is designed to meet
• EN 12405,
• German DIN standards and the rigid German
regulations for custody transfer,
• and other relevant international standards
The device can also be accessed by DCS or SCADA systems
via Modbus RTU or dedicated protocols.
The following error modes are registered:
• Pressure or temperature
above maximum or below minimum
• Gas meter’s actual flow rate above Qmax
• Diagnostic status in case of an internal error
• Battery capacity below 10 %
• Setting log full
• Gas meter manipulation (if connected)
• Pulse sensor error (if 2 sensors are connected)
PTZ-BOX V2 is equipped with a 10 character numeric LCD.
This display is operated by pushing two buttons on the
front panel. It gives access to the current values, set values
and errors.
The PTZ-BOX V2 is a battery or line powered compact volume converter for gas volume measurement applications.
Applications are with gas flow meters like diaphragm
meters, turbine meters, rotary piston meters, and vortex
shedding meters.
The EEPROM memory provides storage capacity for
• 21 monthly records
• 8 years of daily records
• 25344 records (standard set of parameters) or 11264
records (extended set of parameters) settable at intervals
of 5 to 60 minutes (that is 34 months of information
with hourly intervals and standard set of parameters)
• Status archives and setting archive
It is equipped with an energy-saving pressure transmitter
and a temperature probe. This equipment is supplied integrally with the converter.
The converter uses volume pulses generated by a gas meter,
measures pressure and temperature, and calculates the
compressibility factor Z of the gas as well as the conversion
factor C. From these input values given, it calculates the
volume at base conditions, the base flow rate and the
actual flow rate. The counted pulses from the gas meter
can be checked by connecting a second pulse sensor.
Power Supply
The standard power supply is a lithium battery. The life time
of that battery is a minimum 6 years, providing a measurement interval of 10 seconds or more and communication
via serial interface once a day. When the battery power is
below 10 %, it will generate an alarm for a battery change.
The volume measured at actual conditions is converted to
volume at base conditions according to EN 12405, complying with most other standards.
The compressibility factors Z and Zb may be fixed for all gas
types or calculated according to several methods for natural
• Z/Zb = 1 (Ideal gas) or Z/Zb = const. ≠ 1
• AGA NX 19 or AGA NX 19 mod
• AGA 8 G1 or G2
• SGERG 88
As an option, the PTZ-BOX V2 can be powered by an intrinsically safe power supply. The battery will provide power, in
case of line power failure.
Initial Verification and Calibration
Each PTZ-BOX V2 is provided with the following
• IOM Installation, Operation and Maintenance Manual
• CD-ROM with
– IOM (manual as pdf-softcopy)
– Software for configuration and read out
• Specification data sheet with the preset
parameters of the device
The optional factory calibration certificate is often sufficient
when a calibration document is required.
NMi initial verification certificate can be supplied as an
Legal calibration certificates for other countries are available
on request.
Optional Equipment
• Infrared head for RS 232 serial interface, to be used for
easy read out and configuration via PC or notebook (USB
connection requires a converter), 2.5 m or 12 m cable
• Cables for connecting RS 232 or RS 485, provided with
male plug (IP 65)
• Intrinsically safe communication modules, barriers and
power supplies
• Analogue output module 4 – 20 mA
• Telemetric modules complete with power supply,
modems, barriers and safety modules, configuration
according to your specifications
• Thermo-wells, thread-o-lets, three-way-valves and other
The PTZ-BOX V2 is delivered with equipment for wall
mounting or for mounting at the pipe upstream or downstream of the meter. A weldolet with thermo-well is also
supplied (common sizes and threads).
Pre-assembly in the factory is an alternative. The temperature probe needs a thermo-well close to the gas meter:
Downstream of a gas turbine meter or upstream of a rotary
gas meter. For custody transfer applications in many countries, you need a second thermo-well and a three-way-valve
in the pressure line. The vemm tec gas meters can be provided with a thermo-well in the meter body, but this is not
permitted by some local metrological services.
Electronic Volume Converter PTZ-BOX V2 with temperature probe Pt 1000
Table: Technical specifications PTZ-BOX V2
Dedicated intelligent Lithium battery
Life time with battery power:
6 years minimum
(under specified conditions of use)
Optional: External power supply (IS)
4.7 to 10.0 V DC
1 or 2 LF contact inputs
(Reed or Wiegand)
100 / 10 / 1 / 0.1 / 0.01 m3/imp
with 4 Hz max. frequency
Contact, if available in gas meter
Piezo resistance sensor, mounted in the
casing, with the following ranges:
0.8 - 5.2 bar(a)
0.9 - 3.0 bar(a)
2.0 - 10 bar(a)
2.0 - 5.2 bar(a)
4.0 - 20 bar(a)
3.0 - 10 bar(a)
7.0 - 35 bar(a)
14 - 70 bar(a)
Other ranges on request
Connection: 6 mm Ermeto M12x1.5
Pt 1000 probe,
fixed to the device
Battery operation:
Line power:
10 digits LCD, showing actual values,
settings and errors
Compressibility calculation according to
EN 12405 and other standards:
AGA NX 19 (standard or mod)
AGA 8 G1 or G2
SGERG 88 or fixed value
Tamper switch
10 / 15 / 20 / 30 s
Every 2 seconds
Base volume:
< ± 0.15 % under reference conditions
< ± 0.50 % in the whole range of
pressure and temperature sensors
vemm tec Messtechnik GmbH
Gartenstrasse 20
14482 Potsdam-Babelsberg
Tel. +49 (0) 3 31 / 70 96 274
Fax +49 (0) 3 31 / 70 96 270
E mail:
21 records of 12 values
3072 records (8 years) of 20 values
25344 records of 9 values or
11264 records of 20 values
(The custom archive can hold
34 months of information with
9 values stored at hourly intervals).
Status archive
Setting archive
5 / 10 / 15 / 20 / 30 / 60 minutes
500 records of error messages
500 records of setting changes
Pulse outputs
Unconverted flow (scalable)
Converted flow (scalable)
Alarms (settable pulse width)
Pulses are provided as pulse train at the
beginning of each measuring period.
Infra red port RS 232 (IS)
RS 232 port (not intrinsically safe) and
RS 485 port (IS) combined in one socket
with connector (IP 65)
Communication speed selectable:
19.2 / 9.6 / 4.8 kbit/s
Serial outputs
Error status at high or low pressure or
temperature, high flow rate, low battery,
manipulation with gas meter, pulse error
and internal errors
II 2G EEx ia IIC T4/T3
FTZÚ 05 ATEX 0164X
Netherlands Measurement Institute (NMi)
TC3572, T6794 and others
A password is required to change the
settings. The sealable configuration switch
must be put to the “set” mode. The
device can be protected by seals
(user or metrological service).
The included software package enables
configuration and read out of the device.
Values can be exported to several standard
software packages (Excel, Access, Paradox,
Foxpro) or to text formats or XML.
Scada systems can access the device via
Modbus RTU or via optionally dedicated
Jan. 2006
Temperature: -25 to +60 ºC (standard)
-40 to +60 ºC (optional)
Storage temperature: -40 to +60 ºC
Changes in course of technical development are reserved.
Gas - Measurement
Dimensions: 100 x 120 x 70 mm
Weight: 1.2 kg
Material: Aluminium alloy
IP 65: According to EN 60529
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