IMP-FC

IMP-FC is an electronic gas volume conversion device and a data logger with integrated GPRS/GSM/SMS modem, collected in one case and installable in hazardous area, particularly in the zone classified as Zone 1. Its purpose is to compute gas volumes at standard conditions, processing volume, temperature, pressure and compressibility at measurement conditions. Gas volumes are measured using a low-frequency (LF) input. Temperature and pressure transducers are installable in the zone classified as Zone 0.

IMP-FC is divided in 2 functional logical sections integrated in a single device

  • The IMP-FC-BOTTOM section, which works on measurement and power supply
  • The IMP-FC-TOP section, which works on data processing, data logging, displaying, and user interface.

IMP-FC complies with the standard UNI EN12405-1:2010 and meets the MID requirements according to the annex MI-002 (gas volume electronic conversion device) according to the Welmec 7.2 Issue 5 guide. It complies with the Italian regulation ARG/gas 155/08 and UNI-TS11291. The gas compressibility computation is carried out according to the ISO 12213-3 (SGERG-88) regulation or imposing a Zb/Z fixed factor programmable by the user. Measured volumes are converted into standard or base volumes, at reference values of 0°C or 15°C and 1,01325 bar, according to the EN12405-1:2010 regulation. These values are programmable by the user.

Physical parameters necessary to implement the gas compressibility law and the conversion factor are:
GAS TEMPERATURE (T)
Measured with a temperature probe that is directly connected to the device
GAS PRESSURE (P)
Measured with a pressure transmitter that is directly connected to the device
GAS VOLUME (Vm)
Measured by the meter pulse. The scale factor of acquired pulse (0,1 – 1 – 10 – 100) is programmable.
PARAMETERS TO DEFINE CHEMICAL/PHYSICAL CHARACTERISTICS OF MEASURED GAS
Values can be programmed both locally and remotely in both cases using CTR protocol.

VOLUME CONVERSION
This device elaborates the measured volume (Vm) and transforms it into base volume (Vb) using parameters acquired on the field (P and T) and the whole of the gas parameters to compute Zb/Z as described above where:

  • Vm = Volume at measurement conditions
  • Vb = Volume converted to base conditions
  • T = Gas temperature at measurement conditions
  • Tb = Absolute temperature at base conditions
  • P = Absolute gas pressure at measurement conditions
  • Pb = Absolute gas pressure at base conditions
  • Z = Gas compressibility factor at measurement conditions
  • Zb = Gas compressibility factor at base conditions
  • C = Conversion factor
All parameters relevant to metrological purposes are protected with seals according to EN12405-1:2010

MEASUREMENT ACQUISITION
Temperature (T)
4-cable temperature probe PT1000
Pressure (P)
Pressure transductor
Volume (Vm)
Low-frequency input (max 3Hz). Received pulses are multiplied by pulse weight.

PARAMETERS DISPLAY AND PROGRAMMING
Parameters are displayed on the IMP-FC backlit display. Metrological data are the following:

  • Volumes at measurement conditions (Vm)
  • Corrected volumes (Vb)
  • Conversion factor (C)
  • Compressibility factor (Z)
  • Pressure at measurement conditions (P)
  • Temperature at measurement conditions (T)
  • All chemical/physical characterisation gas parameters (gas parameters)

STORAGE
Acquired and computed parameters are stored in a temporal recording section. Among others are stored the following:
monthly traces for 12 months
daily traces for 3 months
hourly traces for 3 months
tariff bands

COMMUNICATION
Communication, as stated in the Italian regulation UNI-TS11291, occurs according to the CTR protocol.

DIGITAL OUTPUTS
Acquired and computed volumes and the volume converter alarm status are reported on two digital outputs.

Dimensions 190 x 130 x 100 mm (L x H x P)
Weight 1500g (battery pack included)
Working temperature -25°C ÷ +65°C
Gas temperature -20°C ÷ +60°C
Protection level IP65
Power supply Internal battery pack Li-Ion 3,6Vdc
Battery life > 5 years for MID section
Battery life > 4 years for communication section with 1 GPRS communication per day
It is possible to increase these periods of time using strengthened batteries
Pressure sensor Connected with shielded cable and MID seal applied in factory
Measurement range:
0,8÷2,5 bar absolute 5) 5÷20 bar absolute
0,8÷6 bar absolute 6) 8÷40 bar absolute
2÷6 bar absolute 7) 15÷40 bar absolute
2÷10 bar absolute 8) 25÷80 bar absolute
Temperature probe Pt1000 4 cables class A, connected with shielded cable and MID seal applied in factory. Ø 6mm
Digital inputs 1) LF flow (3 Hz Max)
2) Meter Alarm (N.O.)
3) Tampering (N.C.)
Digital outputs 2, each one configurable to Vb repetition, Vm or Alarms
Keyboard 3 keys
Display 2 lines x 16-letters backlight
Z computation formulas ISO 12213-3 (SGERG-88)
Precision According to EN12405-1:
 Better than 0,5% at reference conditions
 Better than 1% on whole operative range
Local communication Optical serial IEC 62056-21 (ex IEC 1107).
Protocol CTR UNI-TS 11291
Serial RS232 connector Cannon 9 pin female.
Protocol CTR UNI-TS 11291
Remote communication Modem SMS, GSM, GPRS with remotizable integrated antenna.
Protocol CTR UNI-TS 11291
Mechanical class M2 (in accordance with EN12405-1)
Electrical class E2 (in accordance with EN12405-1)
Certification UE
(See Declaration of Conformity UE) 		MID: 2014/32/UE
ATEX: 2014/34/UE
EMC: 2014/30/UE
RED: 2014/53/UE
Miscellaneous Installable in Zone 1
Complies with Italian regulation ARG/Gas 155/08
Firmware updatable both locally and remotely
Optional battery pack to extend to 8 years the device’s autonomy

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Manual