CF500 – Electronic PTZ Gas Volume Corrector
CF500 is a Type 1 electronic gas volume conversion device. It converts the volume measured by a gas meter to base conditions and can be configured for T, PT or PTZ conversion. It is suitable for natural gas metering in commercial transactions. Depending on the model, it offers autonomous battery operation and GSM or RS485 communication.
Key benefits
- T, PT or PTZ conversion: calculates volume at base conditions from the metered volume, temperature, pressure and configured gas properties.
- MID and ATEX: conforms to EN 12405-1 and carries marking for use in explosive atmospheres.
- Autonomous operation: internal 3.6 V / 17 Ah battery; the GSM model also uses an additional battery.
- Remote data access: GSM or RS485 options with Modbus RTU slave communication. The RS485 model uses the external CF500-POW power and barrier module.
- Records for metering and monitoring: hourly, daily and monthly archives, alarm and event logs, and volume and energy totalizers.
Measurement and calculation
CF500 receives pulses from a compatible gas meter through a low-frequency input. A temperature sensor and, in the appropriate model, a pressure sensor provide the measurements used to calculate the correction factor and converted volume. Compressibility methods include modified AGA NX19, SGERG 88, AGA8-92DC and a constant Kz. The device reports uncorrected and corrected volumes, flow rates and energy in kWh or GJ.
Archives and communication
Cyclic archives hold up to 400 hourly, 400 daily and 132 monthly records. Separate alarm and event logs hold up to 300 entries each. Communication is available over GSM or RS485 according to the selected configuration. Data exchange uses Modbus RTU; the GSM implementation includes a Unisyst protocol layer.
Technical specifications
| Models | CF500-XYZ: X = T (temperature) or P (temperature and pressure); Y = G (GSM), R (RS485) or N (no communication module); Z = P (external communication power) or N (autonomous power). |
| Type and metrology | Type 1 gas volume conversion device; EN 12405-1. Energy calculation to EN 12405-2, System 2. MID type examination certificate BG-MI 002-15/01 issued by NB 2341. |
| Compressibility methods | Modified AGA NX19; SGERG 88; AGA8-92DC; constant Kz. |
| Base conditions | Pressure 1.01325 bar; temperature 20 °C. |
| Temperature ranges | Ambient: –25 to +55 °C; measured gas: –20 to +50 °C. |
| Sensors | Pt1000 temperature sensor, Class A (EN 60751); absolute pressure sensor options: 0–10, 3–20 or 0.8–2 bar. |
| Volume input | Low-frequency pulse input, up to 2 Hz. |
| Power supply | Internal 3.6 V DC / 17 Ah battery; additional 4.5 V DC GSM battery; external 5 V DC supply for RS485 via CF500-POW. |
| Communication | GSM or RS485 depending on the model; Modbus RTU (slave). |
| Protection and ATEX | IP67 (EN 60529); II 2 G Ex ib IIB T4 Gb. |
| Conformity | MID 2014/32/EU; ATEX 2014/34/EU; EMC 2014/30/EU. Electromagnetic class E2; mechanical class M2. |