Vympel CONG Prima 2M, Operating Manual, Page: 8 / 59

Cong Prima 2M - manual 7
identifies these connections as “Explosion” and lists the allowable explosion protection
tolerances according to EN 60079-1:2007.
The removable enclosure lids have an inscribed warning:
«
ОТКРЫВАТЬ , ОТКЛЮЧИВ ОТ СЕТИ ~ DO NOT OPEN WHEN ENERGIZED ».
1.4 Analogue and digital connection ports
In order to connect the Cong Prima 2M to a technical-information measuring system or
facility, the analyzer is equipped with a serial interface.
The interface installed can be for the transmission of either analogue or digital signals
depending on the customer’s requirements.
• digital port ! RS 485 Modbus
• analogue port ! 4 – 20 m А .
The selection of either a digital or analogue information transfer port is made when the CP
2M is originally ordered.
If no specification is made with regard to interface preference, the analyzer will be delivered
with an analogue port (4 – 20 mA).
Digital port: RS485:
The digital port provides for the transfer of measurement data to an external system using
the Modbus / RTU protocol (see Appendix O).
The interface is galvanically insulated (up to 500 V DC).
Analogue port 4 – 20 mA:
Depending on the measurement mode selected, either the dpW or dpHC values are sent to
the interface port. The maximum impedance load on each output should not exceed 400
ohms.
The port is passive, meaning that the power supply for the CP 2M is delivered from an
external source. This connection is galvanic insulated up to 500 V DC.
The digital and analogue signals for measured dew point values (dp) correspond to the
following equation:
dp = 3.75 (I – 4) – 30
I = 0.267 ( ТР + 30) + 4
(for water and hydrocarbons in the temperatures range: –30 °C to +30 ° С )
⇒
the value 4 mA corresponds to a dew point temperature (dp) of –30° С
⇒
the value 20 mA corresponds to a dew point temperature (dp) of +30° С