Radio current loop 4-20 mA - Rpp 1.00

Radio 4-20 mA current loop Rpp 1.00 is used for wireless transmission of current from the sensor and forcing it on the receiving side. The set consists of a transmitter and a receiver.

Radio current loop 4-20 mA – Rpp 1.00

Destination

The radio current loop is intended for the radio single-channel 4-20 mA loop signal transmission. The set consists of two modules: a transmitter and a receiver. The device is used in situations where the laying of the cable is associated with difficulties in the form of drilling walls, installing cable trays or digging a ditch or making a passage under a roadway or pavement. The radio transmission takes place in the band intended for Low Power Radio Devices (LPRD), which does not require permits or fees.

Facilities

The device enables quick conversion of a sensor of any size with a current output of 0-20 mA (4-20 mA) per wireless sensor. This makes it easy to bring the measurement signal to the controller. It is very useful in cases when the measuring point is moving on land or water. An additional, beneficial effect of the application of the wireless current loop is the galvanic separation of the measuring sensor and the object controller. This can be important in terms of measurement interference or induced overvoltage, especially at long connections. It is also worth considering using the device in places where the cord is exposed to frequent mechanical damage.

Mode of action

The transmitter processes the input signal from the current loop, averages it and sends to the receiver, which forces the received value on the output. After the power is turned on, the transmitter starts the cyclic transmission automatically. To increase the operating range, you can use the Rpp 1.00 T – wireless loop transmitter described here, if necessary.
Transmitted data packets contain an individual address, which allows the work of many devices in the same area.
The device with greater functionality is the radio current loop Rpp 2.00 described here.
The device is delivered with fixed values of operating frequency, baud rate, output power and packet address. The above parameters can be changed at the recipient’s request in the intervals given in brackets in the technical data.
If it is necessary to display the value of the measuring current, you can use the receiver in the Rpp 2.01-O version with the OLED display. It is described here.

Radio current loop Rpp 1.00

Technical data

The operating parameters are subject to the standards of the European Telecommunications Standards Institute ETSI and are listed in ETSI EN 300-220-2.
♦ Operating frequency: 868.29388 (868.0 ÷ 868.6) MHz
♦ Modulation type: GFSK
♦ Output power: +10 (-10 ÷ +10) dBm
♦ Receiver sensitivity: -110 dBm
♦ Range: 300 m in the open area
♦ Transmission: autonomous, average period 30 s (min. 103 ms), test mode: 2 s
♦ Baud rate: 1.2 (1.2 ÷ 500) kbps
♦ Polite spectrum access: CCA (Clear Channel Assessment)
♦ Antenna: internal, right angle
♦ I / O signal: 0-20 mA current
♦ Transmitter input current resistance: 115 ÷ 135 Ω
♦ Receiver output current load resistance: max. 750 Ω
♦ Transfer accuracy: 0.25 % in the 4-20 mA range
♦ Power supply: 24 V DC ± 5% external
♦ Power consumption: max. – transmitter: 55 mA
– receiver: 65 mA
♦ Terminals: cable entry Pg7, IP68, outer diameter of the wire 3.0 ÷ 4.0 mm, core diameter max. 0.75 mm²
♦ Housing (W × H × D): 82 × 80 × 55, polycarbonate, wall mounted, IP65
♦ Operating environment: – temperature -20 ÷ +55 ° C
– relative humidity <95%, non condensing
♦ CE declaration of conformity issued on the basis of tests carried out by the Institute of Communications – PIB (notified body No. 1471).