The radio receiver is used in conjunction with compatible transmitters for mobile or stationary measurement of physical quantities. The use of advanced radio technology operating at the industrial frequency of 868.4 MHz significantly reduces installation effort. Wired connections can be eliminated, and the wireless sensor technology functions well even in harsh industrial environments. The included λ/4 antenna with an impedance of 50 ohms can be directly screwed on or mounted externally. When using the optionally available antenna wall mount with a 3-meter antenna cable, the free-field range is 300 meters. The measured values received from the transmitter are processed, displayed, and made available as linear current or voltage signals (0(4) to 20 mA, 0 to 10 V) and via a digital RS485 interface. All analog outputs of the receiver are galvanically isolated. Through the digital interface with Modbus protocol, connection to higher-level systems, such as plant visualization software or Modbus master-capable chart recorders, is possible. Operation and configuration can be done via the keyboard in conjunction with a two-line LCD display or more conveniently through a setup program. This allows separate parameters such as filter constants, offsets, alarms, and peak hold (minimum and maximum value storage) to be set for each channel. For this purpose, there is a front-side connector for a PC interface with TTL/RS232 or USB/TTL converter for connecting the receiver to a PC. The receiver is housed in a DIN rail enclosure designed for mounting on a 35 × 7.5 mm DIN rail according to DIN EN 60715. The screw terminals for electrical connections are arranged in different levels. The maximum wire cross-section allowed is 2.5 mm². The power supply is provided by a connection to AC/DC 20 to 30 V, 48 to 63 Hz.