Power and measure the current loop signal output from any 4 to 20 milliamp transmitter, and wirelessly transmit it to a wireless receiver hub for distributing to other instrumentation via analogue output, digital coms, or a mobile network.
The IWTxT belongs to the IW series of wireless measurement products, and can be used alongside a suite of complementary wireless transmitters for different measurement types, and is fully compatible with all IW series wireless receivers.
Product Features
- 4-20mA input measurement
- Tx loop powered current loop
- 0.1% measurement accuracy
- -20 to +80°C operating temperature range
- Up to 500 m line-of-site range (depending on receiver)
- User-selectable transmission update rates
- Analog output, RS-232/485, Ethernet, USB, cellular network receivers
Product Description
The IWTxT is designed to convert any standard 4-20 mA transmitter type sensor into a wireless sensor.
It works by switching on a supply to the 4-20 mA transmitter, waiting for a suitable settling time and then sending the data to a wireless receiver unit.
The IWTxT is specially designed to maximise battery life and in a typical application the battery life will exceed 12 months. The data update rate is user selectable to suit the requirement of each measured variable and so maximize battery life.
Typical update rates include 1 second, 10 seconds, 60 seconds or 1 hour. The system also features a signal strength reading and time since last transmission which can be remotely monitored.
The IWTxT wireless 4-20mA input transmitter is battery powered and can be installed up to 500m away from the wireless receiver unit.
Monitor and log 4-20mA output devices from multiple locations using the user interface dashboard provided for each type of wireless receiver hub.
Each 4-20mA to wireless converter is compatible with a choice of wireless receivers to transmit the current signal via an analogue output, Ethernet TCP connection, RS232/RS485 Modbus RTU serial interface, or a 2G/3G/4G mobile cellular network.
Wireless Receivers
Browse through the product family of compatible wireless receivers for combining with the IWTxT loop powered 4-20mA input wireless transmitter to build a complete wireless measurement system.
IWR-1 Single Channel Wireless Sensor to 4-20mA or 1-5Vdc Output Signal Receiver
IoT Gateway Wireless Sensors to 2G 3G 4G Modem Receiver
IWR-PORT Wireless Sensors to Ethernet, RS232 or RS485 Gateway Receiver
IWR-5 Five Channel Wireless Sensor to 4-20mA or 1-5Vdc Output Signal Receiver
IWR-USB Wireless Sensors to USB Gateway Receiver
Related Wireless Transmitter Types
Monitor other measurement parameters from the following range of system compatible wireless transmitters, which are all compatible with the same range of wireless receivers.
IWPT Wireless Battery Powered Pressure Sensor and Receiver
IWmAT 4-20mA Signal Input to Wireless Transmitter
IWTRhT Wireless Ambient Temperature and Relative Humidity Sensor
IWTT Wireless Battery Powered Temperature Sensor
IWTaT Wireless Ambient Temperature Sensor- IWVT 0-10Vdc Signal Input to Wireless Transmitter
IWDigT Switch or Pulse Input to Wireless Transmitter
IWCTT Current Transformer mV ac Signal Input to Wireless Transmitter
Product Specifications
| Parameter | Min | Typ | Max | Comments |
|---|---|---|---|---|
| Supply Voltage | 3.6V | Battery powered (18V tx Supply) | ||
| Supply Current (mA) | 40 | When transmitting data | ||
| Input Impedance | 15 ohms | |||
| Ambient Temperature Range | -20°C | 80°C | ||
| Isolation Voltage | 1kV |
Product Specifications
Analog Signal Input
- 4 to 20 millamps current, linear, powered only when transmitting to receiver
Power Source
- Battery Type: User replaceable Lithium C cell
- Battery Life: Five years at 10 second update rate
- Battery Shelf Life: 10 years
Wireless Transmission
- Transmission Frequency: 2.4 Ghz IEEE 802.15.4, compliant with EN 300 328, V1.8.1
- Transmit Power: 18 dBm
- System Channel: User selectable via DIL switch
- Antenna: Integral 0dBi
Environmental Limits
- Operating/Ambient Temperature: -20ºC to +80ºC
- Storage Temperature: -20ºC to +80ºC
Materials
- Wireless Enclosure Material: Plastic
- Weight: 150g typical including battery
- Installation Position: Any within range
Enclosure
- Mounting: Wall mounting
- Orientation: Any
- Connections: Screw clamp with pressure plate
- Conductor Size: 0.5-4.0mm
- Insulation Stripping: 12 mm
- Enclosure Size: 160 x 90 x 50 mm deep
- Weight: ~100g
Part Numbers
mA Input Transmitter
- IWTxT – Wireless 4-20mA Transmitter
Receiver Options
- IoT Gateway – Built-in cellular modem allows all data to be sent to remote servers
- IWR-PORT – RS-232 or RS-485 or Ethernet MODBUS Communications. Up to 128 off analog 4-20 mA or Relay outputs can be obtained by fitting extra ISOSLICE I/O modules
- IWR-USB – Displays & Logs data on any PC running IWR-USB software
- IWR-5 – 5 channel 4-20 mA or 1-5 V dc and 1 Relay output ***
- IWR-1 – 1 channel 4-20 mA and 1-5 V dc and 1 Relay output ***
***Transmission Update Rate 1, 5, 10 and 30 seconds
Consult installation manual for set-up:
Single channel system is DIL switch configurable
Five channel system requires set-up using “IWR Set” user software
Accessories
- IWR-Set – 5 channel configuration software
- IBAT-1 – spare battery
Dimensional Drawing
Related Documents
4-20mA Input Wireless Transmitter
Wireless Receivers
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