Measure the open and closing of any voltage free contact switch or pulses from a counter input, and wirelessly transmit it to a wireless receiver hub for distributing to other instrumentation via analogue output, digital coms, or a mobile network.
The IWDigT 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
- Contact switch open & close detection
- Pulse counter input
- -20 to +80°C operating temperature range
- Up to 500 m line-of-site range (depending on receiver)
- Five-year battery life at 10 second transmission update rate
- User-selectable transmission update rates
- Analog output, RS-232/485, Ethernet, USB, cellular network receivers
Product Description
The IWDigT is designed to detect any voltage free contact switch or a pulse rate output and transmit the open/closed state or pulse output via wireless communications to a receiver unit.
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 IWDigT wireless contact switch or pulse count input transmitter is battery powered and can be installed up to 500m away from the wireless receiver unit.
Monitor and log the opening and closing of switch contacts at multiple locations using the user interface dashboard provided for each type of wireless receiver hub.
Each contact switch detector or pulse counter input to wireless converter is compatible with a choice of wireless receivers to transmit the switch state 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 IWDigT contact switch & pulse counter input wireless transmitter to build a complete wireless measurement system.
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
IWR-1 Single Channel Wireless Sensor to 4-20mA or 1-5Vdc Output Signal 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
IWTxT Loop Powered 4-20mA Input to Wireless Transmitter
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
IWCTT Current Transformer mV ac Signal Input to Wireless Transmitter
Product Specifications
Contact Switch Input
- Any voltage free contact switch
- Pulse counter
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
Part Numbers
Volts Input Transmitter
- IWDigT-S-00 – Contact switch wireless transmitter
- IWDigT-P-00 – Pulse counter input wireless 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
Product Help
60m and inside shipping container wireless range
We are installing LPG gas consumption monitoring and metering, and need to transmit the a pulse count signal from a gas tank counter to an energy management system inside a shipping container. It will be 60m from the transmitter to the receiver which is inside an electrical enclosure inside an insulated shipping container.
We would suggest a IWDigT-P wireless pulse input counter and a IWR-Port-RS485 wireless receiver for this application. If the electrical enclosure is metal than an 6dBi gain external antenna on the outside of that enclosure would be needed which can be connected to the receiver via a 5m antenna cable.
- SKU ID: s1-iw-series-143-61552
- Wireless Transmitters: Analogue Signal Input
- Analogue Signal Input: Pulse counter input
- Wireless Receivers: RS485 serial port with Modbus RTU
- Optional Extras: 6dBi antenna for increased wireless range, 5m antenna cable assembly
Voltage free contact input function
For the voltage free contact input, what is the spec for this, any voltage, current, impedance limits? Does it provide the voltage for the circuit or does it have to be externally applied? Can it be incorporated into an existing control loop, or does it need to be a separate circuit without any other components other than the switch contacts?
In this context, the voltage free contact input means that the two terminals need to be effectively shorted out to change the input. Typical examples would be a relay contact or mechanical switch. The IWDigT has a small voltage on one terminal and then measures this on the other terminal so no external voltage should be applied. It usually needs to be a separate circuit to avoid any external voltage being applied to the IWDigT.
Mains voltage pass-through
Can ac mains voltage be passed through the switch inputs?
No, voltage should not be passed through the switching circuit, otherwise this will damage the internal input electronics. the IWDigT generates a small voltage from one input connection, and checks if the same voltage is present on the other input connection, therefore detecting if a contact switch is closed or open.
Analogue output from IWR wireless receiver
What output is the open/close converted to on the IWR-1/5 outputs? is it the Alarm relay output?
Yes it can be the relay output, or the 4-20mA / 1-5Vdc can also go from zero to full scale, when the switch is open of closed.
Pulse counting function
How does the pulse version IWDigT-P work, is it measuring a pulse rate signal, counting pulses, or just retransmitting pulses to be counted by other instrumentation?
It’s the same hardware with different software to count pulses rather than just detect an ON/OFF state. Typical inputs for this would be NPN or PNP or solid state relay outputs from flow meters. The pulse rate is calculated inside the IWDigT-P and this is the reading which is wirelessly transmitted.
For example if you want a signal for a range of pulse rate from 0 to 500 pulses per minute, the IWR-1 will be setup to output 4-20mA over this range. A reading of 12mA would correspond to a pulse count rate of 250 pulses per minute.
Related Documents
Switch/Pulse Input Wireless Transmitter
Wireless Receivers
Request Product Price
Please select the options you require for the IWDigT Switch or Pulse Input to Wireless Transmitter in your application and request a quote.