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IWDigT Switch or Pulse Input to Wireless Transmitter

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IWDigT Switch or Pulse Input to Wireless Transmitter Converter

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.

Contents

  • Product Features
  • Product Description
  • Wireless Receivers
  • Related Wireless Transmitter Types
  • Product Specifications
    • Contact Switch Input
    • Power Source
    • Wireless Transmission
    • Environmental Limits
    • Materials
  • Part Numbers
    • Volts Input Transmitter
    • Receiver Options
    • Accessories
  • Dimensional Drawing
  • Product Help
    • Voltage free contact input function
    • Mains voltage pass-through
    • Analogue output from IWR wireless receiver
    • Pulse counting function
  • Related Documents
    • Switch/Pulse Input Wireless Transmitter
    • 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.

  • IWR-PORT Wireless to Ethernet, RS232 or RS485 Gateway Receiver IWR-PORT Wireless Sensors to Ethernet, RS232 or RS485 Gateway Receiver
  • IoT Gateway Wireless Sensors to 2G 3G 4G Modem Receiver
  • IWR-USB Wireless Sensors to USB Gateway Receiver
  • IWR-1 Single Channel Wireless Sensor to 4-20mA or 1-5Vdc Output Signal Receiver
  • IWR-5 Five 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
  • IWTT Wireless Battery Powered Temperature Sensor
  • IWTaT Wireless Ambient Temperature Sensor
  • IWTRhT Wireless Ambient Temperature and Relative Humidity Sensor
  • IWTxT Loop Powered 4-20mA Input to Wireless Transmitter Converter IWTxT Loop Powered 4-20mA Input to Wireless Transmitter
  • IWmAT 4-20mA Signal Input to Wireless Transmitter
  • IWVT 0-10Vdc Signal Input to Wireless Transmitter
  • IWCTT Current Transformer mV ac Signal Input to Wireless Transmitter Converter 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

IWDigT Dimensional Drawing

Product Help

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 is that 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 volage 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

  • IWDigT data sheet

Wireless Receivers

  • IWR-1 data sheet
  • IWR-5 data sheet
  • IWR-USB data sheet
  • IoT Gateway data sheet
  • IWR-PORT data sheet

Request Product Price

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