Sensor 0-20mA
€164.10
The galvanically isolated signal converter for 0-20 mA industrial sensors on the 1-Wire-UNI bus
The HW group Sensor 0-20mA 1W-UNI is a galvanically isolated DC current sensor for the 1-Wire-UNI bus. It measures currents in the range of 0 to 20 mA from an external current source and outputs the measured value via the 1-Wire-UNI bus (RJ11). The current input is electrically isolated from the output bus. Typically, the sensor is used to connect an industrial probe with a 0/4–20 mA output (“Source” type, 4-wire with its own power supply), for example to measure the level in a tank.
In this way, almost any industrial sensor can be connected to Poseidon2 or Ares devices. The measured values are then available via LAN or GSM/LTE; if the current falls outside the defined range, an e-mail or SMS is sent. The data can also be passed on to remote monitoring systems based on SNMP or Modbus/TCP. The Sensor 0-20mA 1W-UNI is offered as a single version – there are no variants or options for this model.
Industrial current-loop measurement with calibration and unit conversion
The Sensor 0-20mA 1W-UNI turns an analogue current signal into a full measured value in the HWg monitoring system – if required, converted directly in the sensor into the desired unit.
Input 0–20 mA
For external current-sourcing probes of the type “0-20mA DC (Source)”, input voltage max. 30 V; accuracy 2 % of the full 20 mA range (at 25 °C), resolution 0.1 mA.
Galvanic isolation
The 0-20 mA input is electrically isolated from the 1-Wire-UNI bus (RJ11) – this protects the monitoring device from interference and potential differences.
8-point calibration
The sensor has a calibration curve with 8 points, allowing the measured value to be precisely adapted to the connected industrial probe.
Unit conversion in the sensor
Standard display in [mA]; conversion e.g. into [m], [mm], [hPa] or [ppm] directly in the sensor – the correct value thus also appears in e-mails, SMS messages and the web interface.
2× RJ11 (1-Wire UNI)
Two RJ11 connectors enable daisy-chaining with further sensors; maximum total cable length 60 m from the active port.
Powered via the 1-Wire bus
Power supply with 5 V directly via the RJ11 port (approx. 20 mA).
How the Sensor 0-20mA 1W-UNI is constructed
The compact plastic housing (approx. 65 × 80 × 30 mm, approx. 200 g) with side mounting tabs is designed for table or wall mounting indoors, has protection class IP23 and is suitable for operating temperatures from −40 °C to +85 °C (5–70 % RH); the storage environment ranges from −30 °C to 60 °C (5–95 % RH).
Plastic housing with mounting tabs
The grey housing carries the product labelling on the top and has side tabs for wall mounting; it is designed as a converter for indoor installation.
Two RJ11 connectors for the 1-Wire-UNI bus
One RJ11 port connects the sensor to the active 1-Wire port of the Poseidon2 or Ares device (data and power supply); the second port allows the bus to be continued to further sensors. A 3-metre connection cable is included in the scope of delivery.
2-pole terminal block (I+ / I−)
At the input of the sensor there is a 2-pole screw terminal block to which the external current source (the 0-20 mA probe) is connected with positive and negative leads.
Protective fuse at the input
The current input is protected by a fast-acting 63 mA fuse that protects the sensor and the connected monitoring device in the event of overcurrent.
Galvanically isolated converter circuitry
Inside, the electronics convert the measured current (once per second) into a digital value and transmit it via the 1-Wire-UNI bus. Input and bus are galvanically isolated from each other.
Bus-powered – with option to boost supply for multiple sensors
The sensor is powered directly via the 1-Wire-UNI bus (RJ11) and normally requires no separate power source.
Bus power supply
5 V via the RJ11 port of the connected Poseidon2 or Ares device, current consumption approx. 20 mA.
Maximum 2 sensors per port
One active RJ11 port can supply a maximum of two sensors of this type.
1-Wire hub Power
To boost the supply and branch the 1-Wire-UNI bus, the “1-Wire hub Power” is recommended (hub for 1 to 8 sensors with 8× RJ11, with external power supply).
Adaptation to the connected probe with the 1W-UNI USB Calibrator
With a calibration tool for MS Windows, the sensor can be precisely adjusted to the industrial probe in use.
- Calibration on a curve with 8 different points
- Conversion of the input signal into an output unit such as [mm], [hPa], [m] or [ppm]
- Conversion directly in the sensor – correct values in e-mails, SMS messages and web interface
- Carried out with the 1W-UNI USB Calibrator (USB-RJ11 cable with software) or the 1Wire HWg-UniCalibrator software
Compatible with Poseidon2, Ares and other HWg devices
The Sensor 0-20mA 1W-UNI can be connected to all HWg devices with a 1-Wire-UNI-capable RJ11 connector.
- Poseidon2 (including 3266, 3268, 3468, 4002)
- Ares 12 / Ares 14
- Poseidon 2250 and Poseidon 4002
- SiteMon5
- IoT devices with RJ11 sensor connection (e.g. NB-2x1Wire, SD-2x1Wire)
Ares 12 with GSM/GPRS: The Ares 12 device supplies the current sensor, reads the data and, in the event of a threshold violation, sends SMS messages (up to 5 numbers), alarm e-mails or reports to an online portal. The internal Ares battery provides backup power for the sensor.
Installation in a few steps
The Sensor 0-20mA 1W-UNI is connected to the industrial probe via the terminal block and to the monitoring device via RJ11.
- Place the sensor on the wall or on a table in an indoor location
- Connect the external 0-20 mA probe (“Source” type) to terminals I+ and I− on the terminal block
- Connect the RJ11 port of the sensor to the 1-Wire port of the Poseidon2 or Ares device (max. 60 m total cable length)
- If more than two sensors are connected to one port: use a “1-Wire hub Power” to boost the supply
- The sensor appears automatically in the configuration interface of the connected device
- Name it there and set the SafeRange (thresholds) for alarms
- Optional: calibrate the sensor with the 1W-UNI USB Calibrator and convert it to the desired unit
Why the Sensor 0-20mA 1W-UNI is the right choice
Almost any industrial probe connectable
For all current-sourcing 0-20 mA probes (“Source” type).
Galvanically isolated
Protects the monitoring device from interference from the industrial sensor.
Calibratable
8-point curve for precise adaptation to the probe.
Unit conversion
Display directly in mm, m, hPa or ppm instead of only in mA.
Daisy-chain capable
Two RJ11 ports for series connection with further sensors.
24-month warranty
According to the manufacturer with a 24-month warranty from the date of purchase.
Practical application examples
- Current measurement with industrial probes
- Connection of current transformers
- Connection of electronic scales
- Connection of pressure transmitters or other industrial sensors
- Measurement of the concentration of CO₂ or other gases
- Level measurement in tanks
Practical example: A level sensor with a 4–20 mA output measures the level of a diesel tank and is connected via the Sensor 0-20mA 1W-UNI to an Ares 12. Thanks to the 8-point calibration and unit conversion, the level appears directly in metres in the web interface, e-mail and SMS. If the level falls below the defined threshold, the Ares device sends an SMS via GSM to up to five phone numbers – even without a LAN connection at the site.
Frequently asked questions
What is the HW group Sensor 0-20mA 1W-UNI and what is it used for?
The Sensor 0-20mA 1W-UNI is a galvanically isolated signal converter that measures a 0-20 mA current from an external industrial probe and passes it via the 1-Wire-UNI bus (RJ11) to a Poseidon2 or Ares device. It is used to integrate industrial sensors such as current transformers, pressure transmitters, scales or level probes into HWg monitoring systems.
Are there different variants or options?
No. The Sensor 0-20mA 1W-UNI is offered as a single version. There are no variants or options for this model.
What does “Source” type mean?
“Source” means that the connected probe supplies the current itself (current-sourcing output, typically a 4-wire probe with separate power supply). The Sensor 0-20mA 1W-UNI only measures this current and does not power the current loop. For probes that are to be powered by the converter (“4-20mA sink”), the Sensor 4-20mA 1W-UNI is available.
Which devices is the sensor compatible with?
The sensor can be connected to Poseidon2, Ares 12/14, Poseidon 2250, Poseidon 4002 and SiteMon5 – in general to HWg devices with a 1-Wire-UNI-capable RJ11 port.
How accurately does the sensor measure?
The sensor measures in the range 0–20 mA with an accuracy of 2 % of the full 20 mA range (at 25 °C) and a resolution of 0.1 mA. Measurement takes place once per second. With the 8-point calibration, the measured value can additionally be adapted to the respective industrial probe.
How many sensors can be operated on one port?
One active RJ11 port can supply a maximum of two sensors of this type. For more sensors or to branch the bus, the “1-Wire hub Power” is recommended, which is powered by its own power supply. The total cable length must not exceed 60 m from the active port.
How can the measured value be converted into other units?
By default, the measured value is output in [mA]. With the calibration tool (1W-UNI USB Calibrator with software for MS Windows), a conversion into other units such as [m], [mm], [hPa] or [ppm] can be set directly in the sensor, so that e-mails, SMS messages and the web interface also display the correct value.
Is the sensor protected against overcurrent?
Yes. The input is protected by a fast-acting 63 mA protective fuse; in addition, the current input is galvanically isolated from the 1-Wire-UNI bus.
Questions about the Sensor 0-20mA 1W-UNI?
Our support team in Germany provides free advice on selection, sensing technology and configuration.
Bus Properties:
- Bus Type: 1Wire-UNI (RJ11)
- Compatible Devices: Poseidon2 xxxx, Ares xx, Poseidon 2250, Poseidon 4002, SiteMon5
- Connection: 2x RJ11 (sensors can be connected in series)
- Maximum Distance: 60m (total cable length from the active port)
- Galvanic Isolation: 1Wire-UNI bus is galvanically isolated from the 0-20mA input
Power Supply:
- Power Supply: Via 1Wire-UNI bus (RJ11)
- Power Limit: One active RJ11 port can supply up to two sensors
- Power Amplification: Use "1-Wire hub Power" for higher power
- Galvanic Isolation: 0-20mA input is galvanically isolated from 1Wire-UNI (RJ11)
Sensor Input:
- Connection: 2-pin terminal block (I+, I-)
- Supported Sensors: External current-sourcing sensors, "0-20mA DC (Source)" type
- Input Range: 0-20 mA (max. 30V)
- Input Protection: Fast-blow fuse - 63 mA
- Accuracy: 2% of full 20mA range / 25°C
Sensor Output:
- Resolution: 1 decimal place
- Displayed Units: Standard [mA] (conversion to [m], [mm], [hPa], [ppm] possible)
- Measurement Period: Once per second
Environmental Conditions and Dimensions:
- Operating Conditions: -40 to +85 °C (-40 to +185 °F) / 5 to 70% RH
- Dimensions: 65 x 80 x 30 [mm]
- Weight: 200 g
Additional Features:
- Calibration: Calibration tool available for MS Windows
- Calibration Points: 8 different points on a curve
- Unit Conversion: Programmable conversion from input voltage [V] to output units
- GSM/GPRS Monitoring: Compatible with Ares 12 for remote monitoring
- Backup Power Supply: Internal Ares battery provides backup power for the sensor
Monitoring devices
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Extension units
Accessories
Mounting Plate D Bracket for Ares and Poseidon2 Operating environment: -3°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 74 x 6 x 120 (W x H x D) / 58g Warranty: 24 months Wall mounting plate for Ares, Poseidon2 3266/68 and other products.
DB9 LapLink Cable 2m A LapLink cable (also known as Lablink or null-printer cable) is a cable used to connect two computers directly via a cable connection. Housing: Plastic Type: Cable
DIN-Rail Box Set A mounting kit for installing HW-group devices on a DIN rail. Applications and Use: Mounting kit for installing HW-group devices with metal housing on a DIN rail. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 45 x 11 x 105 (W x H x D) / 22g
Mounting Kit Screw set for mechanical mounting Applications and Use: Screw set for mechanical fastening
Mounting Plate E- 1U Rack (cabinet) mounting plate, 1U mounting for HW-group Ares and Poseidon2 devices Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 127 x 45 x 94 (W x H x D) / 137g Warranty: 24 months Rack (cabinet) mounting plate, 1U mounting for HW-group Ares, Poseidon2 3266/3268 and other products.
Mounting Plate L DIN Rail DIN rail mounting plate for Ares, Poseidon2 3268, and other products. Features: Metal housing Wall mounting Applications and Use: Profiles for metal-encapsulated HWg devices for wall mounting. Dimensions: 150 x 120 x 45 (W x H x D) / 65g Warranty: 24 months
Mounting Kit for Poseidon2 4002 and HWg-SMS-GW3 Applications and Use: Mounting kit for Poseidon2 4002 and HWg-SMS-GW3 Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 136 x 45 x 16 (W x H x D) / 165g Warranty: 24 months
Rack Shelf 1U A versatile solution for easy mounting of HW-group devices in 1U racks. Operating environment: -30°C - 85°C / 0%RH - 100%RH Storage environment: -30°C - 60°C / 5%RH - 95%RH Dimensions: 485 x 44 x 104 (W x H x D) / 597g Warranty: 24 months Housing: Metal Type: Wall mounting This shelf makes it easy to use devices in racks. You can even combine different 1U products and sensors.
Software
Manufacturer information:
HW group s. r. o.
Rumunská 26
Prague, 120 00
Czech Republic
Phone: +420 222 511 918
Email: sales@hwg.cz
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
