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SECURUS/Hardware/IoT controller and dry contact

IoT controllers and dry-contact sensors

Existing equipment often already provides operating states or readings. Dry-contact sensors read suitable volt-free contacts; controllers can connect digital, analog or serial signals depending on the model. SECURUS displays the agreed data centrally.

Milesight UC300, IoT controller
Milesight

UC300

IoT controller

Connects existing equipment: fault contacts, readings from pumps, heating systems and machines, also via Modbus.

Digital inputs
opto-isolated, 3–24 V DC, also as a pulse counter
Analog inputs
2 × 4–20 mA, 2 × 0–10 V
Temperature inputs
2 × PT100 (−200 to +800 °C)
Interfaces
RS232, RS485 (Modbus RTU)
Output
Relay, max. 3 A at 30 V DC or 250 V AC
Power supply
5–24 V DC or USB-C (permanent supply)
Battery life
not applicable, permanent power supply
Mounting
Desk, wall or DIN rail
Technical datasheet (PDF)
Dragino LHT65N-DC, dry contact sensor for potential-free contacts
Dragino

LHT65N-DC

Dry contact sensor for potential-free contacts

Reports the state of potential-free contacts, such as fault or status signals from equipment, and counts switching operations. With built-in temperature and humidity sensor.

Input
3-wire (VCC, GND, INT) for potential-free contacts
Features
open/closed, counting, opening alarm
Temperature
−40 to +80 °C, ±0.3 °C
Humidity
0–96 % RH, ±3 %
Power supply
built-in battery, 2,400 mAh
Battery life
up to 10 years (depending on transmission interval)
Dimensions
95 × 40 × 28 mm
Technical datasheet (PDF)
Dragino LT-22222-L, I/O controller
Dragino

LT-22222-L

I/O controller

Records digital and analog signals from existing equipment and can switch via relays.

Digital inputs/outputs
2 inputs, 2 outputs
Relay outputs
2 × 5 A at 250 V AC or 30 V DC
Analog inputs
2 × 0–20 mA, 2 × 0–30 V
Power supply
external DC voltage up to 24 V
Battery life
not applicable, permanent power supply
Dimensions
145 × 80 × 50 mm
Technical datasheet (PDF)
Dragino RS485-LB, RS485 and Modbus converter
Dragino

RS485-LB

RS485 and Modbus converter

Collects readings from devices with an RS485 or Modbus interface, for example from meters or controllers.

Interfaces
RS485, UART (3.3/5 V), I²C
Power for external sensors
switchable 3.3 V and 5 V outputs
Power supply
Battery 8,500 mAh (Li-SOCl₂) or solar with rechargeable battery (LS variant)
Battery life
several years (manufacturer's specification, depending on transmission interval and connected devices)
Protection rating
IP67
Operating temperature
−40 to +85 °C
Technical datasheet (PDF)

Technical data according to the manufacturer's datasheet, battery life under the stated conditions. All devices shown transmit via LoRaWAN. In addition to these examples, we also use LoRaWAN devices from other manufacturers depending on requirements.

Check equipment signals and interfaces

For machine or pump monitoring, first identify the available signal. A qualified contractor checks contact type, voltage and interface. A Modbus connection alone does not guarantee integration; registers and meaning must be known.

Relevant use cases
Heating monitoringMachine and equipment monitoringUtility meters
FAQ

Sensor selection questions

What is a volt-free contact?

It provides a switching state without its own output voltage. A qualified contractor checks compatibility with the sensor.

Which device is right for you?

We select the right device with you, integrate it into SECURUS and deliver it ready for use.

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