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HD33MT.4– Data Logger for Weather Station, 4G

Make:  Delta Ohm       Model: HD33MT.4
✅ Datalogging of temperature, relative humidity, dew point temperature, atmospheric pressure, solar radiation, rainfall amount, wind speed and direction
✅ Available in two versions: with input for standard RS485 MODBUS-RTU sensors or with inputs for dedicated Delta OHM sensors
✅ GSM/GPRS module for remote monitoring
✅ Data sending via email, FTP and to an HTTP server (e.g. Delta OHM Cloud)
✅ Can be powered by mains or photovoltaic panel (with optional external power supply unit)
SKU: DL-HD33MT.4-DEL Category:

HD33MT.4 most universal compact meteorological data logger series with universal 4G/3G/2G/GPRS modem.

Designed to work with power supply from a solar panel, very low power consumption; solar charger and regulator are already integrated in this logger. Just add a solar panel and the rechargeable battery and you are independent from any further power source. But of course it can also be powered directly from a power supply if that is more convenient.

Key Points:

  • 4 analog independently configurable inputs (0…50 mV, -50…50 mV, 0…1 V, 0…10 V, 0…20 mA or 4…20 mA, Pt100, Pt1000, thermocouple, potentiometer, pyrgeometer).
  • 2 voltage-free counting contact inputs (e.g. a tipping bucket rain gauge and a cup anemometer can be connected).
  • One RS485 port with Modbus-RTU protocol, configurable as “Master” or “Slave”.
  • One SDI-12 “Master” port compatible with version 1.3 of SDI-12 protocol.
  • 2 voltage-free contact alarm outputs.

Delta ohm




4G / E version equipped with 4G + ETHERNET

Power Supply

if integrated battery is used: 18…28 Vdc (externally powered)
or 12 Vdc (photovoltaic panel)
if integrated battery is not used: 7…28 Vdc (externally powered)

Power Consumption

< 5 mA during measurement /
< 1 A peak during GSM activity

Integrated lead acid battery


Switched power supply output

Active only when external sensors have to be powered


External, included

Measuring & logging Interval

1, 2, 5, 10, 15, 30 seconds / 1, 2, 5, 10, 15, 30, 60 minutes

Internal Memory

Circular management or stop logging if memory is full

Number of samples (depending on the number of the detected quantities)

from 242,850 to 858,070


Sending of alarm e-mail and SMS.
Two voltage-free (NO) contact alarm outputs.

Operating Conditions

-40…+70 °C / 0…100 %RH without display
-20…+70 °C / 0…100 %RH with display

Internal clock

High stability ± 2 ppm (0…+40°C)/± 5 ppm (-40…+70°C)


Optional custom LCD

Connection to PC

USB port with mini-USB connector – Free software


270 x 170 x 110 mm

Protection Degree



– 4 analog standard inputs
– 2 voltage free contact inputs
– 1 RS485 MODBUS-RTU input
-1 SDI-12 input
– 1 passive T/RH probe

Atmospheric Pressure

optional internal sensor


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