Marmonix MHT-50 (MHT50) Single-Use USB Temperature & Humidity Data Logger

The Marmonix MHT-50 data logger (also typed MHT50 or MHT 50) is a slim, single-use USB recorder that logs temperature from −30 to +70 °C and humidity from 0 to 100% RH, then turns its record into a PDF report and a CSV file the moment it is plugged into a computer. Accuracy is ±0.5 °C between −20 and +40 °C and ±3% RH at 25 °C in the 20–80% band. It has no screen: three LEDs (blue for start delay, green for in-limit logging, red for alarm) show its state instead. The default run is 90 days at a 5-minute interval with a 30-minute start delay and 2–8 °C / 20–80% RH alarm limits, all adjustable. The IP66 body measures 83.5 × 27.7 × 7.5 mm, weighs 16 g and uses a CR2032 cell (part number 7603593). See all Marmonix data loggers, or the MHT-51 logger with LCD if readings must be visible on arrival.

MarMonix MHT-50 temperature and humidity data logger Overview

The MarMonix MHT-50 is a compact, high-precision, single-use USB temperature and humidity data logger engineered for strict environmental validation during logistics, cold storage, and cleanroom monitoring. Designed for immediate field deployment, it features an IP66 water- and dust-resistant casing, internal precision sensors, and pre-configured or customizable logging intervals ranging from 1 minute up to 24 hours.

Upon reaching the destination, users simply connect the MHT-50 directly to any standard computer USB port. The device automatically generates tamper-evident PDF analytical reports and raw CSV datasets instantly—eliminating software installation friction and accelerating cargo release workflows.

Key Features & Capabilities

What the MHT-50 gives you on a shipment:

• Plug-and-Play USB Interface: Instant automatic PDF and CSV report generation upon connection—no specialized software or driver installation needed.
• Wide Dynamic Range: Measures temperatures from -30 °C to +70 °C (-22 °F to +158 °F) and 0 to 100% RH with ±0.5 °C temperature accuracy and ±3% RH humidity accuracy.
• Tri-Color LED Status Diagnostics:
  • Blue LED: Indicates start-delay mode (default 30 min delay for thermal equilibrium).
  • Green LED: Confirms active logging within safe predefined thresholds (default: 2°C to 8°C & 20–80% RH).
  • Red LED: Instantly flags temperature/humidity excursion alarms.
• Rugged Enclosure: Rated IP66 ingress protection for reliable performance in condensing refrigerated containers and wet environments.
• Ultra-Slim & Lightweight: Pocket-sized form factor (83.5 × 27.7 × 7.5 mm, 16 g) easily inserts into pharmaceutical shippers, insulated thermal boxes, and pallet packages.

MarMonix MHT50 Technical Specifications

Case study: setting up a screenless logger for a long sea-freight leg

A shipper sends moisture-sensitive goods in a refrigerated container on a voyage of several weeks. Nobody can open the box on the way, so the logger has to be set up correctly before it leaves and must survive condensation inside the container.

The set-up choices that decide whether the report is useful:

• Duration first: pick a run length (7 to 360 days) longer than the planned voyage plus delays, then an interval (1 min to 24 h) fine enough to catch short swings.
• Time zone: the report uses UTC+0:00 unless changed, so set it to match the shipping documents and make excursion times easy to trace.
• Limits: enter the temperature and humidity band agreed for the cargo instead of keeping the default limits by habit.
• Start: hold the button for 3 seconds; the blue LED blinks every 10 seconds until logging begins after the start delay.

On arrival, the LED gives a quick first answer: green blinking means it is logging inside the limits, red blinking means it has registered an alarm, and the PDF then shows when and for how long. A red LED that stays on without blinking can mean the logger is damaged, so it should not be relied on. The IP66 body is sealed against dust and water jets, which suits the condensation found in refrigerated containers.

MHT-50 logger: quick answers

Does the MHT-50 have a display?

No. It reports its state through three LEDs: blue during the start delay, green while logging inside the limits, red for an alarm. The data itself is read from the PDF or CSV on a computer.

How do I start the MHT-50?

From the shutdown state, press and hold the Start button for 3 seconds. The blue LED blinks every 10 seconds during the start delay (30 minutes by default), then logging starts by itself.

Which time zone does the MHT-50 report use?

UTC+0:00 by default. The time zone can be customised before the run so the times in the report match local delivery records.