COMPACT WEATHER STATION
MaxiMet GMX552
Compact weather station with onboard WBGT and Thermal Work Limit (TWL), for worker safety.
GMX552 is the heat stress model, new in 2026. It measures wind, temperature, humidity and pressure like the rest of the range, and calculates both WBGT and Thermal Work Limit where people are working. WBGT tells you how stressful the conditions are. TWL tells you how much work can be done safely, in W/m².
WBGT and TWL heat stress
For worker safety monitoring
Ultrasonic wind sensing
0 to 60 m/s, no moving parts
Temperature, RH and pressure
Alongside wind and WBGT
One cable, one output string
IP66 rated
WHERE IT SITS
MaxiMet GMX552 in the MaxiMet range
THE DIFFERENCE
What makes this one different
WBGT and Thermal Work Limit are calculated where the people are, rather than inferred from a weather station somewhere else on the site. TWL was added by firmware, so existing compatible units can be updated with no new hardware. It is unheated, and it is the heaviest model in the range at 1.29 kg.
SPECIFICATION
Full specification
Figures from the current datasheet. Confirm the current issue before ordering.
Measurement
| Measures | Wind, temperature, humidity, pressure, WBGT and TWL heat stress |
|---|---|
| Wind range | 0 to 60 m/s |
| Wind speed range | 0 to 60 m/s |
| Rainfall | Not measured |
| Solar radiation | Not measured |
| Compass | 2-axis |
| GPS | Optional |
| Options | Wet bulb temperature sensor, available as an optional accessory to increase WBGT accuracy. GPS. WBGT and Thermal Work Limit (TWL) are calculated as standard |
| Temperature range | -35 degrees C to +70 degrees C |
Environment
| Ingress protection | IP66 |
|---|---|
| Heating | Not offered |
Mechanical
| Weight | 1.29 kg |
|---|
Approvals and documentation
| Datasheet | MaxiMet_GMX552 |
|---|
COMPARE
MaxiMet GMX552 against GMX500, GMX552, GMX501: only what differs
| Attribute | GMX500 | GMX552 | GMX501 | |
|---|---|---|---|---|
| Measures | Wind, T, H, P | Wind, T, H, P, WBGT | Wind, T, H, P, solar | |
| Heating | Optional | Not offered | Optional | |
| Weight | 0.7 kg | 1.29 kg | 0.8 kg |
Show the 1 rows that are the same
| Attribute | GMX500 | GMX552 | GMX501 | |
|---|---|---|---|---|
| Ingress protection | IP66 | IP66 | IP66 |
GMX552 against the two models nearest to it. The whole range is on the MaxiMet page. Compare the whole range
ACCESSORIES
Accessories for the MaxiMet GMX552
The parts that fit the MaxiMet GMX552: cable, mounting, set-up kit and spares.
In the box. Every MaxiMet ships with its mating connector (1405-PK-069).
Cables
- Cable, 4 pair, cut to length
- Cable, 4 pair, 15 m, pins fitted
Connectors
- Spare connector
Mounting
- Bracket for wall mounting or pole clamping
- Support tube, 0.5 m
Set-up and configuration
- USB set-up cable, 1.8 m
Spares
- Temperature and humidity sensor, serial numbers up to 2233xxxx
- Temperature and humidity sensor, serial numbers 2234xxxx onwards
Heat stress spares
- Wet bulb sensor, 0.5 L
- Wet bulb sensor, 1 L
- Black globe, with locking screw and seals
- Black globe temperature sensor
- Wet bulb PT100 temperature sensor
- Wet bulb sunshade
- Wet bulb bottle and retainer, 0.5 L
- Wet bulb bottle and retainer, 1 L
- Wick and O-ring, 0.5 L wet bulb
- Wick and O-ring, 1 L wet bulb
Order accessories with your sensor or on their own. Quote the part number when you get in touch. See the accessories datasheet
QUESTIONS
Specification questions about the MaxiMet GMX552
Which parameters does the MaxiMet GMX552 measure?
The MaxiMet GMX552 measures wind speed and direction, air temperature, humidity and pressure, with a 2-axis compass and optional GPS. From these and its black globe it calculates WBGT and Thermal Work Limit onboard.
What is Thermal Work Limit and how is it different from WBGT?
Thermal Work Limit (TWL) is the maximum sustainable work rate, in W/m², that an acclimatised worker can safely maintain in the measured conditions. It was developed for Australian mining and is widely used in mining and across the Middle East. WBGT answers how stressful the conditions are. TWL answers how much work can be done safely. The GMX552 calculates both, and many organisations monitor both.
Can an existing GMX552 get TWL?
Yes. TWL was added by firmware update with no additional hardware. It is standard on new systems, and existing compatible units can be updated.
Which parameters does the MaxiMet GMX552 not measure?
The MaxiMet GMX552 does not measure rainfall and solar radiation.
What wind speed range does the MaxiMet GMX552 cover?
The MaxiMet GMX552 measures 0 to 60 m/s.
What ingress protection does the MaxiMet GMX552 have?
The MaxiMet GMX552 is sealed to IP66.
Is the MaxiMet GMX552 heated?
No. Heating is not offered on the MaxiMet GMX552.
How much does the MaxiMet GMX552 weigh?
The MaxiMet GMX552 weighs 1.29 kg.
Where can I find the datasheet for the MaxiMet GMX552?
The datasheet is MaxiMet_GMX552. It is linked in the documentation section of this page.
Have an application to discuss?
Speak to our team
Tell us what you need to measure, where and under what conditions. We’ll help you work out the appropriate approach.
Enquiring about MaxiMet GMX552
- Our team replies. Not an account manager, and not a queue.
- We aim to respond in one working day. Monday to Friday.
- No obligation. Just honest advice on whether Gill is the right fit.