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Digital panel meters and large displays with precision and reliability
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Made in the UK for over 27 years, Shipped Worldwide

Temperature and Humidity large displays

Temperature and humidity can have a big effect on product quality, ease of handling and product lifetime.

We offer a range of sensors and displays to suit your environmental monitoring needs perfectly, so that you and your team can see at a glance your exact environmental conditions.

large digital temperature display

Sensors can be local or remote, suited for industrial, laboratory and quality applications.

Digit sizes are available from 14mm up to 400mm.

refrigeration temperature display with blue digits

Large digit temperature display with red digits

Our displays are designed for washdown environments, with IP65 cases, sealed all-round, with glanded cable entries.


An example of large format temperature and humidity displays for use in ultra-high precision manufacturing cells.

This system also data-logs to the cloud and creates real-time graphing so the quality team can validate the history of the environment.

Temperature and humidity data logging with web access for mobile and desktop devices.

Data logging temperature and humidity displays

Temperature graphing


Large digit temperature displays in fire service applications:

Here is a mobile temperature display we designed and built for Lincolnshire Fire Service, for use outside in their training exercises.

It measures the temperature in 3 zones in a burnining room and data logs the drop in temperature as the fire is extinguished.

Data is saved to the cloud over WiFi, so teams and regional fire services can share the graphs in real time, to determine best strategies for fighting various fire types.

Data logging temperature display for the fire brigade


This large display is portable and connects directly to a type K thermocouple, which is mounted in the fire zone. The digits are 102mm high and are ultra-bright for clear visibility outside in direct sunlight.

The display can store the peak flame temperature, for later recall. It is sealed IP65 all round ...

Large digital temperature display being used to monitor Cobra fire extinguisher system in UK



New: Ex nR Atex Certified build options available

Atex and Ex nR certified explosion proof andons, digital panel meters, transmitters, bargraph displays and large digital displays

For hazardous areas we can offer the following explosion proof options on most models. Tell us what you need and we will be pleased to quote for Atex certified systems
  • Zone 1 ii 2 G Ex px iiC T6/T5/T4 Gb - Requires pressurised air system
  • Zone 2 ii 3 G Ex nR iiC T6/T5/T4 Gc - any product
  • EXD Zone 2 on request - POA


Ex nR certified large digital displays


The London Electronics ATEX certified products are supplied certified for use in the condition in which they are supplied. No liability will be assumed for any loss or damages of any nature, direct or indirect, including any loss of profits or consequential damages, injury or death suffered or incurred by the buyer as a consequence of failure to install, use and/or apply the product within the scope of the installation document and certification supplied.




A typical display with 57mm high digits to show temperature and humidity. We can also supply displays with 102mm, 150mm, 200mm, 300mm and 400mm high digits.

simple temperature and humidity monitor display



Individual displays with 57mm high coloured digital displays to show temperature, humidity and barometric pressure. Sensors are shown also. We can also supply displays with 102mm, 150mm, 200mm, 300mm and 400mm high digits.

simple temperature and humidity monitor display



Individual display with 102mm high digits to show temperature and humidity using our P18-1 combined temperature and humidity sensor.

4 inch  single line temperature and humidity display



Temperature & Humidity transmitters

Ideal for monitoring temperature and humidity in production environments. Choose either 2 x 4-20mA output or RS485 Modbus RTU output.

P18 humidity transmitter

Datasheet
Manual for Modbus P18
Manual for analogue P18L

New - LCD display version now available
The New P18-D includes a backlit LCD display, to show Absolute Humidity, Relative Humidity, Temperature and Dewpoint.

Temperature and Humidity display with dewpoint

A sealed pushbutton area lets you select either of the 4 parameters to display.

Key points :-

1. Wide range suits most industries
2. Analogue or serial outputs
3. Choice of filters for the sensor
4. Rugged, reliable, smart.


dimensions of temperature and humidity transmitter

The LEL18 transducer is for the continuous measurement and conversion of relative humidity and ambient temperature into a digital or analogue voltage or current standard signal. The transducer may be programmmed and calibrated through the RS-485 interface.

Sensor shields allow the transducer to operate in various ambient conditions, dusty, dry, corrosive etc.. The transducer is designed to be mounted on a wall.

The LEL18 transducer performs following functions:

  • calculation of selected physical quantities, (dew-point temperature, absolute humidity)
  • conversion of measured quantities into a linear output signal
  • memory of maximum and minimum values for each value
  • programming of the measurement averaging time
  • servicing of RS-485 interface in MODBUS RTU mode.

Technical Data
Basic parameters:
- relative humidity measurement (RH) 0...100% without condensation
- basic error +/- 2% for rh 10...90% +/- 3% for remaining range
- hysteresis for humidity measurement +/- 1%
- temperature measurement range (T) - 30...85oC
- temperature conversion accuracy +/- 0.5% of the range
- calculates abs. humidity (a) [g/m3] dew-point temp. (Td) [oC]
- additional errors: temp. effect +/- 25% of basic error/10oC



Choose from these other useful large digital display functions ...



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