Metis Engineering Cell Guard

  • ​Metis Engineering Ltd

Product Features

Cell Guard is a CAN-based environmental sensor for use with Battery Packs in Energy Storage Systems and Electric Vehicles. It measures absolute pressure, air temperature, VOCs, absolute humidity, relative humidity, dew point temperature, and shock load and duration.

For quick desktop analysis, use alongside the Cell Guard Development Kit.


Product Details

Introducing Cell Guard, a cutting-edge CAN-based sensor designed to revolutionise battery system monitoring. This versatile device measures absolute pressure, air temperature, Volatile Organic Compounds (VOCs), absolute air water content, relative humidity, dew point temperature, and acceleration. With configurable CAN bus speed and address, and an included CAN DBC file, Cell Guard integrates seamlessly into virtually any battery system, providing early detection of cell venting and moisture formation.

Cell Guard features a low power mode that continuously monitors the environment, transmitting data only when a set threshold is exceeded, thereby conserving energy. Additionally, its low side drive function pin, capable of 500mA, can be triggered when programmable thresholds are met, ensuring prompt response to critical conditions.

Equipped with a 5-pin automotive-rated Molex Nano-Fit Power connector, Cell Guard’s compact size and lightweight design allow for easy installation in most vehicles and energy storage systems. Developed in accordance with ISO26262 and rigorously tested to meet automotive standards, including ISO7637-2 2011, ISO 17650-2 2012, and ISO 17650-4 2010, Cell Guard ensures reliability and performance. Enhance your battery system’s safety and efficiency with the state-of-the-art Cell Guard sensor.

Product Features

  • Absolute Pressure: 0.3 to 1.2 Bar
  • Air Temperature: -40°C to +125°C
  • Volatile Organic Compounds (VOCs): 0 to 6553.5 ppm
  • Absolute Humidity: 0 to 35000mg/m3
  • Relative Humidity: 0 to 100%
  • Dew Point Temperature: 0 to 100°C
  • Shock load and duration up to ±24G

For quick desktop analysis, use alongside the Cell Guard Development Kit.

Typical applications for the Cell Guard

  • Battery Packs in Energy Storage Systems
  • Battery Packs in Electric Vehicles

Unit Specifications

Pressure SensorRange0.3 Bar to 1.2 Bar
Pressure SensorResolution0.0001 Bar
Pressure SensorAccuracy (0.3 to 1.1 Bar)0.0005 Bar
Pressure SensorMax Update Rate50Hz
Air Temperature [1]Range-40°C to 125°C
Air Temperature [1]Resolution1°C
Air Temperature [1]Accuracy (@ 24VDC)±1°C
Air Temperature [1]Max Update Rate5Hz
Volatile Organic Compounds (VOC's)Range0 to 65535 Raw
Volatile Organic Compounds (VOC's)Range0 to 6553.5 ppm
Volatile Organic Compounds (VOC's)Accuracy (Worse Case)15% [2]
Volatile Organic Compounds (VOC's)Max Update Rate1Hz
Absolute Humidity [3]Range0 to 35000mg/m3
Absolute Humidity [3]Resolution70mg/m3
Absolute Humidity [3]Accuracy (Worse Case)3% FSS
Absolute Humidity [3]Max Update Rate5Hz
Dew PointRange0°C to 100°C
Dew PointResolution0.5°C
Dew PointAccuracy (Worse Case)-2°C
Dew PointMax Update Rate5Hz
Relative HumidityRange0% to 100%
Relative HumidityResolution0.5%
Relative HumidityAccuracy (Worse Case)-2%
Relative HumidityMax Update Rate5Hz
Accelerometer [4]Range-24g to +24g
Accelerometer [4]Resolution0.01g
Accelerometer [4]Accuracy (Worse Case)0.1g
Accelerometer [4]Max Update Rate200Hz
Environment[5] Operating temperature-20°C to +70°C
CANBaud Rates [6]1000, 500, 250 & 125kbps
CANAddress Range [7]1 (0x01) to 2042 (0x7FA). Default = 0x30A decimal (Hex)
PowerVoltage Range9V to 16V (18V to 32V for 24V Version)
PowerCurrent (silent mode/low power @12V)35mA (7.5 mA)
Output PinVoltage Range [8]9V to 32V
Output PinCurrent500mA
Output PinTypeLow Side Drive

[1] Air Temperature accuracy is dependent on installation, heat from the sensor itself can affect this.
[2] % of meas. value, sensor drift is 1.3% of measured value per year of operation, 90% of the sensors will be within the typical accuracy tolerance.
[3] Humidity accuracy valid from 0 to 80 deg C IC temperature.
[4] Not normally fitted, only on variant with accelerometer option selected.
[5] For the VOC the stated accuracy is achievable between -10 and 50 deg C. Nominal max temperature range is -20 to 55degC for maximum life, absolute max for sensor die temperature is 70 deg C (air temp can be greater).
[6] The default settings are 500kbps and start address 778 (0x30A), the unit has no CAN termination.
[7] The unit uses 4 CAN address which are in consecutive order from address that the unit is set to.
[8] the function pin is protected to transients up to 40VDC but is not current limited, please ensure load is not above 500mA.
[9] The function of this pin is assigned when configuring the unit please refer to the manual.

Calculators and Convertors

Work out what you need for your project. Go to calculators and convertors

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Weight 15 kg
Dimensions 11.5 x 50 x 54.5mm
Series / Model


Not Fitted, Tripple Axis ±24g

Pressure Range

Temperature Range (°C)

Supply Voltage

Metis Engineering Cell Guard Ordering Info

Below is the model number configuration for the CG series from ​Metis Engineering Ltd.

Ordering example: CGA0P1G1H1V1

Series / Model (CG)


Accelerometer (AX)

Not Fitted
Tripple Axis ±24g

Pressure Range (PX)

0.3 – 1.2 Bar

Gas (G1)

      G1 – VOC

Humidity (H1)

      H1 – Humidity 5% – 95%

Supply Voltage (XX)

9 to 32Vdc

16 to 32VDC is not tested to ISO Standards

Metis Engineering Cell Guard Resources

Product Datasheet

Supporting Product Information

  • Energy
  • Renewables

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Metis Engineering Cell Guard