The battery required for the MSF-01 sensor is Li 3.6v 8500mAh. When your original battery dies you can source your own with the above specifications, or AVT Reliability® can supply one at £20 (GBP).
Please note: To maintain the ATEX certification and to preserve the warranty of our sensors, we recommend using the batteries supplied by us. Other C type Batteries could be used but you would lose the ATEX certification.
Get in touch if you need a new battery- enquiries@avtrelaibility.com