The smart sensor developer added GV and Munich Re to its investors in a round that took its overall funding to $36m in the past 18 months.

Helium, a US-based developer of internet-of-things (IoT) technology, completed a $20m series B round led by GV, a corporate venturing subsidiary of internet and technology group Alphabet, on Monday.

Venture capital firms Khosla Ventures and FirstMark Capital also participated in the round, as did Hartford Steam Boiler Ventures, the equipment insurer affiliate of insurance group Munich Re.

Helium produces smart sensors that are currently being trialled by partners in the healthcare, transportation, grocery, food and beverage industries. It has also…