Ahmedabad: An engineer at a water purification company filed a police complaint on Sunday after two high-value sensors worth Rs 9 lakh were stolen from a plant near the Shankarbhavan Metro Bridge in Shahpur. The complainant, Jatinkumar Chavda, is employed as a site in-charge with Bio Green Technology Pvt Ltd. The company operates a plant that treats wastewater near Ramapir Temple under the metro bridge. According to the complaint filed with Shahpur police, two sensors installed on a machine were stolen, probably on Saturday between 4am and 8am. The stolen sensors were used to check water parameters such as pH, dissolved oxygen and turbidity every four hours — the data collected is sent through WhatsApp by the workers. Each sensor is valued at Rs 4.5 lakh, the FIR states.“The security at the plant is managed in two shifts by two guards who were on duty that day. On the morning of May 17, supervisor Rohit Guruva informed the complainant over a phone call about the missing sensors. Upon reaching the site, Chavda saw that wires were cut with a sharp tool and both sensors were missing,” according to the FIR. Both security guards claimed they did not know about the theft. Despite searching the plant and surrounding areas, the stolen items could not be found. Based on instructions from his supervisor, Chavda approached Shahpur police and filed a complaint. An FIR has been lodged against an unknown person, and the investigation is on.