The Setra SRH200M3W1NNMFMXXX is a factory-configured Setra Model SRH200 humidity and temperature transmitter, set up as a wall-mount unit with a fixed probe, one sensor port, and a membrane filter, running on Modbus RTU digital output. It’s a cost-effective humidity and temperature sensor built around a capacitive sensing element with good long-term stability and resistance to pollutants, which the membrane filter option on this unit is meant to help with in dirtier air environments.
In actual application, since this unit communicates over RS485 Modbus RTU rather than a straight analog signal, you can run up to 32 SRH200 units on one bus, which is useful for monitoring several rooms from one controller. The housing is rated IP65/NEMA4 with quarter-turn bayonet screws for a quick, low-cost installation.
Setra also offers optional configuration accessories (SETRAPCA1 and SETRAPCA2) that let you set RS485 interface parameters, customize output scaling, or do a one or two point field adjustment of the RH and temperature reading, which is handy if you need to recalibrate on site without sending the unit back.
Before we quote this, we would normally check your BMS’s Modbus register map compatibility, whether the membrane filter is the right option for your air quality, and the baud rate and parity settings your network uses. Hope this helps.
