--- type: product schema_version: 1 stock_number: "93879-5" canonical_url: "https://www.artisantg.com/93879-5/Vaisala-HMP233" json_url: "https://www.artisantg.com/93879-5/Vaisala-HMP233.json" generated_at: "2026-11-07T08:39:08.517Z" last_updated: "2026-10-14T13:00:51.160-05:00" --- # Vaisala HMP233 Humidity and Temperature Transmitter _Summary and Categories are this item's record. The description sections and FAQ are machine-assisted and can contain errors; where they disagree with the record, the record is correct, and where description sections disagree with each other, Details wins._ ## Summary - Manufacturer: Vaisala - Model: HMP233 - Condition: Used and in Excellent Condition - Price: $295.00 USD - Availability: In stock, 2 available - Warranty: 1-Year Warranty with 30-Day Return Guarantee - ITAR restricted: No - Shipping weight: 3.5 lb, estimated - Shipping dimensions: 12X9X6 in, estimated ## Categories - Lab & Analytical > Analytical Instruments (primary) ## Details This unit does not include cables. ### Configuration - Transmitter Type: RH+T - Display: No Display - Power Supply, Alarm Output, and Connectors: 115 V, No Connectors - Serial Interface: RS 232C - Sensor Protection: PPS Plastic Grid & Stainless Steel Netting (16720HM) - Analog Output Signals:     - Channel 1: 0...1 V     - Channel 2: 0...1 V - Parameters for the Analog Outputs:     - Channel 1: RH (0...100%RH)     - Channel 2: T (-20...+80°C) - Analog Output Range for Temperature: -20...+80°C - Units: Metric - Installation Kit for Duct Mounting: No - Regaining Option and Sensor Type: 1 - Manual Language: English Part Number: HMP233-A1A1A2CC12A1A1B ## Overview Industrial-grade microprocessor-based humidity and temperature transmitter designed for installation in confined spaces, capable of operating in temperatures up to +80 or +120 °C. Provides measurement of relative humidity and temperature, with optional calculations for dewpoint, frostpoint, absolute humidity, mixing ratio, wet bulb temperature, and enthalpy. Features dual analog outputs and supports serial communication via RS-232C or optional RS-485/422 current loop modules. Configurable with or without local display and keypad. Probe cable lengths available up to 10 meters. IP65-rated housing with downward-facing cable bushing for environmental protection and compatibility with process environments requiring tight installation. Powered by 24 V DC/AC supply. Weight approximately 2.2 lbs with compact probe design. ## Function Measures relative humidity and temperature, converts sensor data to analog current or voltage signals, transmits data via wired connection, provides accurate and stable measurements in diverse environmental conditions, and supports various mounting options for flexible installation. ## Platform RS-485 serial interface, analog voltage or current outputs, suitable for industrial automation systems, HVAC monitoring, meteorological stations, remote sensing applications, compatible with dataloggers, PLCs, and SCADA systems, ensures precise environmental control through robust sensor technology, operates in extreme conditions, interfaces via weatherproof connectors, seamlessly integrates into existing control networks, powered by 10-35V DC, reports relative humidity and temperature in harsh environments. ## Application Measures relative humidity and temperature in demanding industrial environments with high accuracy and stability. Transmitter outputs 4-20mA or voltage signals proportional to measured values, interfaces via RS-232/RS-485 for digital communication and configuration. Integrates with SCADA systems, PLCs, and data loggers through analog or Modbus protocols. Features heated probe option for condensing environments, chemical purge for sensor recovery. Commonly deployed in pharmaceutical manufacturing cleanrooms, semiconductor fabrication facilities, HVAC control systems, meteorological stations, food processing plants, and environmental test chambers where precise humidity and temperature monitoring is critical for process control and regulatory compliance. ## Accessories Features an 8-pin M12 male connector for power (10-35 VDC / 24 VAC), two configurable analog outputs (0-1V, 0-5V, 0-10V, 4-20mA, 0-20mA), and a serial service interface. Optional accessories include an integrated LCD display and two relays. Associated equipment includes a USB service cable (219685) for PC connection and an HM70 hand-held meter for field calibration. Mounting hardware includes a duct installation kit (210697), ball valve set (BALLVALVE-1), wall mounting plate (210620), and a rain shield (DTR13). ## Interface One M12 4-pin male connector for power supply and signal output. Provides analog output signals: 0-1 V and 4-20 mA for humidity and temperature. Optional digital output via Modbus RTU over RS-485 using the same connector. Equipped with a robust stainless steel probe housing for sensor element and cable gland for external cable connection. Requires a power supply of 9-35 VDC. ## Images - - - -