Honeywell TMS 9250 Series Technical Specifications
General Information
Manufacturer: Honeywell

Model Series: TMS 9250

Type: Thermal Mass Flow Sensor/Transmitter

Primary Use: Direct gas mass flow measurement for HVAC, industrial processes, and energy management.

Performance Specifications
Measurement Principle: Thermal dispersion (constant temperature differential)

Flow Range:

Air/Gas: 0–25 to 0–150 SFPS (standard feet per second) [adjustable]

Custom ranges available for specific gases (e.g., CO₂, N₂, O₂)

Accuracy: ±1% of reading (±0.5% with calibration)

Repeatability: ±0.2% of reading

Response Time: <1 second (typical)

Outputs & Communication
Analog Outputs:

4–20mA (isolated, user-scalable)

0–10V DC (optional)

Digital Communication:

Modbus RTU (RS-485)

BACnet MS/TP (optional)

Relay Outputs: 2× SPDT (alarm/control, 5A @ 250VAC)

Electrical & Environmental
Power Supply: 18–30V DC (24V typical)

Power Consumption: 3.5W max

Operating Temperature:

Sensor: -40°C to +85°C (-40°F to +185°F)

Electronics: -20°C to +60°C (-4°F to +140°F)

Humidity: 0–95% RH (non-condensing)

Ingress Protection: IP65 (sensor), IP54 (transmitter)

Mechanical Specifications
Sensor Material: 316L stainless steel (standard)

Process Connections:

Insertion Probe: 1/2" NPT or flanged

Inline Pipe: 1" to 12" diameters (customizable)

Weight: 0.5–2.5 kg (varies by configuration)

Certifications & Compliance
Safety: UL, CE, RoHS

Explosive Atmospheres: ATEX / IECEx (optional)

EMC: EN 61326-1

Key Features
✔ No moving parts – Low maintenance, high reliability
✔ Gas-specific calibration (supports over 50 gases)
✔ Built-in temperature compensation
✔ LCD display (local readout & configuration)
✔ Dual-channel measurement (optional, for redundancy)

*(For full datasheets or gas compatibility lists, refer to Honeywell document 34-0000-000.)*

Typical Applications:

HVAC airflow monitoring

Combustion control (O₂/CO₂ flow)

Compressed air/gas systems

Biogas & emissions monitoring