Product Overview
The Honeywell RAE Systems C03-0953-000 is a 4R+ electrochemical hydrogen fluoride (HF) sensor. Honeywell Technical Note TN-114 specifies a range of 0.5 to 10 ppm with 0.5 ppm resolution (the 2025 price list also describes it as "minimum detectable 0.5 ppm"). It is a plug-in replacement sensor for the ToxiRAE Pro, AreaRAE Plus, and AreaRAE Pro.
This sensor is not for the MultiRAE family. Honeywell states that MultiRAE instruments cannot use HF or HCl sensors because those gases react with the gas plate and are absorbed in the instrument. On AreaRAE Plus and AreaRAE Pro, firmware 1.06 or higher is required, and Honeywell advises against installing HF or HCl sensors in slots 2 or 5.
Specifications
- Sensor type: Electrochemical (4R+ EC HF)
- Gas detected: Hydrogen fluoride (HF)
- Range: 0.5 to 10 ppm
- Resolution: 0.5 ppm (TN-114). The AreaRAE Plus/Pro user manual lists 0.1 ppm for the installed instrument; see the notes below.
- Bias / equilibration: TN-114 lists bias as zero. TN-201 states that a freshly installed HF or HCl sensor needs at least 3 hours for the baseline to stabilize before calibration. Once installed, the bias remains on even when the instrument is off.
- Temperature range: -4°F to 104°F (-20°C to 40°C)
- Pressure range: Atmospheric ±10%
- Operating humidity: 15 to 90% RH
- Operating life: 15 months in air
- Warranty: 15 months from date of shipment
- Calibration span gas: 10 ppm HCl (surrogate), or 5 ppm NO2 with the instrument's default 6 ppm HF span (TN-201 Option 2)
- Calibration zero gas: Clean ambient air or zero air
Honeywell does not publish a T90 response time for this part in TN-114. HF and HCl are reactive gases, and Honeywell says these sensors are not as straightforward to calibrate as other electrochemical sensors. Follow Technical Note TN-201. Two official span options:
- Option 1 (HCl surrogate): 10 ppm HCl in nitrogen, delivered with Teflon tubing and a T-type pressure-equalizing fitting. The gas path must be pre-soaked; otherwise the target concentration may never reach the sensor. See hydrogen chloride (HCl) calibration gas (10 ppm / nitrogen is listed).
- Option 2 (NO2 surrogate, HF only): 5 ppm NO2 with the default 6 ppm HF span setting left unchanged. Honeywell notes that this option does not require the HCl pre-soak and reduces calibration time. See nitrogen dioxide (NO2) calibration gas (5 ppm options are listed).
Store unused sensors in the original sealed packaging at 39°F to 50°F (4°C to 10°C), gas-inlet side down. Honeywell recommends installing spare HF and HCl sensors within four weeks of receipt and keeping them away from solvent vapors, which can block or damage the electrodes or create a false baseline. Do not leave the gas inlet pointing upward for more than 12 hours a day.
TN-114 cross-sensitivity data include a large response to acetic acid, chlorine, and sulfur dioxide, and about 8 ppm reading from 10 ppm HCl. Those values are from a small sample of sensors and can vary.
Compatible Instruments
- Honeywell RAE Systems ToxiRAE Pro (PGM-1860 toxic-gas models)
- Honeywell RAE Systems AreaRAE Plus (firmware 1.06 or higher)
- Honeywell RAE Systems AreaRAE Pro (firmware 1.06 or higher)
Not compatible: MultiRAE Lite, MultiRAE, MultiRAE Pro, and other MultiRAE-family instruments.
(P/N: C03-0953-000)
