RAE SYSTEMS C03-0982-000 Formaldehyde HCHO Sensor User Manual
- June 3, 2024
- RAE Systems
Table of Contents
FORMALDEHYDE (HCHO) SENSOR IN RAE SYSTEMS
INSTRUMENTS
Introduction
The formaldehyde (HCHO) sensor for RAE Systems MultiRAE family and ToxiRAE Pro gas monitors can be used for a wide variety of applications, such as automobile and chemical manufacturing, construction, indoor air quality, medical, and many others.
Specifications
Sensor and Size type
4R+ intelligent sensor (stores calibration information, alarm limits and other
relevant data)
| range: | 0 to 10ppm |
|---|---|
| resolution: | 0.05 ppm |
| response time: | T50 < 80 seconds |
| Storage life: | 6 months in sealed container |
| Warranty: | 1 year from date of shipment |
Supported monitors
| Single-gas: | ToxiRAE Pro (Model PGM-1860) |
|---|---|
| multi-gas: | MultiRAE Pro (PGM-6248) |
MultiRAE (PGM-6228)
MultiRAE Lite Pumped (PGM-6208)
MultiRAE Lite Diffusion (PGM-6208D)
Calibration information
Calibration gas
Carbon Monoxide gas (CO, 50 ppm) or Formaldehyde gas (HCHO, 9 ppm)
Calibration Sequence
If the HCHO sensor is installed in the same multi-gas instrument as sensors
for compounds to which the HCHO sensor has crosssensitivities, the HCHO sensor
should be calibrated first, prior to the other sensors.
Ordering
The HCHO sensor can be ordered with the new ToxiRAE Pro and MultiRAE family of
monitors listed in the “Supported Monitors” section, using the Product
Assemble-to-Order (ATO) Configurator provided in the Portables Pricing Guide,
or as an individual (replacement) sensor.
HCHO [replacement] Sensor ordering information
Part Number: C03-0982-000
CROSS-SENSITIVITY ISSUES AFFECTING INSTRUMET CONFIGURATIONAS INVOLVING HCHO
SENSOR
Due to the HCHO sensor’s high cross-sensitivities and long recovery times
after its exposure to select compounds (especially when the sensor is
installed in multi-gas monitors like the new MultiRAE), some sensor
combinations cannot be supported in one multi-gas instrument. Other sensor
combinations may be feasible, but users should take note of the additional
operation and maintenance requirements and/or limitations prior to use for
specific applications.
| Cross-Interfering Compound | NH₃ (ammonia) | CO ₂(carbon dioxide) | cH4 (methane) |
|---|---|---|---|
| Cross-InterferingCompound Concentration | 50 ppm | 5,000 ppm | 50% LEL |
| HCHO Sensor Cross-Sensitivity Level | None/Minimal | None/Minimal | None/Minimal |
Configurations without cross-Sensitivities
Based on the information provided in the previous table, the HCHO sensor has
virtually no cross-sensitivity to the following gases, so no related issues
should be expected when the HCHO sensor is installed in the same instrument as
the following sensors:
- Ammonia (NH₃)
- Carbon Dioxide (CO₂)
- Methane (CH₄; catalytic bead LEL or NDIR)
Notes:
- Data in the tables within this note are based on the HCHO (formaldehyde) sensor’s cross-sensitivity to a single gas of certain concentration.
- Mixtures of gases were not tested, and results with mixed gases are unpredictable.
- Cross-sensitivities to all the compounds are only valid for a specified concentration and may be different for higher concentrations of the same compound.
- All specifications have been verified under the following environmental conditions: temperature: 68° F (20° C); relative humidity (non-condensing): 50%; ambient pressure: 1atm (1,013 mbar)
ConfigurationS requiring Special attention
The HCHO sensor can be ordered with the sensors listed below, but customers
should be aware of the potential issues related to sensor cross-sensitivities
and slower recovery times.
- Hcn (Hydrogen cyanide) – The HCHO sensor not only has a moderate positive cross-sensitivity to HCN gas, but it can also take up to 20 minutes to recover from exposure to HCN gas.
- H₂S (Hydrogen Sulfide) – The HCHO sensor has a very high positive cross-sensitivity to H2S gas and typical recovery times of up to 10 minutes.
- PH₃ (phosphine) – The HCHO sensor has a very high positive cross-sensitivity to PH3 gas.
- Pid (volatile organic compounds) – HCHO sensor has high cross-sensitivity and long sensor recovery time when exposed to 100 ppm or higher concentrations of Isobutylene.
- 10 ppm Isobutylene calibration gas can be used to calibrate the PID sensor instead of 100 ppm Isobutylene to reduce its effect on the HCHO sensor.
- As illustrated in the table below, the HCHO sensor also has positive cross-sensitivities to the following gases, so caution should be taken when using respective sensors in the same instrument as the HCHO sensor:
- Carbon Monoxide (CO)
- Hydrogen (H₂)
- Nitric Oxide (NO)
- Sulfur Dioxide (SO₂)
Cross-Interfering
Compound| co (carbon
monoxide)| H2 (Hydrogen)| Hcn
(Hydrogen
cyanide)| n2S (Hydrogen
Sulfide)| c4H8 (isobutylene)| no (nitric
oxide)| pH3 (phosphine)| So2 (Sulfur
dioxide)
---|---|---|---|---|---|---|---|---
Cross-Interfering
Compound Concentration| 50 ppm| 200 ppm| 10 ppm| 10
ppm| 100 ppm| 25 ppm| 5 ppm| 5 ppm
HCHO Sensor Cross Sensitivity Level| Moderate positive| Minimal| Moderate
positive| High positive| High positive| Slight
positive| High positive| Moderate
positive
HCHO Sensor Cross Sensitivity Approximate Value| 20%| 1-2%| 25%| 150%+| 100%+|
10%| 100%+| 30%
Problematic configuration
Due to HCHO sensor’s negative cross-sensitivities (a potential safety threat!)
to respective gases specified below, the users should exercise caution when
using the HCHO sensor in the same instrument as the following sensors:
- Chlorine (Cl₂)
- Nitrogen Dioxide (NO₂)
| Cross-Interfering Compound | Cl₂ (chlorine) | NO₂ (nitrogen dioxide) |
|---|---|---|
| Cross-Interfering Compound Concentration | 1 ppm | 5 ppm |
| HCHO Sensor Cross-Sensitivity Level | Moderate negative | Moderate negative |
| HCHO Sensor Cross-Sensitivity Approximate Value | -20% | -20% |
Note: From a safety standpoint, a negative cross-sensitivity may present
a higher risk than a positive one, as it will diminish a sensor’s response to
the target gas and so prevent an alarm.
OTHER CONFIGURATIONS
Customers wishing to order MultiRAE instruments with any other sensor
combination involving the HCHO sensor should contact RAE Systems.
RAE Systems by Honeywell
877-723-2878
raesystems.com
Documents / Resources
| RAE
SYSTEMS C03-0982-000 Formaldehyde HCHO
Sensor
[pdf] User Manual
C03-0982-000, Formaldehyde HCHO Sensor, C03-0982-000 Formaldehyde HCHO Sensor
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