Information
Microbridge Airflow Sensors
Gas Media Compatibility – Note #4
132
Honeywell1 Sensing and Control11-800-537-6945 USA1F1-815-235-6847 International11-800-737-3360 Canada
REFERENCE AND APPLICATION DATA
The microbridge mass airflow sensor in-
corporates a limited number of wetted
materials in the construction of the de-
vice. The wetted materials in the sensor
are fairly non-reactive and are compatible
with a wide variety of gaseous media.
Table 1 and Table 2 list wetted sensor
materials and associated media compat-
ibility.
NOTICE
Filtering is highly recommended for use
in applications that may contain dust
particle contamination that can degrade
sensor performance over time. See Par-
ticle Contamination and Filter Manufac-
turers, page 126, for more information.
CAUTION
PRODUCT DAMAGE
AWM Series microbridge mass airflow
sensors are NOT designed to sense liq-
uid flow and will be damaged by liquid
flow through the sensor.
MICROBRIDGE—WETTED SENSOR MATERIALS
Sensor material AWM1000 AWM2000 AWM3000 AWM40000 AWM5000
Silicon XXXXX
Silicon nitride XXXXX
Gold XXXXX
Aluminum oxide XXXXX
Epoxy sealant XXXXX
Fluorocarbon XX
Polyester X
Polyetherimide XXX6 SLPM Only
316 Stainless steel AWM1200V AWM2200V AWM3200V
MICROBRIDGE—GAS MEDIA COMPATIBILITY
Gas Media AWM1000 AWM2000 AWM3000 AWM40000 AWM5000
Air XXXXX
Nitrogen XXXXX
Oxygen XXXXX
Argon XXXXX
Helium 15 VDC Supply 15 VDC Supply 15 VDC Supply 15 VDC Supply 15 VDC Supply
Hydrogen* Special listing Special listing Special listing Special listing Special listing
Natural Gas XXXXX
Nitrous oxide XXXXX
Anesthetic Gasses N/A N/A N/A N/A (Except 6 SLPM) X
Carbon dioxide XXXXX
Nitric oxide Dry Gas Only Dry Gas Only Dry Gas Only Dry Gas Only Dry Gas Only
Sulfur oxide Dry Gas Only Dry Gas Only Dry Gas Only Dry Gas Only Dry Gas Only
Water vapor Non-Condensing Non-Condensing Non-Condensing Non-Condensing Non-Condensing
Ammonia gas Dry Gas Only, <1% Dry Gas Only, <1% Dry Gas Only, <1% Dry Gas Only, <1% Dry Gas Only, <1%
Chlorine gas <0.1% <0.1% <0.1% <0.1% <0.1%
Hydrogen sulfide <0.1% <0.1% <0.1% <0.1% <0.1%
*Note: Applications involving hydrogen gas sensing require the use of a sensor identified by the letter ‘‘H’’ in the catalog order guide. Current
hydrogen stable catalog listings are: AWM2100VH, AWM2300VH, and AWM42150VH. Other listings may be established as hydrogen stable devices.
Please contact the Application Center for assistance at 1-800-537-6945.