AirLine™ AL40 Inline Thermal Mass Flow Meter


Series AL40 AirLine ™ flow meters offer a lower cost option for many air flow applications with the high value associated with all of EPI’s flow measurement instrumentation.




Series AL40 AirLine Flow meters

Low Cost / High Value

Eldridge Products, Inc. (EPI) AirLine Series AL40 Inline is the all new series of thermal mass flow meters designed to aid in the measurement and management of compressed air systems’ consumption and usage.  Low cost and offered in sizes from ¼” NPT to 2” NPT with extremely fast response time.  Get yours today and rest assured with the accurate and reliable capability of the AirLine Series thermal mass flow meter from Eldridge Products, Inc.

The AirLine Series AL40 Flow Meters are compact In-Line style instruments.  The CNC machined and anodized 6061-T6 aluminum flow section is specified to match the user’s flow conduit and is then plumbed directly into the process line. The Series AL40 features a thermal glass coated ceramic sensor for the ultimate in fast response time.  The sensing elements are mounted directly in the flow section for exposure to the process gas.  All electronics are mounted integrally on the flow section in an aluminum NEMA 4X (IP66) enclosure.


Transmitter Operating Temperature: 0° – 150°F ( -18 ° –  65°C)

Temperature Standard: 0°−150°F(−18° –  65°C)

Pressure Rating Maximum :150 PSIG

Communication: RS-232C, RS485 Modbus RTU

Display: Optional 2-Line, 16 character per line, backlit LCD

Wetted Materials:  6061 -T6 Aluminum / Ceramic / Epoxy

Standard Temperature & Pressure (STP): 70°F & 29.92” Hg (Air 0.075 lb./cubic foot )

Calibration: Correlation

Enclosure Rating: NEMA 4X (IP66)

Flow Range Accuracy: ± 3% Full Scale (Not Certified)

Linear Signal Output: 0 – 5 or 0 – 10 VDC, 4 – 20 mA, RS485 Modbus RTU
1 kHz (Proportional to full scale flow rate)

Input Power Requirements: 5 Watts

Power Supply: 24VDC out optional 115 VAC 50/60 Hz 100mA Wall Wart

Relay Output: 1 Amp @ 30 VDC

NOTE: Specifications subject to change without notice.


Product Details

Below is the standard 2″ configuration.We offer sizes from 1/4″ NPT to 2″ NPT. Any questions please consult factory.