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ASTNN Series

Thermal Dispersion Probe Airflow Measuring System ASTNN Series

Thermal Dispersion Probe Airflow Measuring System

 

The Johnson Controls AD-1252 Series thermal dispersion probe airflow measuring system averages velocity and temperature from up to four probes and sixteen sensing points in a duct or plenum, providing accurate, dependable airflow measurement from 40 to 40,000 feet per minute (FPM) (12 to 1,219 meters per minute [MPM]) within ± 2% accuracy. The factory assembled AD-1252 thermal dispersion probe airflow measuring system incorporates up to four thermal dispersion probes, a shielded CAT5e communications cable, and a DMPR-RA002 electronic controller.


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Features
  • Airfoil-shaped aluminum probes
  • Digital controller display
  • Multiple microprocessor-based circuits
  • LCD screen
  • Wind gust filter
  • Plenum rated
  • 4-20 mA or 2-10VDC
Specifications

Supply Voltage: Dedicated 24 VAC transformer

 :4 Probes with 4 Sensors 65 VA

 :3 probes with 4 sensors 48 VA

 :2 probes with 4 sensors 35 VA

 :1 probe with 4 sensors 17 VA

Signal Output: 4-20 mA standard; 2-10 VDC requires 499 ohm resistor across output terminals

Output Signal Adjustments:Field adjustable offset/gain

Probe: Airfoil shaped 2″ x 3/4″, 6063T5 aluminum

Maximum Number of Sensors:2 to 16 (size dependent)

Pressure Drop: Four 48 ″ (122 cm) long probes in 48″ x 48″ (122 x 122 cm) duct: 0.1″ w.g.

Thermistor: Bead-in glass type

Size Range: 8″ x 8″ to 120″ x 120″

Standard Insertion Brackets:

 :Multiplexer Side 0.080″ (2.0 mm) aluminum

 :Non-Multiplexer side 22 gauge galvanized steel

Installed Airflow Accuracy:± 2% of reading

Repeatability: ± 0.25%

Measurement Units: Inch-pound (I.P.) or International System (S.I.)

Sensor Distribution: Equal area

Calibrated Range: 40 to 4,000 FPM (12 to 1,219 MPM)

Velocity Requirements:

 :Minimum 40 FPM (12 MPM)

 :Maximum 4,000 FM (1,219 MPM)

Temperature Sensing Accuracy:± 10℉

Display: 16 x 2 character LCD (airflow, temperature, and diagnostics)

Operating Temperature : -25° to 140℉ (-32° to 60℃)

Operating Humidity: 0 to 99% RH, noncondensing

Enclosure Rating: NEMA 1, 0.080″ (0.2 cm) aluminum

Weight:

 :Controller 2.9 lb (1.32 Kg)

 :Sensor 1.0 lb (0.45 Kg)

Warranty: 1 year

Certifications