Technical Datasheet: Pressure Transmitter 990M.351114

1. Product Overview

The 990M series is a compact differential pressure transmitter used to measure low pressures of air and non-aggressive gases. It is commonly utilized in building automation for monitoring filters, fans, and overpressure in cleanrooms.

2. Technical Specifications

Feature	Specification
Manufacturer	Beck GmbH (Druckkontrolltechnik)
Model / Type	990M.351114
Measurement Type	Differential Pressure
Pressure Range	$0 \dots 10 \text{ mbar}$
Output Signal (Y)	$0 \dots 10 \text{ V}$ (Analog)
Supply Voltage (G)	$18 \dots 30 \text{ VAC/DC}$
Accuracy (Linearity/Hysteresis)	$\le \pm 1\% \text{ Full Scale (FS)}$
Overload Capacity	Up to $200 \text{ mbar}$
Medium	Air and non-aggressive gases only
Origin	Made in Germany

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3. Physical & Identification Details

• Beck Article No.: 15224-5202

• SIG Article No.: 877790018

• Serial Number: 27839501023

• Manufacturing Date: 1541 (Week 15, 2021 or 2015 depending on manufacturer cycle)

• Pneumatic Connections: Two screw-on metal nipples for pressure hoses.

• Electrical Connection: 3-pole or 4-pole screw terminal block (visible at the top).

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4. Wiring and Installation

Typical Terminal Assignment:

While you should always consult the specific manual for the 990M series, standard wiring for this $0 \dots 10 \text{ V}$ model usually follows:

1. G (Supply): $24 \text{ V AC/DC}$

2. G0 (Ground): Common Reference

3. Y (Output): $0 \dots 10 \text{ V}$ Signal

Installation Notes:

• Mounting Position: Sensitive low-pressure transmitters are often calibrated for a specific orientation (usually vertical). Check if the zero point needs adjustment after mounting.

• Pressure Ports: * P1 (+): Higher pressure (or static pressure).

  • P2 (-): Lower pressure (or vacuum).

• Environment: Ensure the device is used in a clean, dry environment as it is rated for non-aggressive gases.

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5. Applications

• Monitoring air filters and industrial cooling systems.

• Controlling pressure in cleanrooms and laboratories.

• Airflow monitoring in ventilation ducts (using a Pitot tube).

• Fan and blower control.