Siemens QBE2003-P1 Pressure Sensor

Comanda nr.: S55720-S290

1. Definiția de bază a modelului

QBE2003-P1

QBE: Pressure transmitter series

2003: 3-wire DC 0–10 V voltage output

P: Presiunea manometrică

1 = Measuring range: 0～1 bar (0～0.1 MPa, 0~100kPa)

Similar form factor current output variant: QBE2103-P1 (4~20mA 2-wire) – do not confuse.

2. Specificații electrice de bază
3. Alimentare electrică (identical to QBE2003-P16)

AC 24 V (standard power for BMS DDC controllers)

DC 12～33 V wide-range DC input

Consumul de energie: ＜7 mA

⚠️ Never connect to AC220V

2. Ieșire semnal

DC 0～10 V, 3-sistem de sârmă; Load impedance ＞10 kΩ

3. Hirschmann pin assignment (DIN EN175301-803-A)

Pin1: Putere pozitivă (AC24V / DC+)

Pin2: 0~10V signal output

Pin3: Common GND (masă de putere + signal ground)

3. Pressure Performance Parameters

Domeniul de măsurare: 0～1 bar (0～100kPa) gauge pressure

Precizie: Typical ±0.3 %FS; Maximum ±0.5 %FS

Timp de răspuns: ＜2 ms

Maximum overpressure: 3 × FS = 3 bar

Burst pressure: ＞3 bar

✅ Important distinction: Models P1/P1.6/P4 withstand 3×FS overpressure; high-range versions P6/P10/P16 only support 2.5×FS overpressure.

4. Mecanic & Parametrii de mediu

Pressure connection: G½” external thread with internal M5 thread (for mounting damping screw to suppress pressure spikes)

⚠️ QBE2003-P10/P16/P25 have no internal M5 thread — this is a key hardware difference between P1 and P16.

Diaphragm material: 1.4404 (316L oțel inoxidabil)

Compatible media: Neutru, weakly corrosive liquids/gases (apă, glycol mixtures, aer comprimat, light oil)

Medium temperature: -15 ℃ ~ +125 ℃

Ambient operating temperature: -30 ℃ ~ +85 ℃

Clasa de protectie: IP65

Orientarea montajului: Any position

5. Scenarii tipice de aplicare (Specialized for 0~1bar low pressure range)
6. Static pressure monitoring of atmospheric tanks and expansion vessels
7. Chilled/hot water static pressure & low-pressure supply circuits in HVAC systems
8. Static pressure measurement for fresh air ducts
9. Low-pressure air supply & low-pressure atmospheric gas pipelines
10. Low-pressure return circuit monitoring on plate heat exchanger units
11. QBE2003-P1 VS QBE2003-P16 Comparison

7. Selecţie & On-site Troubleshooting Tips
8. This model has a very narrow measuring range. Not recommended if sustained system working pressure exceeds 0.8 bar, as operating point will approach full scale.
9. For applications with severe pressure pulsation, install damping screw via the M5 internal thread.
10. For DDC 0~10V signal acquisition, senzor GND must share common ground with the controller.
11. Install isolation device if medium contains strong acid, alkali or seawater.
12. Not directly interchangeable with the 4~20mA variant QBE2103-P1.

Domestic Replacement Options for Siemens QBE2003-P1 / QBE2003-P16

Mandatory Replacement Prerequisites (All conditions must be satisfied for direct DDC system swap)

✅ Output: 3-wire DC 0~10V

✅ Electrical connector: DIN43650A Hirschmann plug

✅ Pressure thread: G½” external thread

✅ Power supply: Compatible with AC24V / DC12~33V (critical for BMS! Most standard domestic transmitters only support DC24V. Specify AC24V compatibility when placing orders.)

✅ Diaphragm: 316L oțel inoxidabil, medium temperature resistance ≥100℃ (suitable for hot water/glycol HVAC systems)

✅ Range selection:

Replacement for QBE2003-P1: 0～1 bar (0～0.1MPa) gauge pressure

Replacement for QBE2003-P16: 0～16 bar (0～1,6MPa) gauge pressure

1. Mainstream Domestic Models (Preferred for HVAC & Automatizarea clădirilor)
2. PCM300 (Universal industry model, widely stocked, cost-effective first choice)

Complete ordering specification example:

PCM300-G1/2-0~1bar-0~10V-Hirschmann-AC/DC24V

PCM300-G1/2-0~1.6MPa-0~10V-Hirschmann-AC/DC24V

Precizie: ±0,5% FS; ±0.25%FS optional

Medium temperature: -20～125℃; 316L isolation diaphragm

⚠️ Mandatory order remarks: 3-wire 0~10V, AC24V compatible power supply, G1/2 external thread

2. Hongrun OHR-M2 (Widely used in BMS projects, performanță de încredere)

Model code: OHR-M2-G12-XXX-0~10V

Hirschmann connector & G½ thread available; AC24V customizable

Strong anti-interference against power frequency noise, ideal for installation near pump rooms with variable frequency drives

Clasa de precizie 0.5, low long-term drift

3. LEEF LFT2010 (Major automation component supplier, consistent batch quality)

Model complet: LFT2010-G1/2-0~1bar(0~1.6MPa)-0~10V-DIN connector

Native wide voltage support, AC24V rectifier circuit available on request

Housing dimension highly consistent with Siemens QBE2003, no modification required for mounting space

4. Shangrun SIN-P300

SIN-P300-G1/2-0~0.1MPa / 0~1.6MPa, 0~10V 3-wire, Hirschmann connector

Established domestic instrumentation manufacturer, suitable for bulk project procurement

5. Changhui SWP-ST61 (High-precision alternative)

Customizable: 0~10V output, AC24V supply, G1/2 thread; ±0.25%FS accuracy optional, matching Siemens ±0.3%FS accuracy class

1. Low-Cost Generic Compact Models (For breakdown maintenance & spare parts)

General compact diffusion silicon pressure transmitter form factor:

Verbal specification template to forward to suppliers:

Compact pressure transmitter, DIN Hirschmann connector, G1/2 external thread, gauge pressure 0~1bar (or 0~1.6MPa), 3-wire 0~10V output, power supply AC24V/DC12~33V, 316diafragma L, max medium temperature 120℃, IP65

III. Critical Replacement Risks & Preventive Guidelines

1. Power Supply Pitfall

Standard domestic versions only support DC24V DC, cannot operate directly with AC24V power from DDC cabinets.

Without pre-customized AC rectification circuit, abnormal operation will occur after power-up!

Original Siemens unit has built-in rectifier and supports AC24V inherently.

2. Thread Specification Check

Default thread for many domestic transmitters is M20×1.5. Explicitly specify G½” (G1/2) external thread, otherwise pipe threads will not match.

3. Special Note for P1 Model Replacement

Siemens QBE2003-P1 base is equipped with M5 internal damping thread; most generic domestic transmitters omit this feature.

If severe pressure fluctuation or water hammer exists on site, an external pressure damper must be installed separately.

4. Pin Assignment Matching

Request domestic transmitter pin definition consistent with original unit:

Pin1=Power positive, Pin2=Signal output, Pin3=Common GND.

Mismatched pinout causes reversed signal or zero output.

5. Temperature Limitations

Standard domestic transmitters usually limit medium temperature to 80℃.

Specify high-temperature variant (max 125℃) for hot water circuits (>90℃) in HVAC systems.

1. Model Selection Priority Recommendation
2. Large-scale commercial projects, long-term continuous use: LFT2010 / OHR-M2 (performanță stabilă & reliable supply)
3. Reparație de urgență, spare stock, cost control: PCM300 (largest spot inventory)
4. High-precision requirement, precise monitoring for heat exchange stations: SWP-ST61 (0.25 clasă)