The CST-MDP low differential pressure transmitter measures very small air pressure differences from ±50 Pa to ±10,000 Pa with 4–20 mA or 0–10 VDC output and optional RS485 Modbus RTU / BACnet MS/TP. It is ideal for cleanroom pressure monitoring, duct static pressure, air filter monitoring and fan control in HVAC systems.
Features include a local zero button, selectable response time, overpressure up to 15× range and a compact 140 g flame-retardant UL94-V0 housing. Equipment Industrial Solution Co., Ltd (ISE) supplies the CST-MDP in all ranges and helps you choose the right range for your application.
Advantages of the CST-MDP differential pressure sensor
- Accurate very-low DP measurement, smallest range 0~±50 Pa – for cleanrooms and positive/negative pressure rooms.
- Selectable outputs: 0–5/10 VDC or 4–20 mA.
- Optional RS485 Modbus RTU or BACnet MS/TP for direct BMS integration.
- One-touch zero calibration with LED confirmation.
- Adjustable response time 0.5 / 1 / 2 / 4 s – damps pressure fluctuations from fans and doors.
- High overpressure tolerance up to 15× rated range.
- Flame-retardant UL94-V0 industrial plastic housing, compact and light (140 g).
- Wide operating temperature, extended version down to −40 °C.
CST-MDP specifications
| Parameter | Value |
|---|---|
| Range | 0~±50 Pa to 0~±10,000 Pa |
| Accuracy | ±1.0 % FS |
| Compensated temperature | −10 ~ 60 °C |
| Thermal drift (zero / span) | ±0.01 % FS/°C |
| Overpressure | 15× range |
| Output | 0–5/10 VDC (3-wire) or 4–20 mA (2-wire); optional RS485 (Modbus RTU / BACnet MS/TP) |
| Power supply | 10–30 VDC (voltage output); 12–30 VDC (4–20 mA) |
| Load | ≥ 50 kΩ (voltage); ≤ 250 Ω (4–20 mA) |
| Response time | 0.5 / 1 / 2 / 4 s (selectable) |
| Operating temperature | −10 ~ 60 °C (standard); −40 ~ 85 °C (extended) |
| Housing | UL94-V0 flame-retardant plastic |
| Pressure connection | Metal hose barbs |
| Cable entry | Ø8 mm cable |
| Weight | 140 g |
| Media | Air and inert, non-corrosive gases |
Wiring, communication and calibration
- Voltage output 0–5/10 VDC: 3-wire per terminal label.
- Current output 4–20 mA: 2-wire, non-polarised – can be wired either way.
- RS485: Modbus RTU (function 0x03 read, 0x06 write) or BACnet MS/TP; register map supplied with the protocol document.
- Field zero: apply equal pressure to (+) and (−) ports, press the zero button, LED confirms.
Applications of low differential pressure transmitters
- Cleanrooms, operating theatres, negative-pressure isolation rooms, pharmaceutical and electronics plants.
- Duct static pressure and supply/exhaust fan VFD control in HVAC.
- Air filter monitoring for AHUs, FCUs and dust collectors.
- Building pressure monitoring and stairwell pressurisation.
- Furnace draft / combustion chamber pressure for boilers and dryers.
- Energy management, building automation (BMS) and medical equipment.
FAQ
Can the CST-MDP measure water or liquids?
No – it is for air and inert gases only. For liquid, steam or DP level measurement see the CST305X-DPT differential pressure transmitter.
What range should I choose for a cleanroom?
Cleanroom pressure differences are typically 5–30 Pa, so a 0~±50 Pa or 0~±100 Pa range gives the best resolution.
What range for AHU filter monitoring?
Filter pressure drop is usually a few hundred Pa; 0–500 Pa or 0–1000 Pa is suitable.
Related products
- 10 differential pressure transmitter applications (EU standards)
- CST305X-DPT differential pressure transmitter
- CST-PT pressure transmitter
Where to buy the CST-MDP low differential pressure transmitter?
EQUIPMENT INDUSTRIAL SOLUTION CO., LTD (ISE) – Ho Chi Minh City, Vietnam – supplies genuine the CST-MDP low differential pressure transmitter with technical consulting, fast quotation and on-site commissioning support across Vietnam and Southeast Asia.
Contact us: Sales +84 909 617 185 – Technical +84 979 117 185 – Email: [email protected]
