Digital differential pressure transmitter | controller | -100-100Pa | -1000-1000Pa | -10000-10000Pa | 16-30VDC | IP65

General Technical Specifications:

Measurement medium: air or neutral gases

Measurement range: ±100 Pa, ±1000 Pa, ±10000 Pa

Overload pressure: 5 kPa (ESLFM326); 10 kPa (ESLFM320); 80 kPa (ESLFM322)

Accuracy: ±1% F.S

Operating temperature: -10°C ~ +60°C

Temperature compensation: -10°C ~ +60°C

Storage temperature: -20°C ~ +70°C

Pressure connection: plastic, Ø6.5 mm (inlet type)

Signal output: 4–20 mA and 0–10 V | RS485

Control relay: 2 SPDT relays, 3A @ 250VAC / 30VDC

Protection class: IP65

Power supply: 16–30 VDC

Power consumption: ≤ 2.5W

Display: LCD, 76 x 33 mm

Enclosure: UL94-V0/ABS (impact and heat-resistant plastic)

Certificates: RoHS, EU, CE

Electromagnetic immunity: EN 61326-1

Communication: RS-485 standard interface, Modbus RTU protocol

Weight: 360 g

Selectable parameters by order code:
Order code: ESLFM33- 0(A) A(B) R(C) P(D) B(E)

A – Measurement range:
6: -100 ~ +100 Pa
0: -1000 ~ +1000 Pa
2: -10000 ~ +10000 Pa

B – Signal output:
N: None
E: RS-485 (Modbus RTU)
A: 4–20 mA + 0–10 V (analog signal)

C – Control relays / buzzer:
N: None
R: 2 SPDT relays + 1 buzzer
B: Buzzer only
D: 2 SPDT relays (without buzzer)

D – Mounting panel:
P: Plastic, round panel
S: Stainless steel, square panel

E – Air intake direction:
F: Front intake
B: Rear intake
S: Side intake

Features and advantages:

High-precision MEMS sensor: accurately detects even small pressure changes – ideal for sensitive systems.

Multifunctional controller: one device includes digital LCD display, analog output, control relays, and buzzer – all you need for automated control.

Modular design – customizable: choose measurement range, signal type, relay configuration, panel type, and air intake direction.

RS-485 Modbus RTU: easy integration into SCADA, BMS, or other automation systems.

Audible and visual alarm: built-in buzzer and light indicator with adjustable alarm thresholds.

Applications:

HVAC systems – differential pressure monitoring in ducts, filter clogging control

Laboratories – pressure balance between zones

Industrial production lines – pneumatic line pressure management

Indoor air quality control – protection from airflow imbalance

Gas supply systems – filter and pipeline pressure difference analysis

Pros:

Accurate and stable measurements even under challenging conditions

Customizable configuration for system-specific needs

Compact IP65 housing – resistant to dust and moisture

RS-485 Modbus RTU support for easy network integration

Audible and visual alarm

Clear digital display of parameters

Cons:

Suitable only for air or neutral gases – not for aggressive chemical media

Requires 16–30 VDC power supply – not suitable without a dedicated DC source

Advanced differential pressure control tailored to your system. Order with your preferred specifications.