Daviteq Pressure Measurement Technologies
Daviteq ULP Air/Gas Ultra-low Pressure Digital Sensor
1. Overview
Daviteq ULP Sensor is the digital, ultra-low pressure sensor offering state-of-the-art MEMS pressure transducer technology and CMOS mixed signal processing technology to produce a digital, fully conditioned, multi-order pressure and temperature compensated sensor. It is available in a gauge and a differential pressure configuration.
The total error band after autozero is less than 1%FS.
This ULP sensor module will be integrated with a transmitter module to give a suitable output like RS485 ModbusRTU, 4-20mA, 0-10V, Sub-GHz wireless, LoRaWAN, Sigfox, NBIoT...It is also powered by that transmitter.
Typical Applications of this Ultra-low Pressure Sensor:
-
Gas Flow Instrumentation
-
Air Flow Measurement
-
HVAC / VAV
-
Pressure Monitoring
- Negative Pressure Room Monitor
- Positive Pressure Room Monitor
- Filter Clogging Monitor
-
Safety Cabinets
2. Detail measurement principle and its specification
ULP can measure gauge pressure or differential pressure, please refer to below specification.
| Type | Min Pressure (Pa) | Max Pressure (Pa) | Total Error Band * (% FS) |
| ULP-G300 | 0 | +300 | +/- 1.0 |
| ULP-G600 | 0 | +600 | +/- 1.0 |
| ULP-D125 | -125 | +125 | +/- 1.25 |
| ULP-D250 | -250 | +250 | +/- 1.0 |
Common specification
| Operating Temperature | -20 .. + 85 oC |
| Compensation Temperature | -20 .. + 85 oC |
| Max allowable static pressure | 7 Kpa |
| Burst static pressure | 20 Kpa |
| Process connection | 6mm tube quick fittings |
| Electrical Connector | Integral PG9 connector or M12-M connector (for remote version) |
| Housing Material | Engineering Plastic |
| Process connection | 6mm tube quick fittings |
| Working Humidity | 0 .. 100%RH |
| IP Rating | IP67 |
3. Calibration of the Daviteq AFD Air/Gas Flow Sensor
The Daviteq ULP pressure sensor is calibrated at the factory.
The customer is recommended to re-calibrate the sensor every 12 months by the Ultra-low pressure calibrator or by a 3rd-party.
Notes:
* The calibration and configuration can only be done when the ULP module is used with a transmitter like Sub-GHz (WS433-M12F-AFD) or LoRaWAN (WSLRW-M12F-AFD) or Sigfox (WSSFC-M12F-AFD, or ModbusRTU
* After that, use the offline tool or downlink to configure A & B to the device.
4. Application notes for the Daviteq ULP Ultra-low Pressure Sensor
The Daviteq ULP Ultra-low Pressure Sensor together with a transmitter to be used in the following cases:
-
Gas Flow Instrumentation
-
Air Flow Measurement
-
HVAC / VAV
-
Pressure Monitoring
- Negative Pressure Room Monitor
- Positive Pressure Room Monitor
- Filter Clogging Monitor
-
Safety Cabinets
5. Installation
5.1 Mounting Direction
The sensor can be mounted in any direction. After fixing, please perform the zero calibration to get a correct reading.
5.2 Connect tubing
Use the 6mm OD plastic tubes to connect to the H and L pressure ports of the sensor.
5.3 Mounting Position
- The mounting position must be chosen such that access to the Device is always possible;
- Please take note of the specification of the ULP sensor and its transmitter to ensure the complete set of devices is suitable for the process and environment of the installation.
6. Troubleshooting for the ULP Sensor
| No. | Phenomena | Reason | Solutions | |
| 1 | The pressure value is always very small or zero. | 1.1 | The tubes are bending or breaking | Check the tubes and connection |
| 1.2 | The connection between the sensor and transmitter is not firm | Check the electrical connection of the sensor module | ||
| 1.3 | The pressure sensor got a problem or the transmitter got a problem. | Please consult the manufacturer for a warranty or replacement. | ||
| 2 | From system: HW_Error = 1 | 2.1 | The lost connection between the sensor and the transmitter | Check the electrical connection of the sensor module |
| 2.2 | The sensor module got a problem. | Please consult the manufacturer for a warranty or replacement. |
7. Maintenance of the ULP Sensor
- There are no moving parts or consumed parts in the ULP Sensor. Therefore there is no need to do maintenance.
- However, the pressure sensor will drift over time. We do recommend customer to re-calibrate it every 12 months.
8. Default configuration
This ULP Sensor has the default configuration. The user can change the configuration on the transmitter so that the complete device (sensor + transmitter) delivers the proper output values. Below are some configuration parameters stored in the transmitter's flash memory.
| Description | Unit | Default | Format | Property | Comment |
| CONSTANT_A | 1 | Float | R/W |
Constant a for scaling pressure value (in Pa) |
|
| CONSTANT_B | 0 | Float | R/W |
Constant b for scaling pressure value (in Pa) |
|
| HIGH_CUT | 1E+09 | Float | R/W |
High cut value for scaled value |
|
| LOW_CUT | 0 | Float | R/W |
Low cut value for scaled value |
|
| SENSOR_BOOT_TIME | mS | 200 | Uint32 | R/W |
Boot time of sensor/input, in ms |
|
TEMPERATURE_OFFSET_X10 |
oC | 0 | int16 | R/W |
Offset adjustment for measured temperature value |
END.
Instructions for Grounding of Pressure Sensor
| DEC-2022 |
CONNECTING GND FOR SENSOR
Step 1: Open the blue housing of the sensor
Step 2: Locate the GND point on the PCB (same GND point of Battery);
Step 3: Solder a wire to this GND point; the other end of the wire will be screwed to 1 of 2 screws on the aluminum base;
.jpeg)
Step 4: Outside of the aluminum base there is another screw → make a wire connection from this screw to the body of pressure sensor (stainless steel cylindrical body) → Use a hose clamp or stainless steel pipe bracket to lock the connection between the wire and the housing.
Support contacts
Manufacturer
Daviteq Technologies Inc
No.11 Street 2G, Nam Hung Vuong Res., An Lac Ward, Binh Tan Dist., Ho Chi Minh City, Vietnam.
Tel: +84-28-6268.2523/4 (ext.122)
Email: info@daviteq.com | www.daviteq.com