CẢM BIẾN ÁP SUẤT WIKA MH-4

Applications
* Working pressure measurement
* Control pressure measurement
Special features
* Developed for the extreme operating conditions in mobile working machines
* Reliability and highest accuracy over the entire life cycle
* Customer-specific adaptations and individualisation
* High production capacities

Overload safety

      ≤ 400 bar [≤ 5,000 psi]: 3 times

      600 bar [8,000 psi, 10,000 psi]: 2 times

      1,000 bar: 1.5 times

The overload safety is based on the measuring range. Depending on the selected process connection and sealing, restrictions in overload safety can result.

Vacuum tightness: Yes

Signal type Signal

Current (2-wire): 4 ... 20 mA

Voltage (3-wire):

      DC 1 ... 10 V

      DC 1 ... 5 V

      DC 0.5 ... 4.5 V

Ratiometric (3-wire): DC 0.5 ... 4.5 V

Pulsewidth modulation PWM (3-wire)

      10 ... 90 % pulse-duty factor

      High level: DC 3 ... 12 V (selectable in 1 V steps)

      Output frequency: 0.25 ... 2 kHz (selectable in 0.25 kHz steps)

      Other output signals on request

Signal clamping (option): The range of the output signal can be limited. For this purpose, a lower and an upper signal threshold are defined in the sensor electronics. If the output signal reaches these threshold values, the sensor outputs a defined, constant signal value. Therefore, in operation, unwanted pressure or signal ranges are filtered out.

Diagnostic function (option): Permanent errors in the sensor electronics and temporary system overpressures can be output through defined constant output signals. A permanent error signal signifies a sensor defect and cannot be reset. The temporary error signal is reset as soon as the system pressure once again lies under the error threshold. In the application, one can therefore realise an efficient system diagnosis.

Load:

      Current (2-wire): ≤ (power supply - 7.8 V) / 0.022 A

      Voltage (3-wire): ≥ max. output voltage / 1 mA

      Ratiometric (3-wire): ≥ 4.5 kΩ

      Pulsewidth modulation (3-wire): ≥ 10 kΩ

Voltage supply

Power supply: Max. power supply with UL approval: DC 35 V

Current output (2-wire): 4 ... 20 mA: DC 8 ... 36 V

Voltage output (3-wire):

      DC 1 ... 10 V: DC 12 ... 36 V

      DC 1 ... 5 V: DC 8 ... 36 V

      DC 0.5 ... 4.5 V: DC 8 ... 36 V

Ratiometric output (3-wire): DC 0.5 ... 4.5 V: DC 5 V ± 10 %

Pulsewidth modulation PWM (3-wire): 10 ... 90 % pulse-duty factor: (high level + DC 1 V) (min. DC 8 V) ... 36 V

Total current consumption:

      Current output (2-wire): ≤ 25 mA

      Voltage output (3-wire): ≤ 10 mA

      Ratiometric output (3-wire): ≤ 10 mA

      Pulsewidth modulation (3-wire): ≤ 10 mA

Time response

Settling time per IEC 62594: 1 ms

Signal damping (option): 2 / 4 / 9 / 18 / 37 / 75 / 150 ms

Switch-on time: 200 ms

Reference conditions (per IEC 61298-1)

Temperature: 15 ... 25 °C [59 ... 77 °F]

Atmospheric pressure: 860 ... 1,060 mbar [12.5 ... 15.4 psi]

Air humidity: 45 ... 75 % r. h.

Power supply: DC 24 V (DC 5 V with ratiometric output)

Mounting position: Calibrated in vertical mounting position with process connection facing downwards.

Accuracy specifications:

      Non-linearity (per IEC 61298-2)

      ≤ ±0.25 % of span (BFSL)

Long-term drift (per IEC 61298-2): ≤ ±0.1 % of span

Total error band: Including non-linearity, hysteresis, non-repeatability, zero point and full scale deviation, temperature error, temperature hysteresis and error through atmospheric air pressure fluctuations.

Operating conditions

Ingress protection (per IEC 60529 and ISO 20653): see electrical connections

Permissible temperature ranges

      Ambient: -40 ... +125 °C [-40 ... +257 °F]

      Medium: -40 ... +125 °C [-40 ... +257 °F]

      Storage: -40 ... +70 °C [-40 ... +158 °F]

Depending on the choice of sealing on the process connection, the electrical connection and UL approval, there may be limitations in the medium and ambient temperatures (for restrictions see “Process connections, sealings” and “Electrical connections”).

Vibration resistance (per IEC 60068-2-6): 40 g, 10 .... 2,000 Hz

Continuous vibration resistance (per IEC 60068-2-6): 10 g, 10 ... 2,000 Hz

Shock resistance (per IEC 60068-2-27): 100 g, 11 ms

EMC field:

      Current output (2-wire): 100 V/m (per ISO 11452-2)

      Voltage output (3-wire): 100 V/m (per ISO 11452-2)

      Ratiometric output (3-wire): 100 V/m (per ISO 11452-2)

      Pulsewidth modulation (3-wire): 30 V/m (per IEC 61326-2-3)

Service life: 100 million load cycles

Free-fall test (following IEC 60721-3-2):

      Individual packaging: 1 m [3.28 ft]

      Multiple packaging: 0.5 m [1.64 ft]

Materials

Wetted parts: 304L, PH grade steel

Non-wetted parts: 304L, electrical connection made of highly resistant glass-fibre reinforced plastic (PBT)