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UNIK 5000 Pressure Sensor

Engineer holds UNIK 5000 pressure sensor

NEW: ATEX and IECEx Flameproof certifications  as well as marine certification are now available.

The UNIK5000 pressure sensing platform combines proven silicon technology and analogue circuitry with modular design and lean manufacturing techniques to create a pressure measurement, product range available at short lead times.

We custom-build pressure sensors from standard components, matching accuracy and specification to meet your needs.

Typical applications are in the oil & gas, automotive, aerospace, power-generating sectors and marine, as well as in test equipment, pneumatics/hydraulics and the process industries. With the introduction of the new flame-proof version and the marine certified version, to join the safe area and intrinsically safe version the platform can now offer accurate, reliable and high integrity solutions for an even wider range of pressure sensing applications allowing you greater choice when faced with the rigorous requirements of operations in hazardous zones.


 

 

 

 

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UNIK 5000 Q & A

Quality - Maintaining the best

Field-proven Druck silicon technology is at the heart of the new platform, resulting in a range of high quality piezo-resistive pressure sensors, which are both robust and stable. High levels of performance have been achieved without the use of digital electronics, so that the sensors are particularly well suited to sensitive applications, such as those requiring low power, low noise pulse power and fast response

  • Stainless steel module
  • Analogue electronics giving
    • Fast turn on
    • Pulse power
    • 5kHz frequency response
    • Low noise
  • Accuracy to 0.04%
  • Stability typically 0.05%
  • Intrinsically Safe certifications

UNIK 5000 Pressure Sensor

Flexibility - Better by design

The modular concept of our UNIK 5000 pressure sensor platform allows us to custom-build pressure sensors from standard components, matching accuracy and specification to meet individual requirements. We can create 1000’s of individual sensors, let us provide one just for you by making your selection of:

  • Pressure Connector
  • Pressure Range
  • Electrical Output
  • Electrical Connector
  • Temperature Range
  • Accuracy
  • Instrinsically Safe Certification
  • AccuracyIntrinsically Safe Certification
  • Use our product configurator to check the product you want is available.

Availability - Better by design

We can offer extremely fast delivery of these innovative pressure sensing solutions;  be prepared for 2 weeks delivery as standard for all versions! — 100,000+ variations manufactured from less than 300 stocked component parts.

  • Custom-built from standard components, manufacturing to your requirement is fast and simple

This section will answer all your questions regarding Hazardous Certification, Performance, Physical and Electrical; To read questions and answers, choose a section below. If you can not find the answer in one of the below sections, please contact your local sales office.

 

Hazardous Certification

Can I use the UNIK5000 in a Hazardous area?
Full details of the products certification are detailed in the “Installation Instructions” available from the download section of this page.

The UNIK5000 is available with Instrinsically safe certification from IECEx and ATEX for use in three different application types.  For full details of the correct certification for your area please consult your local certification body.

General Applications IECEx/ATEX Intrinsically Safe ‘ía’ Group IIC—This is the most familiar IS certification for Pressure sensors designation can be given as Ex ia IIC T5 Ga (-40°C =Ta=80°C

Mining applications IECEx/ATEX Intrinsically Safe ‘ía’ Group I—This is appropriate to many hazardous areas in the mining industry. Designation can be given as Ex ia I Ma (-40°C =Ta=80°C

Dust Applications IECEx/ATEX Protected by Enclosure ‘ta’ Group IIIC —This is appropriate in environments when the danger comes from flamable dusts.  Designation can be given as Ex ta IIIC T111°C Da IP64 (-40°C =Ta=80°C

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Can I build the UNIK5000 into my Hazardous area approved equipment?
Full details of the products certification are detailed in the “Installation Instructions” available from the download tab.

The UNIK5000 with no electrical connector has component certification enabling it to be built into custom or OEM equipment as long as the IP rating of the enclosure is certified to the appropriate level for the application.

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Performance

How fast will the UNIK5000 respond to a change in pressure?

  • Frequency response
    • The response of the sensor is in three parts.
  • Transmission of pressure from the media to the sensors diaphragm:
    • At a pressure around 1 bar changing from a standard G1/4 male pressure connection to an open face increased the frequency response from 500 Hz to 1 kHz. Particularly at low pneumatic pressures a clear path for the media to move in to and out of the sensor is by far the most important effect on response time of any pressure sensor.
  • The response time of the silicon to a change in pressure:
    • This changes with pressure getting faster as the pressure increases from about 1 kHz at 1 bar to 50 kHz at 60 bar
  • The response time of the electronics to a change in input:
    • The UNIK5000 electronics will give a 5kHz response to a change of input except when the amplification is turned up when frequency response will drop to 2 kHz this will happen with the 10 volt output circuit and pressure ranges below 350 mbar.
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How does the UNIK5000 compensate for variations in temperature?

Thermal compensation

The 5000-series uses LDR compensation. The basic principle of this compensation method is that the TCR (temperature coefficient of resistance) cancels out the TCS (temperature coefficient of sensitivity). Since these are both properties of the silicon, temperature compensation will be as effective and fast as diode compensation. Without the active components required for diode compensation, the power consumption of the product will be less.

The only exception to this is at very cold temperatures (below about -20 °C) when the low-temperature thermistor starts to have more effect. Since this thermistor is on the PCB, behind the module the temperature compensation below -20 °C will not be as quick to respond.

This is the same compensation method as used in the Druck 317-series.

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How stable will theUNIK5000 be over time?

Druck silicon technology is renowned for its long term stable behaviour. Most of the effects of time on the output of the UNIK5000 will be due to stresses built into the metalwork of the pressure module (mainly due to welding processes) slowly creeping out of the metal. The largest part of these effects will be removed from the metal work soon after manufacture and so the stability of the units will get better over time.

The 5000 uses very similar components to our existing pressure sensors so we have no reason to believe that stability will be very different from existing sensors. Testing for long-term stability started in September 2009 and will continue for at least 1 year.

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What pressure ranges can be specified?

Compound and Offset Ranges

Every UNIK5000 is built from module so the requirement of a compound or non zero range simply results in the select on test resistor software choosing different values, and has no impact on price or delivery.

What is possible can be checked by using the UNIK5000 product configurator. The rules are also written into the order loading and quotation system to ensure we do not load an order or offer a quotation for a selection that cannot be manufactured.

The selection of a compound or offset zero pressure range does not affect the output. For example if option 4 (0 to 5 Volt 3 wire) is selected the output will be 0 to 5 volts regardless of whether the pressure range is 0 to 5 bar or –1 to 5 bar.

If a different output voltage is required then output 8 offers great flexibility.

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Can I specify ranges that do not start at 0 pressure?

Compound and Offset Ranges

Every UNIK5000 is built from module so the requirement of a compound or non zero range simply results in the select on test resistor software choosing different values, and has no impact on price or delivery.

What is possible can be checked by using the UNIK5000 product configurator. The rules are also written into the order loading and quotation system to ensure we do not load an order or offer a quotation for a selection that cannot be manufactured.

The selection of a compound or offset zero pressure range does not affect the output. For example if option 4 (0 to 5 Volt 3 wire) is selected the output will be 0 to 5 volts regardless of whether the pressure range is 0 to 5 bar or –1 to 5 bar.

If a different output voltage is required then output 8 offers great flexibility.

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Does the pressure range selected affect the output signal?

Compound and Offset Ranges

Every UNIK5000 is built from module so the requirement of a compound or non zero range simply results in the select on test resistor software choosing different values, and has no impact on price or delivery.

What is possible can be checked by using the UNIK5000 product configurator. The rules are also written into the order loading and quotation system to ensure we do not load an order or offer a quotation for a selection that cannot be manufactured.

The selection of a compound or offset zero pressure range does not affect the output. For example if option 4 (0 to 5 Volt 3 wire) is selected the output will be 0 to 5 volts regardless of whether the pressure range is 0 to 5 bar or –1 to 5 bar.

If a different output voltage is required then output 8 offers great flexibility.

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How long can I expect a unit to last?

MTBF (Mean time Between Failure)

MTBF has been calculated to be approximately 500,000 hours (over 50 years) at room temperature for the worst case, most complex product (PMP50#8). Other simpler products will have a longer MTBF.

More detail on how this value was calculated and the effect of temperature on this MTBF figure can be found in the engineering document ML0046.

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What is the products MTBF?

MTBF (Mean time Between Failure)

MTBF has been calculated to be approximately 500,000 hours (over 50 years) at room temperature for the worst case, most complex product (PMP50#8). Other simpler products will have a longer MTBF.

More detail on how this value was calculated and the effect of temperature on this MTBF figure can be found in the engineering document ML0046.

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What output voltage can I choose?

  • Configurable output (option 8)
  • The Isolated configurable output (option 8) offers a fully flexible output choice.
  • The 4 pieces of information required are:
    • The low pressure
    • The output voltage at this low pressure
    • The high pressure
    • The output voltage at this high pressure
  • There are 2 constrains:
    • The voltage outputs must be between –10 volts and + 10 volts
    • There must be at least 2 volts between the output voltages

You can check a selection is possible using the Product Configurator.

The Isolated configurable output (option 8) also offers full isolation between the power supply and the outputs so either (but not both) of the outputs can if required be connected to either of the power supply lines as a reference.

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How quiet is a UNIK5000 sensor?

Measuring the loop current to 4 decimal places, e.g. 12.1234 mA, the third decimal place doesn't change. So noise measured in this way could be considered to be better than ±0.0005 in 16 mA, i.e. ±0.003% FS. Note that this measurement was taken  on a DPI620 (AMC) rather than, say, an oscilloscope, which would give a different result due to its wider frequency response.  For a 1000 mbar sensor, this is about 3 Pascals.

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Physical

What is the arrangement for venting to gauge pressure with the different electrical connectors?

Cable Grades

Polyurethane
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere.

Polyurethane Depth
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere. Note the 5000 series body tube is limited to external pressures equivalent to 200 mH2O water.

Hytrel 6108 Depth
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere. Note the 5000 series body tube is limited to external pressures equivalent to 200 mH2O water.

Raychem
On gauge referenced units venting is through a PTFE plug which is not suitable for submersion.  The cable to body tube seal is made with a heat shrink boot which is also not suitable for submersion

Connector Grades

MIL-C-26482
The connectors are sold as IP68.  However in order to vent the gauge reference sensors a PTFE plug is used which reduces this IP rating.

DIN 43650
IP ratings depend on proper installation and correct fitting of the cable in the cable gland.  Gauge units rely on venting through the connector. Tight fitting of all the parts in the connector can seal the sensor so the use of vented cable is recommended.

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How does the venting for Gauge pressure affect the Ingress Protection (IP) rating?

Cable Grades

Polyurethane
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere.

Polyurethane Depth
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere. Note the 5000 series body tube is limited to external pressures equivalent to 200 mH2O water.

Hytrel 6108 Depth
On gauge referenced units venting is through the cable so the end of the cable needs to be both dry and equal pressure with the atmosphere. Note the 5000 series body tube is limited to external pressures equivalent to 200 mH2O water.

Raychem
On gauge referenced units venting is through a PTFE plug which is not suitable for submersion.  The cable to body tube seal is made with a heat shrink boot which is also not suitable for submersion.

Connector Grades

MIL-C-26482
The connectors are sold as IP68. However in order to vent the gauge reference sensors a PTFE plug is used which reduces this IP rating.

DIN 43650
IP ratings depend on proper installation and correct fitting of the cable in the cable gland. Gauge units rely on venting through the connector. Tight fitting of all the parts in the connector can seal the sensor so the use of vented cable is recommended.

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Does the products electrical installation affect its high temperature performance?

Operation at High temperature

In order to test the robustness of the UNIK5000 to high temperature operation, 4-20 mA versions of the unit were run with a 32 volt power supply (2 volts over the maximum supply voltage) for 350 hours (2 weeks) at 128 °C (above the maximum ambient temperature). The 4-20 mA circuit has an additional transistor to most circuits so generates more heat particularly when the supply voltage is high.

All units performed within specification and showed no signs of degradation.

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What are the wetted parts for the different versions?

Diaphragm Material

Hastelloy C276 is used on all units except pressure ranges below 700 mbar where the material changes to Stainless Steel 316L.

The negative port of the wet/dry differential units is a narrow tube onto the back of the sensing module. Gases entering this tube will encounter 316L stainless steel, pyrex, silicone and structural adhesives. If there is doubt as to the compatibility of the media with these materials we would recommend the use of the wet/wet differential.

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How robust is the sensor to vibration and shock?

The following testing was carried out and passed:

  • Vibration
  • Test Specification
  • 30g peak 10 to 2000 Hz, limited by 12 mm double amplitude.
  • Sweep rate of 1 octave per minute.
  • 10 Sweep Cycles (~2hr 15min) in each of three mutually  perpendicular axes.
  • Pass criteria
  • Vibration to this level will not affect calibrated accuracy - post test
  • A response of less than 0.05 %FS/g - during test
  • Shock
  • Test Specification
  • 1000g 1 ms half-sine pulse.
  • Three shocks in each of three mutually perpendicular axes and in both directions.
  • Pass criteria
  • Shock to this level will not affect calibrated accuracy - post test.

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What is the thermal performance of the UNIK5000 outside of its compensated temperature range?

Compensation components are selected to get the best performance over the compensated temperature range.  A thermal calibration (option CC) will measure the units performance over the compensated temperature range.

Thermal shifts are not linear so if a unit is compensated over the range -20 to 80-deg C its performance at -40-deg C may give a relatively large error for a 20-deg C temperature change.

This means that choosing the correct compensated temperature range is critical in order to get the best possible performance from the UNIK5000.

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Electrical

What is the current consumption of the different versions?

The following current consumption figures apply to the appropriate outputs:

  • mV Passive PDCR:  <2mA at 10 Volts (output option 0)
  • mV Linearised PDCR: <3mA (output option 1)
  • PTX 4-20 mA (output option 2)
  • PMP Standard <3mA (output option 3,4,5,6,7)
  • PMP configurable <20 mA at 7 VDC decreasing to <5mA at 32 - V there is a large current consumption up to 30 mA for less than 1 second on switch on. (output option 8)

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What is the difference between the 3 and 4 wire versions?

4 wire operation

  • Output options 3 and 6
  • 0 to 5 volts,
  • 0 to 10 volts
  • The negative output is nominally 1 volt above the negative supply and they cannot be connected.

3 wire operation

  • Output options 4, 5 and 7  0 to 5 volts, 1 to 6 volts, 0.5 to 4.5 volt ratiometric With option 4 (0 to 5 volts) the output will not go to a true 0 voltage output the output saturates at a little less than 50 mV.  For most applications this loss of tracking of output right near the negative pressure value is not important as the pressure does not in practice go to this point With option 5 and 7 effectively the output negative line is connected internally to a fixed reference point and the  output signal is based on this value.

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With the mV (PDCR) units what is the common mode voltage?

Common Mode Voltage

  • mV Passive and Linearized
  • Common Mode voltage
  • 50% of supply voltage

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Which potentiometer is to set Zero and which is to set span?

To adjust the span and zero settings for the pressure transducer:

  • Remove the electrical connector to access the zero and span potentiometers
  • Connect the power supply to the transducer and allow the transducer to get to a stable temperature.
  • Connect the pressure source and set to the necessary low pressure value.
  • Adjust the zero potentiometer to required output at low pressure value.
  • Set the pressure source to the necessary high pressure value
  • Adjust the span potentiometer to required output at high pressure value
  • Release the pressure
  • Disconnect the pressure source and power supply
  • Refit the electrical connector

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How do I complete a zero and span check calibration on a unit?

To adjust the span and zero settings for the pressure transducer:

  • Remove the electrical connector to access the zero and span potentiometers
  • Connect the power supply to the transducer and allow the transducer to get to a stable temperature.
  • Connect the pressure source and set to the necessary low pressure value.
  • Adjust the zero potentiometer to required output at low pressure value.
  • Set the pressure source to the necessary high pressure value
  • Adjust the span potentiometer to required output at high pressure value
  • Release the pressure
  • Disconnect the pressure source and power supply
  • Refit the electrical connector

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Will be available soon.


Descriptions English Français Deutsch Italiano Japanese Português
Calibration Certificate Examples 1 Calibration Certificate Examples 1
Calibration Certificate Examples 2 Calibration Certificate Examples 2
Calibration Certificate Examples 3 Calibration Certificate Examples 3
UNIK 5000 platform Brochure UNIK 5000 platform Brochure UNIK 5000 platform Brochure UNIK 5000 platform Brochure UNIK 5000 platform Brochure UNIK 5000 platform Brochure
UNIK 5000 Series datasheet UNIK 5000 Series datasheet UNIK 5000 Series datasheet UNIK 5000 Series datasheet UNIK 5000 Series datasheet
UNIK 5600/5700 Marine certified datasheet UNIK 5600/5700 Marine certified datasheet
UNIK 5800/5900 Flame/Explosion-Proof datasheet UNIK 5800/5900 Flame/Explosion-Proof datasheet


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