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Light Sensors

Light Sensors

Light Sensors

Hansatech Instruments light sensors have been designed to provide a means of light source calibration for both the oxygen and fluorescence instrumentation product range. The Quantitherm has been designed as a method of pre-determining the incident light and temperature within the liquid-phase oxygen electrode chambers. However, please note that this unit is not designed as a submersible sensor and should not be immersed in the sample.

The QSPAR and QSRED large area quantum sensors are intended either as stand alone field portable PAR sensors or as a calibration tool for the LH36/2R (QSRED) and LS2 (QSPAR). Both units are fully cosine corrected and have analogue outputs which may be connected to an external chart recorder or data logger.

The SQS+ has dual functionality serving first and foremost as an automatic calibration tool for the Handy PEA+ fluorimeter and secondly as a stand alone PAR sensor. When connected to a PC via USB, comprehensive Windows software allows PAR values to be logged at user defined periods for durations of up to a month.

  • Quantitherm PAR/Temp Sensor
  • QSPAR Quantum Sensor
  • QSRED Quantum Sensor
  • USB quantum sensor

Quantitherm PAR/Temp Sensor

  • Compact, fully portable handheld unit with QTP1 combined PAR/temperature probe sensor
  • Temperature sensor range of 0°C – 50°C with 0.02°C resolution
  • LCD digital display of PAR & temperature values (°C or °F)
  • QTP1+ suspends vertically in reaction vessel of liquid-phase oxygen electrode chambers allowing light source calibration
  • 0V – 5V analogue output of PAR & temperature signals.

Quantitherm PAR/Temp Sensor

The Quantitherm consists of the QRT1 handheld display unit combined with the QTP1+ probe sensor. For use as a calibration tool for the LS2 light source, the QTP1+ probe connects directly to the QRT1 control unit allowing real-time measurement of light intensity via the built-in screen. The light intensity of the LS2 Light source can then be adjusted using the neutral density filters provided.

The QRT1 quantum sensor provides a displayed resolution of 1 µmol m-2 s-1 throughout the 0 µmol m-2 s-1 – 5,000 µmol m-2 s-1 range and up to a maximum of 50,000 µmol m-2 s-1 with a displayed resolution of 10 µmol m-2 s-1.
QTP1 probe

The QTP1+ probe sensor connects to the QRT1 control unit via a Mini-DIN connection. The probe is designed to be mounted directly into the DW1, DW1/AD, DW2/2, DW3 and Oxytherm+ electrode chambers via the use of suitable mounting collars (mounting collar for DW1 and DW2/2 supplied, collars for DW3 and Oxytherm+ supplied with respective items).
Despite being intended for light source calibration in liquid-phase oxygen electrode chambers, the PAR/temperature probe sensor must not be submerged in liquid. Although the probe is splash proof, prolonged contact with liquid will irreversibly damage the sensor. Calibration of light sources should be performed prior to the addition of samples. Damage caused by submersion will not be covered by warranty.
The probe consists of a PAR quantum sensor and a thermistor bead for temperature measurement and is constructed from stainless steel and acetal. Temperature is measured by an RT curve matched-type glass bead thermistor mounted centrally in the probe tip. Photosynthetically Active Radiation (PAR) levels are determined by a quantum sensor located in the side wall of the probe.

The QTP1+ probe may also be connected directly to the rear of the Oxylab+ oxygen electrode control unit. OxyTrace+ software plots the temperature signal from the QTP1+ in real-time as a chart recorder emulation on the same screen as the signal from the S1 oxygen electrode disc. PAR values are also displayed in the OxyTrace+ software light source calibration routine providing a convenient display of measured values during the light source calibration process.

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QSPAR Quantum Sensor

  • Compact, fully portable handheld light meter with matched cosine corrected, large-area quantum sensor
  • LCD digital display of PAR radiation
  • Filtered for 400nm – 700nm waveband
  • 3 measurement ranges (0 µmol m-2 s-1 – 20 µmol m-2 s-1, 0 µmol m-2 s-1 – 200 µmol m-2 s-1 & 0 µmol m-2 s-1 – 2,000 µmol m-2 s-1)
  • 0V – 2V analogue output of PAR signal
  • Compatible for use with DW3, LD1/2 & LD2/3 electrode chambers as a light source calibration tool.

Technical Specifications

  • Measuring Range: 0 μmol m-2 s-1 – 2,000 μmol m-2 s-1 in 3 ranges (0 μmol m-2 s-1 – 20.00 μmol m-2 s-1, 0 μmol m-2 s-1 – 200.0 μmol m-2 s-1, 0 μmol m-2 s-1 – 2,000 μmol m-2 s-1) in the 400nm – 700nm waveband
  • Resolution:
  • 1 μmol m-2 s-1 at 0 μmol m-2 s-1 – 2,000 μmol m-2 s-1
  • 0.1 μmol m-2 s-1 at 0 μmol m-2 s-1 – 200.0 μmol m-2 s-1
  • 0.01 μmol m-2 s-1 at 0 μmol m-2 s-1 – 20.00 μmol m-2 s-1
  • PAR Sensor: Silicon photodiode/optical filter combination with white acetal diffuser (37mm dia.)
  • Signal Display: Hand-held display unit with LCD. 0V – 2V analogue output of measured values
  • Power Requirement: 1 x 9V PP3 cell
  • Dimensions Display (HWD): 146mm x 78mm x 35mm
  • Weight: 238g (including battery).
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QSRED Quantum Sensor

  • Compact, fully portable handheld light meter with matched cosine corrected, large-area quantum sensor
  • LCD digital display of PAR radiation
  • Filtered for 550nm – 750nm waveband
  • 3 measurement ranges (0 µmol m-2 s-1 – 20 µmol m-2 s-1, 0 µmol m-2 s-1 – 200 µmol m-2 s-1 & 0 µmol m-2 s-1 – 2,000 µmol m-2 s-1)
  • 0V – 2V analogue output of PAR signal
  • Compatible for use with DW3, LD1/2 & LD2/3 electrode chambers as a light source calibration tool.

Overview

The QSRED quantum sensor consists of a handheld display unit and matched cosine corrected sensor head containing a special high-grade photocell filtered for the 550nm – 750nm waveband. The μmol m-2 s-1 value from the sensor is displayed on the LCD display. 3 measurement ranges allow maximum sensitivity from 0 μmol m-2 s-1 – 2,000 μmol m-2 s-1.

QSRED is supplied with the Leaflab 2+ system to assist with effective calibration of the LH36/2R light source. Each unit is supplied with an individual certificate showing that system calibration has been carried out against a National Physical Laboratory (NPL) calibrated reference lamp.

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USB quantum sensor

  • Fully cosine corrected serial quantum sensor with dual functionality
  • Filtered for 400nm – 700nm waveband
  • Measurement range of 0 µmol m-2 s-1 – 5,000 µmol m-2 s-1 with 1 µmol m-2 s-1 resolution
  • Logs PAR values at user defined intervals directly to the PC screen on simultaneous graphical & digital display software
  • Provides a light source calibration tool & instant light meter for the Handy PEA+ chlorophyll fluorimeter.

Overview

The SQS+ USB quantum sensor is a PAR (400nm – 700nm) filtered, fully cosine corrected light meter. It can be used to log PAR values to a remote PC at user-defined intervals via a USB link. Custom software allows the SQS+ to display real-time PAR values both graphically and as a digital panel meter and provides the function to save recorded values as a comma delimited (*.CSV) file for import to programs, such as Microsoft Excel®, for further analysis.

SQS+ can also be used as a calibration tool for the Handy PEA+ fluorimeter by entering values measured by SQS+ into the relevant light source calibration function on the Handy PEA+ itself.

- For stand-alone light meter: Cat. no. SQS+
- For Handy PEA+ calibration tool: Cat. no. HPEA/SQS+

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