The S141 Light Sensor has been developed for use with the A111 Halogen Light Source and C901 Logger Pro software to provide irradiance data in units of µmol quanta/m2/s. Customized setup and calibration files are available to users of Logger Pro software. The sensor can be calibrated by the user for stand-alone operation or for relative measurements of light intensity.  The maximum photosensitivity of the sensor is in the 500-600nm range (most appropriate for halogen light source).

The Light Sensor may be mounted directly under Qubit Systems’ G112 Flow-Through Leaf Chamber for use in photosynthesis measurements with the halogen light source.

The S141 Light Sensor is included in PH1LP Photosynthesis Package

Specifications:

• 0-4 V analog output to data interface
• Small surface area (2.4 x 2.8 mm)
• Selectable ranges (0-100, 0-300, 0-1150 µmol quanta/m2/s) with corrections for use under leaves or in direct halogen light.
• size (h/w/l) cm:  3.0/5.4/8.3
• weight (g): 110
• materials: plastic (black)
• warranty: 1 years

the S132 Stainless Steel Temperature Probe is a rugged and durable probe with a sealed stainless steel shaft and tip that can be used in organic liquids, salt solutions, acids, and bases.

The S132 temperature sensor is included in the NF1LP Nitrogen Fixation Package, SR1LP Soil Respiration and RP2LP and RP1LP Respiration Packages. It is also available for sale individually and can be modified to work with any data acquisition hardware and software.

Specifications:

• Temperature Range: -40 to 135oC
• 12-bit resolution (when used with LabPro Interface):0.17^oC when used in the range: -40 to 0^oC, 0.03^oC when used in the range: 0 to 40^oC, 0.1^oC when used in the range: 40 to 100^oC, 0.25^oC when used in the range: 100 to 135^oC
• Accuracy: +/-0.2^oC at 0^oC, +/-0.5^oC at 100^oC
• Response time (t90):  10 sec (in water, with stirring),  90 sec (in moving air),  400 sec (in still air)
• Dimensions: Length (handle + body) = 15.5 cm, Stainless steel body = length – 10.5 cm, diameter – 4.0 mm, Probe handle = length – 5.0 cm, diameter – 1.25 cm

The S125 Conductivity Sensor is used for environmental testing of salinity, total dissolved solids (TDS), or conductivity in water samples.

The S125 Conductivity Sensor can be used in teaching to demonstrate diffusion of ions through membranes or to monitor changes in ion levels in aquatic systems. In Chemistry education  it can be used  to investigate the difference between ionic and molecular compounds, strong and weak acids, or ionic compounds that yield different ratios of ions. The Conductivity Probe can monitor concentration or conductivity at three different sensitivity settings.

Readings can be taken in units of conductivity (µS/cm) or concentration (mg/L TDS as NaCl) At three different sensitivity settings:

0-100 mg/L TDS or 0-200 µS/cm
0-1000 mg/L TDS or 0-2000 µS/cm
0-10000 mg/L TDS or 0-20,000 µS/cm

Conductivity is directly proportional to concentration over the entire range.

The probe has a fast response time, reaching 98% of full value in less than 5 seconds. We recommend using it with C410 LabPro acquisition Interface or C420 Go-Link USB data acquisition interface and C901 LoggerPro data acquisition software.  You can load pre-saved calibrations.  Alternatively, you can do a quick two-point calibration: the probe is left out of solution for one calibration point (0 µS/cm) and is placed in a known standard (1000 µS/cm solution is provided) for a second calibration point. More precise calibration in two different standards is also possible using our C901 LoggerPro software.

The S125 Conductivity Sensor uses alternating current at its electrodes; this prevents polarization and electrolysis, so that solutions being tested are not fouled. Corrosion of metal electrodes is not a problem with this epoxy-body graphite electrode. It has built-in temperature compensation, which allows performance of calibrations in the lab, and measurements outdoors without temperature changes affecting conductivity readings.

The S125 Conductivity Sensor comes with a Sodium Chloride Calibration Standard (equivalent to 1000 uS/cm, 491 mg/L as NaCI, or 500 mg/L TDS) and the Conductivity Sensor Manual.

The S181 Absolute Pressure Sensor is typically used as a stand alone sensor to measure atmospheric pressure. To collect and display the data consider our C410 LabPro data acquisition interface and C901 LoggerPro software

Specifications:

• State-of-the-art monolithic silicon pressure sensor
• Response Time: 1 ms
• Pressure Range: 15 – 115 kPa
• Voltage Output: 0 – 2 V
• Temperature Compensated
• Analog output may be recorded by a chart recorder or Analong-to-Digital Interface (C410 LabPro Interface)
• warranty: 1 years

The S172Dissolved O2 Cuvette Thermistor is incorporated into the plunger of the cuvette so that it measures the temperature of the sample directly. This allows corrections to be made for measurements of dissolved oxygen when the oxygen electrode is calibrated at one temperature and used at a different temperature. It also allows accurate investigations of the temperature dependence of physiological and biochemical processes.

The tip of the thermistor is very fine and encased in glass. It protrudes slightly from the lower surface of the plunger to make contact with liquid in the sample chamber.

The S171 Leaf Chamber Thermistor is accurate and rapid in measuring of leaf surface temperature.   It is essential for studying leaf CO2 and water vapor conductance.

The S171 Leaf Chamber Thermistor’s sensor head is a glass coated thermocouple and only 0.75 mm in diameter. The sensor housing screws into the base of the G112 Flow-Through Leaf Chamber and the sensor position can be easily adjusted to touch the surface of the leaf.

The S171 Leaf Chamber Thermistor is an optional addition to Q-Box CO650 Plant CO2 Analysis Packages. It comes fully calibrated and plugs directly into the C410 LabPro Interface and displays values of leaf temperature on a computer screen using C901 Logger Pro Software.

Qubit’s S165 pH Sensor can be substituted for any traditional pH meter. The advantages are trifold: automated data collection, graphing and data analysis using the C410 LabPro Interface and C901 Logger Pro Software. For field work, it can be used with a Palm hand-held computer and C915 Palm/Data Pro software.

• materials: Sealed, gel-filled, epoxy body, Ag/AgCI
• Response time: 90% of final reading in 1 second
• Temperature range: 5 to 80^oC
• 12 mm Outer Diameter
• pH range: pH 0 – 14
• 12 bit resolution (with LabPro Interface) 0.005 pH units
• Isopotential pH:  pH 7
• Output: 59.2 mV/pH at 25^oC
• warranty : 2 years

The pH sensor is factory-calibrated. If re-calibration is required, it is a simple two point procedure using buffer solutions. Qubit can supply a buffer kit including 4 tablets each of buffer pH 4, 7, and 10. Each tablet is added to 100 mL of distilled water to prepare respective pH buffer solutions.

Applications include:

• Acid-base titrations
• Investigations of acid rain and buffering
• Investigations of water quality in streams and lakes
• Monitoring pH change during chemical reactions
• Monitoring pH changes in an aquarium as a result of photosynthesis

Qubit Systems’ combined S161 Humidity and Temperature Sensor allows simultaneous measurements of relative humidity and air temperature in a flow through gas. Water vapor concentration can then be calculated in absolute units. No calibration is needed if used with  C901 Logger Pro software and the associated calibration files (factory calibrated).  We recommend the use of C410 LabPro data acquisition interface with S161 for logging the temperature and relative humidity of a gas.

The S161 Humidity and Temperature sensor is only 5 x 8 x 3 (cm) and has a temperature range of -50 to 100°C. The relative humidity  range is from 0 to 100%.

The S161 Humidity and Temperature Sensor is ideal for transpiration measurements in an open-flow gas exchange system. It comes with our CO650 Advanced CO2 Analysis Packages and is optional in the CO750 Field Package.

It may also be used to study water loss from animals or to observe temperature and humidity levels in environmental chambers.

Specifications:

• power supply: 9V, 0.56A
• size (h/w/l): 3.0cm/5.4cm/8.3cm
• weight : 200 g
• materials plastic (black)
• warranty: 1 years