Sensor Parameters

The highest quality sensor technology, for unsurpassed accuracy and reliability.

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Sensor
Parameter
Range
Resolution
Accuracy
Comments
temperature

temperature

-5 to 50 C

0.01

±0.1

calibration not required

pH/ORP

pH

ORP

0 to 14 units

-999 to 999 mV

0.01

0.1

±0.1 within 10°C of calibration or .2

±20 mV

refillable reference electrode; corrected for temperature; typical sensor life >6 years; optional ORP sensor is combined with pH sensor 

turbidity

turbidity

0 to 1000 FNU

1000 to 4000 FNU

0.01

±0.3 FNU or ±2% of reading w.i.g.

±4% of reading

filtered for non-turbidity spikes; includes wiper to clean the optics; FNU and NTU are interchangeable

transmissivity

transmissivity

0 to 100% transmission

0.01

linearity of 0.99 R²

transmissometer mounts externally to Manta 

dissolved oxygen (optical sensor)

concentration

0 to 20 mg/l

20 to 30 mg/l

30 to 50 mg/l

0.01

0.01

0.01

±0.1

±0.15

±5% of reading

compensated for temperature and salinity; EPA approved "lifetime" luminescence method; typical sensor cap life > 6 years

dissolved oxygen (optical sensor)

% saturation 

0 to 500% saturation

0.1

corresponds with the accuracy of the concentration reading

compensated for temperature and salinity; EPA approved "lifetime" luminescence method; typical sensor cap life > 6 years

conductivity

specific conductance, µS/cm

specific conductance, mS/cm

specific conductance, mS/cm

salinity

total dissolved solids (TDS)

0 to 5000 µS/cm

0 to 100 mS/cm

100 to 275 mS/cm

0 to 70 PSU

0 to 65 g/l

0.1

0.001

0.001

0.01

0.1

±0.5% of reading or ±1 w.i.g.

±1% of reading ±0.001

±2% of reading

±2% of reading

±5% of reading

corrected for temperature; four easy-to-clean graphite electrodes; optional sensor provides ±0.5% of reading accuracy to 100 mS/cm.


calculated from conductivity & temp, PSU equivalent to ppt


pressure

depth

depth

vented depth

barometric pressure

0 to 25 m

0 to 200 m

0 to 10 m

400 to 900 mm Hg

0.01

0.01

0.001

0.1

±0.05

±0.4

±0.003

±1.5

compensated for temperature and salinity

compensated for temperature and salinity

compensated for temp, salinity, barometric pressure

included with depth sensor

total dissolved gas (TDG)

Total Dissolved Gas

400 to 1,400 mm Hg

0.1

±1

compensated for temperature; maximum depth 15m

fluorometers

chlorophyll a - blue

chlorophyll a - red

rhodamine dye

Phycocyanin (freshwater BGA)

Phycoerythrin (marine BGA)

0 to 100 μg/l

0 to 500 μg/l

0 to 200 ppb

0 to 4500 ppb

0 to 700 ppb

0.01

linearity of 0.99 R²

highest-quality fluorometric sensors; fluorometers often require non-trivial calibration; custom optics available upon request

fluorometers

CDOM/FDOM

optical brightener

tryptophan

fluorescein dye

PTSA

0 to 500 ppb

0 to 300 ppb

0 to 5000 ppb

0 to 150 ppb

0 to 650 ppb

0.01

linearity of 0.99 R²

highest-quality fluorometric sensors; fluorometers often require non-trivial calibration; custom optics available upon request

fluorometers

refined oil

crude oil

0 to 20 ppm

0 to 300 ppb

0.01

linearity of 0.99 R²

highest-quality fluorometric sensors; fluorometers often require non-trivial calibration; custom optics available upon request

ion-selective electrodes (ISE's)

ammonium

nitrate

chloride

sodium

calcium

0 to 100 mg/l as nitrogen

0 to 100 mg/l as nitrogen

0.5 to 18,000 mg/l

0.05 to 20,000 mg/l

0 to 40,000 mg/l

0.1

±10% of reading or 2mg/L w.i.g.

corrected for ionic strength (via conductivity readings); the accuracy specification relies on non-trivial maintenance practice and frequent calibration near the temperature of measurement; sensors require periodic tip replacement

ion-selective electrodes (ISE's)

bromide

0 to 80,000 mg/l

.1

±10% of reading or 2mg/L w.i.g.

corrected for ionic strength (via conductivity readings); the accuracy specification relies on non-trivial maintenance practice and frequent calibration near the temperature of measurement; sensors require periodic tip replacement

PAR

photometric PAR

10,000 µmol/cm2

0.1

±5% of reading

LiCor spherical sensor

CO2

carbon dioxide

0 to 2000 ppm

0.1

±3% of full scale

other ranges available

FOR BEST ACCURACY, ALWAYS CALIBRATE NEAR THE ANTICIPATED FIELD READINGS, AND NEAR THE TEMPERATURE OF THE ANTICIPATED FIELD READINGS.

Specifications indicate typical performance and are subject to change. See www.waterprobes.com for current specifications.