OTT PLS-C Long Term Reliable Instruction Manual

OTT PLS-C Long Term Reliable Instruction Manual

OTT PLS-C

Long-term reliable readings

In addtion to water level and temperature, the OTT PLS-C unit measures conductivity thus providing basic water quality indicators. It is best suited for long-term use with solar or mains powered measuring stations and may be used for both surface water and groundwater measurements. Its top-quality features ensure long-term precise readings at attractive cost efficiency.
The particulary robust and precise ceramic capacitive pressure cell features long-term stability, nearly no drifting, and overload protection of at least four times the measuring range. For conductivity measurement, a four graphite electrode measuring cell is incorpo- rated. Thanks to its waterproof moulded electronics, saltwater resistant stainless steel enclosure (904L), and Kevlar reinforced probe cable, the PLS-C unit even withstands harsh operating conditions.
The probe may be easily incorporated into an existing infrastructure using the SDI-12 inter- face. When large distance communication is required, the RS-485 interface provides cable lengths of up to 1,000 m when used together with an OTT datalogger

Quality that pays off – OTT PLS-C

Features and benefits

• Relative pressure probe including pressure compensation capillary, temperature sensor, and conductivity cell
• Precise ceramic pressure cell featuring long-term stability – withstands mechanical impacts and aggressive media
• Exact water level data due to compensation of influencing factors (temperature, changes in atmospheric pressure, local gravitational acceleration, and specific water gravity)
• Four graphite electrode conductivity cell – remains unaffected by polarization effects and immune to contamination
• Fad 5 connection box – keeps moisture out of the connector area using a color coded desiccant
• Flexibility in use – may be connected to each datalogger fitted with SDI-12 interface
• Cable lengths of up to 3,280 ft thanks to RS-485 interface (together with OTT datalogger, g. OTT netDL)

Simplified communication during setup and calibration

• Simple Windows based software providing user guidance for calibration of conductivity sensor
• USB interface of the OTT netDL datalogger may be used to quickly and conveniently connect a notebook computer
• Alternatively: SDI-12/USB adapter for flexible connectivity (accessory)
• Pre-wired SDI-12 plug-in contact for convenient handling (accessory)

Applications

• Water quality monitoring
• Saltwater intrusion monitoring
• Groundwater monitoring during drilling operations involving fracking
• Studies on discharge water from farms
• Wastewater monitoring in mining
• Measurements in estuaries, swampland or moorland
• Tracer studies

Specifications

Output parameters
Water level/pressure, temperature, specific conductivity, salinity, TDS

Water level measurement (pressure)
– Pressure sensor: ceramic, temperature- compensated
– Measuring range: 13, 33, 66, 131, 328 ft
(4, 10, 20, 40, 100 m) water column

• Resolution: 01 % FS
• Accuracy (linearity + hysteresis):≤ ±0.05 % FS
• Long-term stability (linearity + hysteresis):≤ ±0.1 %/a FS
• Zerodrift: ≤ ±0.1 % FS
• Pressure sensor capability to withstand overloads: (without permanent mechanical damage)≥ 4x measuring range
• Temperature-compensated operating range: –5 °C … +45 °C (ice free)
• Units: m, cm, ft, mbar, psi

Temperature measurement

• Sensor: NTC
• Measuring range: – 25 °C … +70 °C (ice free)
• Calibrated range: +5 °C … 45 °C
• Resolution: 01 °C
• Accuracy: ±0.1 °C
• Units: °C, °F

Conductivity measurement Sensor: 4 graphite electrodes Measuring range 5 … 2,000 µS/cm:

• Resolution: 1 µS/cm

– Accuracy: ±1 µS/cm or ±0.5 % of measured value (whichever is higher)

• Unit: µS/cm

Measuring range 0.1…100 mS/cm:

• Resolution: 01 mS/cm
• Accuracy: ±0.01 mS/cm or ±1.5 % of measured value (whichever is higher)
• Unit: mS/cmCalibrated range: +5 °C … 45 °C

Temperature compensation options: freshwater, saltwater, standard method 2510, ISO 7888/EN27888
Salinity calculation options: Standard method, USGS 2311
Supply voltage
6 … 27 V DC, typically 12/24 V DC
Power consumption

• SDI-12 sleep mode: <30 µAV
• SDI-12 active mode: <32 mA

InterfacesSDI-12, RS-485 (SDI-12 protocol)
Storage temperature- 40 °C … + 85 °C
Cable length
Depending on interface-variant:- SDI-12: 1…328 ft (1…100 m)- RS-485: 1…3,280 ft (1…1,000 m)
Dimensions L x ØProbe: 12.5 in x 0.9 in (317 x 22 mm)

Weight

• Probe: 15.2 oz. (0.43 kg)
• Probe cable: 2.9 oz./m (82 g/m)

Housing material probe
POM, stainless steel (DIN 1.4539, 904 L), resistant to sea water
Type of protection Probe: IP68
EMC limits
Meets EG 2004/108/EC Meets EN 61326-1:2013

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