LeveLine-Mini-CTD: Titanium SDI-12 level, temperature, conductivity and salinity sensor

The LeveLine-Mini-CTD


The LeveLine-Mini-CTD Nose cone removed showing the conductivity sensor LeveLine-CTD being deployed

A quick introduction to the LeveLine-Mini-CTD

LeveLine-Mini-CTD

The LeveLine-Mini-CTD adds conductivity and salinity measurements to the small SDI-12 ready sensor. Like the standard LeveLine-Mini, the CTD version is housed in a titanium body making it suitable for deployment in both fresh and salt waters. It also features the same titanium connector as the larger LeveLine loggers. The connector allows the unit to be connected to your PC or to the GPS LeveLine Meter to calibrate the conductivity sensor.

The LeveLine-Mini-CTD is available in both absolute and gauge versions. If your chosen datalogger / telemetry device includes a built-in air pressure sensor, we recommend the absolute version as the logging device can utilise the air pressure reading for compensation. If an air pressure sensor is unavailable then the gauge version is best suited for telemetric logging.

Gauge sensors require vented cables and desiccant cartridges to remove any moisture from the vent to prevent blocking and inaccurate compensation.

LeveLine-Mini as part of the LeveLine-EWS Package

The LeveLine-Mini is the level sensor used in the Early Warning System to alert for rising water levels.

The clever AquaTelemetry system features a built in pressure sensor meaning the level data recorded by the system is fully compensated for changes in barometric air pressure.

Connect to any SDI-12 datalogger or telemetry device

The LeveLine-Mini has SDI-12 and Modbus (RS485) outputs as standard meaning you can connect this sensor to any established monitoring platform that accepts these protocols.

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Temperature ranges	Operational: -20-80° C (-4-176° F) Storage: -40-80° C (-40-176° F) Compensated: -20-80° C (-4-176° F)	Operational: -20-80° C (-4-176° F) Storage: -40-80° C (-40-176° F) Compensated: -20-80° C (-4-176° F)	Operational: -20-80° C (-4-176° F) Storage: -40-80° C (-40-176° F) Compensated: -20-80° C (-4-176° F)	Operational: -20-80° C (-4-176° F) Storage: -40-80° C (-40-176° F) Compensated: -20-80° C (-4-176° F)	Operational: -20-80° C (-4-176° F) Storage: -40-80° C (-40-176° F) Compensated: -20-80° C (-4-176° F)
Diameter	22.2mm (0.875 in)	22.2mm (0.875 in)	22.2mm (0.875 in)	22mm	22mm
Length	186mm (7.32 in)	186mm (7.32 in)	87mm (3.43 in)	260mm	146mm
Weight	150g (5.3oz)	160g (5.6oz)	120g (4.2oz)	250g	210g
Materials	Titanium body, Delrin nose cone	Stainless Steel body, Delrin nose cone	Stainless Steel body, Delrin nose cone	Titanium body, Delrin nose cone	Titanium body, Delrin nose cone
Output options	Modbus/RS485, SDI-12, Aquaread proprietary	Modbus/RS485, SDI-12, Aquaread proprietary	Modbus/RS485, SDI-12, Aquaread proprietary	Modbus/RS485, SDI-12, Aquaread proprietary	Modbus/RS485, SDI-12, Aquaread proprietary
Battery type & life	3.6V lithium; up to 10 years (see note 1)	3.6V lithium; up to 10 years (see note 1)	N/A	3.6V lithium; up to 10 years (see note 1)	N/A
External power	6 – 30 VDC	6 – 30 VDC	6 – 30 VDC	6 – 24 VDC	6 – 24 VDC

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Size	8.0 MB	2.0 MB	N/A	8.0 MB	N/A
Data records	500,000	150,000	N/A	500,000	N/A
Log types	Linear, Event & User-Selectable Schedule with Future Start, Future Stop, Deploy Start and Real Time View	Linear, Event & User-Selectable Schedule with Future Start, Future Stop, Deploy Start and Real Time View	N/A	Linear, Event & User-Selectable Schedule with Future Start, Future Stop, Deploy Start and Real Time View	N/A
Fastest logging rate & Modbus rate	10 per second	1 per minute (logging) 5 per second (Modbus)	10 per second (Modbus Rate)	1 per second	1 per second
Fastest SDI-12 output rate	1 per second	1 per second	1 per second	1 per second	1 per second
Real-time clock	Accurate to 1 second/24-hr period (± 6 minutes/year)	Accurate to 1 second/24-hr period (± 6 minutes/year)	N/A	Accurate to 1 second/24-hr period (± 6 minutes/year)	N/A

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Type / Material	Piezoresistive; ceramic	Piezoresistive; ceramic	Piezoresistive; ceramic	Piezoresistive; ceramic	Piezoresistive; ceramic
Range (Absolute)	10.0m (32.8 ft), 20.0m (65.6 ft), 50.0m (164 ft), 100m (326 ft), 200m (656 ft)	0 to 16.7 psi; 0 to 1.15 bar	10.0m (32.8 ft), 20.0m (65.6 ft), 50.0m (164 ft), 100m (326 ft), 200m (656 ft)	10.0M (32.8 ft), 50.0M (164 ft), 20.0M (65.6 ft), 100M (326 ft)	10.0M (32.8 ft), 50.0M (164 ft), 20.0M (65.6 ft), 100M (326 ft)
Range (Gauge)	10.0m (32.8 ft), 20.0m (65.6 ft), 50.0m (164 ft), 100m (326 ft), 200m (656 ft)	N/A	N/A	10.0M (32.8 ft), 50.0M (164 ft), 20.0M (65.6 ft), 100M (326 ft)	10.0M (32.8 ft), 50.0M (164 ft), 20.0M (65.6 ft), 100M (326 ft)
Maximum pressure	Max 2x range, Burst 2.5x range	Max 2x range, Burst 2.5x range	Max 2x range, Burst 2.5x range	Max 2x range, Burst 2.5x range	Max 2x range, Burst 2.5x range
Accuracy (FS) (see note 3)	±0.05% FS	±0.1% FS	±0.05% FS	±0.05% FS	±0.05% FS
Accuracy (FS) (See note 2)	±0.1% FS	±0.2% FS	±0.1% FS	±0.1% FS	±0.1% FS
Resolution	0.005% FS or 1mm whichever is greater	0.1mb	0.005% FS or 1mm whichever is greater	0.002% FS or 1mm whichever is greater	0.002% FS or 1mm whichever is greater
Units of measure	Pressure: psi, kPa, bar, mbar, mmHg, inHg, cmH2O, inH2O, Level: in, ft, mm, cm, m	Pressure: psi, kPa, bar, mbar, mmHg, inHg, cmH2O, inH2O	Pressure: psi, kPa, bar, mbar, mmHg, inHg, cmH2O, inH2O, Level: in, ft, mm, cm, m	Pressure: mbar (psi, kPa, bar, mbar, mmHg, inHg, cmH2O, inH2O, Level: in, ft, mm, cm and m available in LeveLink	Pressure: mbar (psi, kPa, bar, mbar, mmHg, inHg, cmH2O, inH2O, Level: in, ft, mm, cm and m available in LeveLink

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Range	N/A	N/A	N/A	0 – 200mS/cm (0 – 200,000µS/cm)	0 – 200mS/cm (0 – 200,000µS/cm)
Resolution	N/A	N/A	N/A	1µS	1µS
Accuracy	N/A	N/A	N/A	± 1% reading or ±1µS whichever is greater (see note 5)	± 1% reading or ±1µS whichever is greater (see note 5)

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Range	N/A	N/A	N/A	0 – 70 PSU / 0 – 70 ppt (g/Kg)	0 – 70 PSU / 0 – 70 ppt (g/Kg)
Resolution	N/A	N/A	N/A	0.01PSU / 0.01 ppt	0.01PSU / 0.01 ppt
Accuracy	N/A	N/A	N/A	±1% reading or ± 0.1 unit if greater	±1% reading or ± 0.1 unit if greater

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LeveLine-Mini-CTD: Titanium SDI-12 level, temperature, conductivity and salinity sensor

The LeveLine-Mini-CTD

LeveLine-Mini-CTD

LeveLine-Mini as part of the LeveLine-EWS Package

Connect to any SDI-12 datalogger or telemetry device

GENERAL

MEMORY

SENSOR

ELECTRICAL CONDUCTIVITY

SALINITY (note 4)

TEMPERATURE SENSOR

WARRANTY

Similar Category

	LEVELINE – (Abs & Gauge)	LEVELINE – BARO	LEVELINE- MINI	LeveLine-CTD	LeveLine-Mini-CTD
Accuracy Resolution	±0.1° C 0.01° C	±0.1° C 0.01° C	±0.1° C 0.01° C	±0.1° C; 0.01° C	±0.1° C; 0.01° C
Units of measure	Celsius	Celsius	Celsius	Celsius (fahrenheit available in LeveLink)	Celsius (fahrenheit available in LeveLink)