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Total Dissolved Gas Meters

Supersaturated water can kill your fish

Dissolved oxygen measurements are not enough--
oxygen levels may be acceptable while nitrogen levels may be lethal

Get the entire picture -- the sum total pressure of all dissolved gases

Calculate NITROGEN levels from TDG and a dissolved oxygen measurement

Monitor for supersaturated waters with one unit!

Total dissolved gas pressure is an important parameter for monitoring water quality effectively. When the total pressure of all the gases in the water exceeds the ambient atmospheric pressure at the water surface, supersaturation exists. The effect of excessive supersaturation on fish has been well documented, and if supersaturation exceeds the established safe levels, massive fish kills can occur.

Supersaturation can be caused by numerous man made and natural sources:

• Dam spillways which allow the discharge to plunge deeply into the receiving water
• Heated discharge of thermo-electric power plants can raise the temperature of the receiving water to a point of supersaturation
• Faulty water pumps used in aquaculture recirculatory systems can cause air entrainment if a leak occurs on the suction side of the pump
• Naturally high levels of nitrogen can be found in well water
• Algae blooms can cause increased levels of gas in the water

Precautions can be taken to keep supersaturation within safe levels, but accurate in-situ gas measurements must be made to determine if remedial action is effective. The TDG Sensor makes this measurement quick and easy

Applications:

• Use to monitor fish hatcheries, rearing ponds, holding tanks, aquariums, dams, etc. wherever fish are present
• Check well water and other critical water sources for age or for supersaturation caused by heated water or faulty pumps
• Check for supersaturation caused by heated water discharge at power plants, industrial sites, and sewer outfalls

Versions
TDG is available in multiple versions to meet the needs of water professionals:

	T506	T507	T900	T300E
General
Description	Sensor only	Sensor only	Sensor with 4, 10, or 20m cable	Sensor with 10m cable w/meter
Unit Type	Digital	Digital/Analog	Digital/Analog	Digital (LCD display only)
Material	Delrin, silicone, stainless steel	Delrin, silicone, stainless steel	Delrin, silicone, stainless steel	Delrin, PVC, silicone, stainless steel
Media Compatibility	Natural waters, either fresh, brackish, or saline	Natural waters, either fresh, brackish, or saline	Natural waters, either fresh, brackish, or saline	Natural waters, either fresh, brackish, or saline
Cable connection to Probe	Detachable non-vented oceangraphic connector	Detachable non-vented oceangraphic connector	Fixed vented cable	Fixed non-vented w/connector on the meter end
Probe Dimension	300mm X 45mm	300mm X 45mm	300mm X 45mm	127mm X 29mm
Weight				0.9 kG
Handheld option	--	--	RuggedReader, Pocket PC, PalmPilot	Analog Meter with LCD display
Environmental
Storage Temp w membrane	0C to 60C	0C to 60C	0C to 60C	0C to 60C
Storage Temp wo membrane	-40C to 60C	-40C to 60C	-40C to 60C	-40C to 60C
Operating Temp	0C to 45C	0C to 45C	0C to 45C	0C to 45C
Operational Depth	53 meters	53 meters	53 meters	53 meters
Max Depth	60 meters	60 meters	60 meters	60 meters
Power
Power Supply	External 6-13 VDC	External 8.6-13.6 VDC	External 8-16 VDC	2 Internal 9V alkaline batteries
Power Consumption	7 mA	7 mA	7 mA	1.5 mA
Output
Voltage	n/a	0.5 to 4.5 volt	0 to 5.0 volt	n/a
Digital	ASCII : 9600,8,N,1	ASCII : 9600,8,N,1	ASCII : 9600,8,N,1	3 DIGIT LCD
TDG Sensor
Type	Non-vented	Non-vented	Vented	Non-vented (Barometric reading can be zeroed)
Membrane cartridge	P/N 70-020	P/N 70-020	P/N 70-020	P/N 70-020
Recommended Deployment Interval	2-4 weeks	2-4 weeks	2-4 weeks	2-4 weeks
Measurement Method	Membrane diffusion	Membrane diffusion	Membrane diffusion	Membrane diffusion
Pressure Range	2 Atm	400 to 1400 mmHg	+/- 400 mmHg	+/- 750 mmHg
Pressure Resolution	0.0001 Atm	0.5 mmHg	0.5 mmHg	1 mmHg
Pressure Accuracy	+/-0.002 Atm	+/- 1.5 mmHg	+/- 1.5 mmHg	+/- 1 mmHg
Eqilibration Time to 90% of final	5 min	5 min	5 min	5 min
Output Temp Range	-30 to +50 deg C	-30 to +50 deg C	--	--
Output Temp Resolution	0.1 deg C	0.1 deg C	--	--
Output Temp Accuracy	+/- 0.25 deg C	+/- 0.25 deg C	--	--
Accessories
PC Connection	Available	Available	--	--
Cable Connections	Available but not included in list price. Waterproof oceanographic plug	Available but not  included in list price. Waterproof oceanographic plug	Included. Choice of three fixed lengths. Vented. Bare wire end for connection to controller.	5 meter length included. Custom lengths available.
Pressure Cap	Included	Included	Extra	Extra
Membrane Cartridge	One included	One included	One included	One included

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