These Total Dissolved Solids controllers (TDS) have been designed for TDS control in hydroponics, horticulture and water conditioning. Compact in size, they can be mounted in confined spaces or even right next to the vat or barrel containing the chemicals. These TDS conroller meters permit automatic control of installations previously checked manually. Readings are shown on the large display and the multicolored LED continuously indicates if the mini-controller is in measurement, dosing or alarm mode. The BL 983329 TDS controller can control TDS from 0 to 999 ppm.

You can also choose automatic or manual dosing mode with a switch on the front panel. Manual control is particularly useful during maintenance operations, because it permits you to enable or disable the dosing relay according to your need. The overtime control system advises you when the relay is active too long, helping to prevent over dosage.

• Range: 0 to 999 ppm
• Resolution: 0.1 ppm
• Accuracy: ±2% F.S.
• TDS Conversion Factor: 0.5
• Probe: HI 7634-00 (not included)
• Temperature Compensation: Automatic, 5 to 50°C (41 to 122°F) with ß=2%/°C
• Calibration: Manual, with CAL trimmer
• Dosing Relay: 1, max 2A (fuse protected), 250 Vac, 30 Vdc (Contact closed when reading exceeds setpoint value)
• Setpoint: Adjustable from 0 to 49.9 ppm.
• Overtime: Adjustable, typically from 5 to approx. 30 minutes.
• Dimensions: 83 x 53 x 99 mm (3.3 x 2.1 x 3.9")
• Power: 115/230 VAC