Model: TDS 602-1 Display: 4 + 4 Digit 0.5” & 0.39” 7-Segment Red LED Display Cell Constant*: 0.01 / 0.1 / 1 (user selectable, depends on range) Range (any one): 1–20 ppm, 5–200 ppm, 10–2000 ppm, 1–20 ppt, 5–200 ppt Accuracy: ±1% of range +1 digit Resolution: 0.01 ppm to 0.1 ppt (depends on range) Temperature Sensor: RTD – PT100 (3-wire) Temperature Coefficient: 0 to 3% / °C (user adjustable) Temperature Compensation: Manual / Automatic (-20.0 to +150.0 °C) Electrode Input: Conductivity cell on rear panel Set Point – 1 & 2: Two set points with 6 relay status selectable Relay Output: Relay-1 for Setpoint-1, Relay-2 for Setpoint-2 with 5A rating Relay Hysteresis: 0 to 500 counts (user adjustable) (only for High & Low control modes) Relay Cyclic Delay: 0 to 100 seconds (user adjustable) (only for High & Low control modes) Alarm Output (optional): Inbuilt audible buzzer with front-key reset Optional Re-Tx Output: Galvanically isolated 4–20 mA Optional Comm. Output: Isolated RS-485 Communication Protocol: MODBUS RTU Operating Environment: -10 to 50 °C / 10 to 95% RH non-condensing Power Supply: 90 to 270 V AC / DC, 50 Hz Enclosure: ABS plastics Dimension: 96 × 96 × 85 mm Cutout Dimension: 92 × 92 mm Weight: 350 grams (Approx.)