AH-151

pH meter with automatic calibration function

AH-151-CH (dip type), -CF (flow-through type), -FK (water sampling type)

Glass electrode method

pH: 0 to 14    Resolution: 0.01 pH
Temperature: 0 to 100°C    Resolution: 0.1 degree C

Touch panel (TFT color LCD)

pH: within ±0.02 pH, Temperature: ±0.3°C (Equivalent input)

pH: within ±0.03 pH, Temperature: ±0.3°C (Equivalent input)

Number of output points: 2, Output form: 4 to 20 mA DC input/output insulation type, Load resistance: Maximum 900 Ω
Output range 1: pH: Can be arbitrarily set within the measuring range
Output range 2: Temperature: Can be arbitrarily set within the range of -10 to 110°C
Hold function: Can be arbitrarily set by selecting from “last value hold,” “any value hold,” and “without hold”

Number of output points: 9 and 1 (abnormality alarm), Output form: No-voltage contact output,
Alarm details: Calibration errors (asymmetric potential abnormality, sensitivity abnormality, response time abnormality), electrode abnormalities (glass response membrane crack, short circuiting of temperature sensor, disconnection of temperature sensor), abnormalities of converter (CPU abnormality, ADC abnormality, memory abnormality), shortage of cleaning solution, shortage of calibration solution

0.1 to 168.0 hours, Month, day and time of start of next cleaning can be set, Cleaning time: Approx. 2 minutes (default setting)

1 to 999 hours, Month, day and time of start of next calibration can be set, Calibration time: Approx. 5 minutes (default setting when pH electrode is new)

Number of input points: 3, Contact: No-voltage “a” contact for open collector, Contact function: External commands for cleaning performance (automatic cleaning start, automatic calibration start, stand-by commands)

RS-485 two-wire system, Input/output insulation type (not insulated from transmission output)

Glass electrode 6108

Automatic calibration (lift-up type calibration with standard solution spray) or manual calibration

Lift-up type cleaning with cleaning solution

Calibration error, Electrode check, System error

Pressure: Atmospheric pressure, Temperature: -5 to 80°C, Flow velocity: 2 m/sec or less, Flow rate: 10 L/min or less (only for flow-through type), Conductivity: 10 mS/m (100 μS/cm) or more

Two solutions (pH7 and pH4 or pH9), Consumption: Approx. 30 to 40 mL/min (max. 200 mL/calibration), Capacity: PE tank 3 L (calibration approx. 15 to 50 times possible)

HCI: less than 5 to 10%, Consumption: Approx. 50 mL/cleaning (approx. 75,100 mL/cleaning, adjustable)  Capacity: PE tank 20 L (cleaning approx. 300 times possible, using 50 mL each time)

Water quality: Tap water equivalent (industrial water possible), Pressure: 0.2 to 0.75 MPa, Consumption: 10 to 20 L/cleaning, calibration one time (in case of default setting for cleaning time)

Air quality: Instrument air, Pressure: 0.3 to 0.7 MPa, Consumption: 10 to 15 L/min

Supply water: Rc1/2, Air: Rc1/4

8 cable glands for φ7 to φ12 (without cable gland, φ21.5 hole)

0 to 50°C (no condensation)

Voltage range: 100 to 240V AC ±10%, 50/60 Hz, Power consumption: 100V AC, approx. 20 W during steady state and approx. 35 W during auto-calibration

Outdoor setting type: JIS C0920 explosion/splash-proof type (IP54 equivalent), Material of control unit case: SPCC (coated with melamine-based epoxy resin), Metal fittings: SUS304, Stand: SUS304

Operation unit & pole stand: Approx. 60 kg, Metal fittings: Approx. 3 kg, Lifting unit (dip type): Approx. 1.5 kg (except for dip-type holder)