pH700 pH Analyser
pH700 pH Analyser

Loop or mains power

The pH700 is an on-line pH analyser available as a 4-wire mains powered unit or a 2-wire loop-powered unit. The loop-powered unit requires a supply voltage between 16 and 35V and re-transmits the pH value by varying the loop current between 4 and 20mA. The mains powered unit runs on either 110 or 230V (specify the required voltage when ordering) and re-transmits the pH value on a separate 24V loop.

Sensor Compatibility

pH700 analysers can accept standard pH sensor inputs, allowing easy upgrade for existing installations.

Dual Alarm Relays/Analog Outputs

AC operated systems provide two relays that are configurable for control, alarm or timer mode of operation.

Diagnostic Messaging

Diagnostic messages provide a clear description of system condition, which eliminates confusing error codes that are difficult to decipher.

Flexible Calibration

Two-point and sample calibration options include auto-buffer recognition for 13 built-in buffer tables. Manual override of the automatic buffer values allows for user to customize values. All calibration methods include stability monitors to check temperature and main parameter stability before accepting data.

Standard PID Output

A PID control output is standard in every pH700, with control parameters easily user configurable.

Technical Specifications

Main Parameter RangepH: 0.00 to 14.00 pH
ORP: -1000 to +2000 mV
Sensor voltage±500 mV (pH)
Loop current4.00 to 20.00 mA
Sensor temperature-10 to 110°C (14 to 230°F)
Input Impedance>1013 Ω
Repeatability0.1% of span or better
Sensitivity0.05% of span
Non-linearity0.1% of span
Stability0.05% of span per 24 hours
Temperature DriftSpan or zero, 0.02% of span/°C
Warm-Up Time7 seconds to rated performance
Response Time6 seconds to 90% of step input at lowest setting
Max. Sensor to Analyzer Distance25 feet (7.6 meters) without preamp
Sensor TypesCombination-style pH or ORP with temperature compensation
EnclosureNEMA 4X, IP66, polycarbonate, weatherproof and corrosion resistant, 124 x 124 x 140 mm (HWD)
Mounting OptionsWall, panel, pipe/handrail
Conduit OpeningsThree M16 threaded entries, 3 cord-grips and 2 conduit adapters included
Weight2-wire units: 0.45 kg
AC power units: 0.9 kg
DisplayLarge, high-contrast, LCD
4-digit main display with sign, 19mm seven-segment characters
12-digit alpha-numeric second line display, 7.6mm 5 x 7 dot matrix characters
Ambient TemperatureService: -20 to 60°C (-4 to 140 °F)
Storage: -30 to 70°C (-22 to 158 °F)
Ambient Humidity0 to 95%, non-condensing
LocationDesigned for non-hazardous areas
EMI/RFI InfluenceDesigned to EN 61326-1
Output Isolation600 V galvanic isolation
FilterAdjustable, 0-9.9 minutes additional damping to 90% step input
Temperature InputSelectable Pt1000 or Pt100 RTD with automatic compensation
Power16-35 VDC for loop-powered unit115/230 VAC, 50/60 Hz., 10 VA
Control RelaysTwo SPDT relays, 6A @ 250 VAC, 5A @ 24 VDC, resistive
Relay ModeProgrammable for control, alarm, or timer function
Analog OutputsIsolated 4-20 mA, 550 ohm max. load. Two assignable 4-20 mA outputs, 550 ohm max. (AC only)


Page reviewed: 18th December 2017