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.
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 messages provide a clear description of system condition, which eliminates confusing error codes that are difficult to decipher.
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.
|Main Parameter Range||pH: 0.00 to 14.00 pH|
ORP: -1000 to +2000 mV
|Sensor voltage||±500 mV (pH)|
|Loop current||4.00 to 20.00 mA|
|Sensor temperature||-10 to 110°C (14 to 230°F)|
|Input Impedance||>1013 Ω|
|Repeatability||0.1% of span or better|
|Sensitivity||0.05% of span|
|Non-linearity||0.1% of span|
|Stability||0.05% of span per 24 hours|
|Temperature Drift||Span or zero, 0.02% of span/°C|
|Warm-Up Time||7 seconds to rated performance|
|Response Time||6 seconds to 90% of step input at lowest setting|
|Max. Sensor to Analyzer Distance||25 feet (7.6 meters) without preamp|
|Sensor Types||Combination-style pH or ORP with temperature compensation|
|Enclosure||NEMA 4X, IP66, polycarbonate, weatherproof and corrosion resistant, 124 x 124 x 140 mm (HWD)|
|Mounting Options||Wall, panel, pipe/handrail|
|Conduit Openings||Three M16 threaded entries, 3 cord-grips and 2 conduit adapters included|
|Weight||2-wire units: 0.45 kg|
AC power units: 0.9 kg
|Display||Large, 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 Temperature||Service: -20 to 60°C (-4 to 140 °F) |
Storage: -30 to 70°C (-22 to 158 °F)
|Ambient Humidity||0 to 95%, non-condensing|
|Location||Designed for non-hazardous areas|
|EMI/RFI Influence||Designed to EN 61326-1|
|Output Isolation||600 V galvanic isolation|
|Filter||Adjustable, 0-9.9 minutes additional damping to 90% step input|
|Temperature Input||Selectable Pt1000 or Pt100 RTD with automatic compensation|
|Power||16-35 VDC for loop-powered unit115/230 VAC, 50/60 Hz., 10 VA|
|Control Relays||Two SPDT relays, 6A @ 250 VAC, 5A @ 24 VDC, resistive|
|Relay Mode||Programmable for control, alarm, or timer function|
|Analog Outputs||Isolated 4-20 mA, 550 ohm max. load. Two assignable 4-20 mA outputs, 550 ohm max. (AC only)|