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Items
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Description
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Measuring principle
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Electrochemical
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Input ranges
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pH: -2 to 16 pH
ORP: -1500 to 1500 mV
rH: 0 to 100rH
Temperature: -30 to 140 deg C (Pt1000)
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Transmission signals
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General: Two isolated outputs of 4 to 20mA DC with common negative. Maximum load 600 Ω. Bi-directional HART® digital communication, superimposed on mA1 (4 to 20mA) signal.
Output function: Linear or Non-linear (21-step table) output for pH, temperature, ORP or rH.
Control function: PID control.
Burn out function: Burn up (21.0mA) or burn down (3.6mA) to signal failure accorded with NAMUR NE43.
Hold: The mA-outputs are frozen to the last/fixed value during calibration/commissioning.
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Contact outputs
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General: Four SPDT relay contacts with display indicators.
Switch capacity: Maximum values 100 VA, 250 V AC, 5 A; Maximum values 50 W, 250 V DC, 5 A
Status: High/Low process alarms, selected from pH, ORP, rH and temperature. Configurable delay time and hysteresis. Failure annunciation.
Control function: On/Off, PID duty cycle or pulsed frequency control.
Wash: Contact can be used to start manual- or interval time wash cycles.
Hold: Contact can be used to signal the Hold situation.
Fail: Contact S4 is programmed as fail-safe contact.
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Contact input
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Remote wash cycle start.
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Temperature compensation Function
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Automatic or manual. Compensation to Nernst equation. Process compensation by configurable temperature coefficient, NEN6411 for water or strong acids/bases or programmable matrix.
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Calibration
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Semi-automatic 1 or 2 point calibration using pre-configured NIST, US, DIN buffer tables 4, 7 & 9, or with user defined buffer tables, with automatic stability check. Manual adjustment to grab sample.
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Display
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Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and touch screen.
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Housing
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Cast Aluminum housing with chemically resistant coating; Polycarbonate cover with Polycarbonate flexible window, Protection IP66/NEMA 4X/CSA Type 3S
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Power supply
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PH450G-A:
Ratings; 100 to 240 V AC, Acceptable range; 90 to 264 V AC
Ratings; 50/60 Hz, Acceptable range; 50 Hz ±5%, 60 Hz ±5 %
Power Consumption; 15 VA
PH450G-D:
Ratings; 12 to 24 V DC, Acceptable range; 10.8 to 26.4 V DC
Power Consumption; 10 W
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Environment and operational conditions
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Ambient temperature: -20 to 55℃ (-5 to 130℉)
Storage temperature: -30 to 70℃ (-20 to 160℉)
Humidity: 10 to 90 % RH at 40℃ (100℉) (non-condensing)
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