توضیحات
| Measuring principle | Electrochemical |
|---|---|
| Input ranges | pH: -2 to 16 pH ORP: -1500 to 1500 mV rH: 0 to 100 rH Temperature: -30 to 140 deg C (Pt1000) |
| Transmission signals | General: Two isolated outputs of 4 to 20 mA DC with common negative. Maximum load 600 Ω. Bi-directional HART® digital communication, superimposed on mA1 (4 to 20 mA) 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 (21.0 mA) or burn down (3.6 mA) to signal failure accorded with NAMUR NE43. Hold: The mA-outputs are frozen to the last/fixed value during calibration/commissioning. |
| Contact outputs | 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. |
| Contact input | Remote wash cycle start. |
| Temperature compensation Function | Automatic or manual. Compensation to Nernst equation. Process compensation by configurable temperature coefficient, NEN6411 for water or strong acids/bases or programmable matrix. |
| Calibration | 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. |
| Display | Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and touch screen. |
| Housing | Cast Aluminum housing with chemically resistant coating; Polycarbonate cover with Polycarbonate flexible window, Protection IP66/NEMA 4X/CSA Type 3S |
| Power supply | PH450G-A: Ratings; 100 to 240 V AC, Acceptable range; 90 to 264 V AC Ratings; 50/60 Hz, Acceptable range; 50 Hz ±۵%, ۶۰ Hz ±۵ % 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 |
| Environment and operational conditions | Ambient temperature: -20 to 55℃ (-۵ to 130℉) Storage temperature: -30 to 70℃ (-۲۰ to 160℉) Humidity: 10 to 90 % RH at 40℃ (۱۰۰℉) (non-condensing) |
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