| Configurations |
C820: 1 Conductivity sensor (optek ACF, ACS), 3 mA outputs
C821: 1 Conductivity sensor (optek ACF, ACS), 1 analog pH electrode, 6 mA outputs
C822: 2 Conductivity sensors (optek ACF, ACS), 6 mA outputs
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| Housing |
Front panel mounting in control cabinets
Dimensions front: 110 x 110 mm (4.33 x 4.33 in.)
Cut-out dimensions: H 92 mm (3.62 in.) W 92 mm (3.62 in.) D 130 mm (5.12 in.)
Material: stainless steel / polyester / ABS / PUR-foam
Protection: front IP66 / rear IP20 (mains supply secured against accidental touching)
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| Display |
3.5″ LCD graphic display (320 x 240 pixel), Monochrome display
Backlight: LED (white)
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| Operation |
membrane keyboard (navigation keys) Software based menu operation
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| LED |
1 LED (green):power on
1 LED (red-flashing):system failure
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| mA-outputs |
up to six 0/4 to 20 mA (NAMUR)
functionally galvanically isolated (min. 500 V DC) for connection to SELV / PELV
accuracy: < 0.5%
resolution: < 0.05%
load: < 500 Ohm
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| Digital outputs |
2 x (NC/NO)
Min. switching voltage: 5 V DC
Max. switching voltage: 30 V DC
Max. switching current: 500 mA
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| USB interface |
USB type C interface (frontside) for data exchange (copy of parameter sets, firmware update, eventlogger read-out)
File system format: FAT32
Storage medium: USB-C stick (not included in delivery)
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| Conductivity inputs |
Inputs for one or two optek conductivity sensors ACF/ACS series
measuring range: 0- 10 µS/cm to 850 mS/cm (depending on optek ACx sensor connected)
resolution: 0.001 µS/cm
integrated temperature sensor: Pt1000 (RTD)
accuracy: ±0.25 °C at 25 °C (77 °F)
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| pH input (only variant C821x) |
Input for one pH electrode, model C821
measuring range 0 – 14 pH
accuracy: ±0.01 pH
resolution: 0.01 pH
resolution Pt1000: 0.04 K
resolution Pt100: 0.4 K
diagnosis: glass impedance, diaphragm breakthrough
measurement response time:
- diagnostics enabled: < 3 s
- diagnostics disabled: < 1 s
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Cable lengths
(sensor) |
2, 3, 5, 10, 15, 20, 30 m
(7, 10, 16, 33, 49, 66, 98 ft)
max. cable length at pH depends on the pH electrode
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| Power supply (fixed, secured against accidental touching) |
Nominal voltage : 24 V DC
Input voltage range : 19.6 V DC to 30 V DC
Voltage supply tolerance during operation : ± 20
Power consumption maximum : 13 W
Inrush current (< 0.5 ms) : 16 A
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| Ambient conditions |
Temperature during operation (no direct sunlight):
– converter: -10 to 55 °C (14 to 131 °F)
Temperature during transport (no direct sunlight): -20 to 70 °C (-4 to 158 °F)
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| Software languages |
English, German, French, Spanish, Russian, Portuguese, Chinese, Japanese, Korean
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