Hach-Lange SI794 P User Manual - Manual (Page 99)

99
Max. pulse frequency * 0001 ... 0180 min-1
(pulse frequency controller)
Display LC display, 7-segment with icons
Main display Character height 17 mm, unit symbols 10 mm
Secondary display Character height 10 mm, unit symbols 7 mm
Sensoface 3 status indicators (friendly, neutral, sad face)
Mode indication 5 mode indicators “meas”, “cal”, “alarm”, “cleaning”, “config”
18 further icons for configuration and messages
Alarm indication Red LED in case of alarm or HOLD, user defined
Keypad 5 keys: [cal] [conf] [  ] [  ] [enter]
Service functions
Current source Current specifiable for output 1 and 2 (00.00 to 22.00 mA)
Manual controller Controller output entered directly (start of control process)
Device self-test Automatic memory test (RAM, FLASH, EEPROM)
Display test Display of all segments
Last error Display of last error occurred
Sensor monitor Display of direct, uncorrected sensor signal
(electrode)
Relay test Manual control of the four relay contacts
Parameter sets* Two selectable parameter sets for different applications
Data retention Parameters and calibration data > 10 years (EEPROM)
Protection against electric shock
Safe electrical isolation of all extra-low-voltage circuits
against mains by double insulation acc. to EN 61010-1
Power supply 24 (-15%) ... 230 V AC/DC (+10%); approx. 5 VA, 2.5 W
AC: 45 ... 65 Hz
Overvoltage category II, protection class II