Touchscreen - Hach ORBISPHERE 51 Série Manuel D'utilisation Simplifié

4.6.5 Measurement alarm relays
The three output relays are located on the measurement board.
They can be individually configured to Normally Open (NO) or to Normally
Closed (NC) by physically moving the jumper on each relay. On the illustration:
• Upper relay is set to NC
• Middle relay is set to NO
• Lower relay is shown with no jumper
Note: J14 is relay 1, J18 is relay 2, J19 is relay 3
Note: The output relays are in alarm condition when the instrument power is set to off.
4.7 Sensor installation
4.7.1 Sensor positioning
The sensor must be installed in a socket or flow chamber that allows contact with the sample fluid to
be analyzed. The sensor and measuring instrument are connected by a cable. The standard sensor
cable lengths are 3, 5, 10, 15 and 20 meters. Ensure that the sensor will be mounted:
• perpendicular to the pipe
• on a horizontal pipe section (or on flow-ascending vertical pipe)
• minimum of 15 meters away from the pump's discharge side
• in a place where the sample flow is stable and rapid, and as far as possible from:
• valves
• pipe bends
• the suction side of any pumps
• a CO injection system or similar
2
Note: There may be situations where not all the above conditions can be met. If this is the case, or you have any
concerns, please consult your Hach representative to appraise the situation and define the best applicable solution.
Section 5 User interface
5.1 Instrument controls
The instrument front panel provides:
• A touch screen acting as display, touch pad and keyboard.
• A LED, showing when the instrument is on.
Turning instrument On and Off
There is no power switch on the instrument. The mains must be disconnected to turn the instrument
off.
Measurement window
The main (numeric) measurement window continuously displays:
• Sensor measured values
• Measured sensor trends (for the last 10 minute to last hour)
• Measured sensor data alarm limits and other events
• Temperature
5.2 Touch screen
The user interface on the front panel is a touch screen providing easy selection through menus. All
the measurement, configuration, calibration and standard service routines can be called by pressing
buttons and menu bars on screen.
14 English