Hach Ultrasonic flow sensor Manuel D'utilisation page 16

Clean the sensor
The sensor requires no routine maintenance other than the occasional
cleaning.
1. Use warm soapy water to clean the sensor.
2. Use clean water to rinse the sensor.
Troubleshooting
Intermittent data
During calibration, data is not sent to the datalog. Thus, the datalog can
have areas where the data is intermittent.
Inspect the sensor cable
D A N G E R
Electrocution Hazard. High voltage wiring for the controller is conducted behind
the high voltage barrier in the controller enclosure. The barrier must remain in
place except when installing modules, or when a qualified installation technician
is wiring for power, relays or analog and network cards.
W A R N I N G
Potential Electrocution Hazard. Always disconnect power to the
instrument when making electrical connections.
W A R N I N G
Potential Electrocution Hazard. Only qualified personnel should
conduct the tasks described in this section of the manual.
N O T I C E
Potential Instrument Damage. Delicate internal electronic components
can be damaged by static electricity, resulting in degraded
performance or eventual failure.
16 English
If a measurement problem exists, perform the following steps.
1. Inspect the sensor cable for physical damage.
2. If an interconnect cable is used, check the junction box.
a. Disconnect the cable at both ends (sensor and controller).
b. Use an ohmmeter to check the wires for continuity and internal
shorts.
Sensor diagnostic and test menu
The sensor diagnostic and test menu shows current and historical
information about the instrument. Refer to
description. To access the sensor diagnostic and test menu, push the
MENU key and select Sensor Setup, [Select Sensor], DIAG/TEST.
Table 4 Sensor DIAG/TEST menu
Option Description
MODULE INFORMATION Shows the version and the serial number for the
sensor module.
SENSOR INFORMATION Shows the name and serial number that was entered
by the user.
CAL DAYS Shows the number of days since the last calibration.
CAL HISTORY Shows a list of and details for each calibration.
RESET CAL HISTORY Resets the calibration history for the sensor
(requires service-level passcode). All previous
calibration data is lost.
SENSOR DATA Shows the number of days that the sensor has been
in operation and the current sensor signal reading in
ms.
RESET SENSOR Resets the number of days that the sensor has been
in operation and the calibration data to defaults.
Diagnostic/test menu