Type a number (with or without a decimal point) in the
Number
box, select the measurement
Units
,
and then click
Send
. The number entered and the indicator bar placement, should appear on your
instrument LCD.
Clock settings
Choose the
Clock settings
command to set the date and time in the instrument.
The first screen displays the current date and time as set in the instrument. If this is correct, choose
Ok
, else if either date or time must be changed, choose
Modify
to bring up the next screen. Enter
the current date and time and choose
Ok
to store the entry into the instrument. All measurements will
be noted with the appropriate date and time when they are downloaded to the Hach 3658 program.
Analog voltages view
The
Troubleshooting
,
Analog Voltage View
gives a real-time look at voltages used by the system
to transmit information about sensor current, temperature and pressure. This is useful when trying to
identify an instrument problem with a Hach Lange service representative either on-site or over the
phone.
When performing this test, if the system is over-range, you may receive a message that states, for
example,
The current input is saturated
. Similar messages will also appear, to warn when
temperature and pressure limits are exceeded.
The voltage limits for normal operation are:
• Current channel: +0.1 V and +4 V, depending on the gas being measured
• Temperature channel: +10 mV to +4 V
• Pressure channel: -100 mV to +100 mV
The
POINT
window on the right side of the gas channel voltage, is a parameter useful for
troubleshooting by Hach Lange support technicians. It cannot be set or updated locally.
Measurements view
The
Troubleshooting
,
Measurements View
confirms, on your PC monitor, what your instrument
should be displaying on the LCD for gas concentration and sample temperature. Choose
Cancel
to
exit from this display.
Troubleshooting - Operation
Program identification
In case of problems, it may be necessary to check the current version of your software as this may
be required by Hach Lange if you need to contact them for assistance in problem solving.
To identify the version of the software in your instrument, switch off the instrument. Then hold down
the
MEAS
button while switching the instrument back on. The instrument will then briefly display the
software version number before going through it’s start-up procedures.
Diagnostics messages
The following are warning messages that may appear on the instrument LCD in place of the gas
concentration.
Table 2 Diagnostic messages
Message Meaning
Pur
This message appears on the LCD if the purge gas supply fails. To detect this condition, the voltage
signal from the TC sensor is measured. This is normally between 1-3 volts, depending which gas is
being measured.
If the flow of purge gas stops, the sensor voltage wanders outside the permitted range of 100mV to
4 V. Refer to
Out
This message appears if the sensor is unplugged from its correct position, or if the temperature is
outside the range -5°C to 100°C.
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