Hach ORBISPHERE ATEX 366 Série Manuel D'utilisation Simplifié page 29

8.3 Display test
Choose the Display test command to verify the LCD display on the instrument. Type a number, with
or without decimal point, in the number box, and select the measurement units to be displayed. Click
on Send to transmit this test to the instrument. The number entered, and indicator bar placement,
should appear on the instrument LCD display.
8.4 Alarms test
When connecting the alarm outputs to user-supplied equipment, it may be helpful to verify the
connections with a test signal. Choose Low Alarm, High Alarm, or system alarm to test the relays,
then click Activate. The selected relay is activated and the associated contacts provide a test output.
Choose None, then click on Activate to verify that the alarm contacts are set for "No alarm" condition.
Click Cancel to reset any relay activated and exit from this test box.
8.5 Analog output test
Choose the Analog Output Test to test the analog output of the instrument. When this command is
selected, an output test may be performed at the instrument analog output connections. Choose
0/4 mA, 10/12 mA, or 20 mA to select the analog level for the output test. Then click on Activate to
apply the selected current to the analog output connection.
8.6 Clock settings
Choose the Clock Settings to set the instrument's date and time. The first screen displays the current
date and time. If this is correct, choose OK; if either date or time must be changed, choose Modify.
Enter the current date and time, and click OK to store the new data. All measurements will be saved
with this date and time when they are downloaded in the ATEX 3660 software.
8.7 Analog input test
The signal received from the gas sensor, corresponding to the measured gas concentration, is
amplified by the instrument. The system automatically selects the best amplification range according
to conditions (Auto range function). Amplification ranges from 0 (low amplification for high gas
concentration) to 3 (high amplification for low gas concentration).
Note: The Range box shows the signal amplification that is currently applied to the gas concentration signal.
This test shows the amplified signals received from the sensors in Volts. This test is used when trying
to define an instrument or a sensor problem. Amplified signals on display are:
• Current (gas concentration)
• Temperature
• Pressure
When performing this test, the system will send a warning message when current, temperature, or
pressure limits are exceeded. The limits of the voltages for normal operation are:
• Current channel: 0 V to + 1.5 V
• Temperature channel: + 10 mV to + 4 V
• Pressure channel: 0 mV to + 100 mV
8.8 Measurements view
Choose the Measurements View command to confirm what the instrument is displaying on the LCD
display.
8.9 Sensor current view
Choose the Sensor Current View command to monitor the sensor current, in real time.
English 29