Hach ORBISPHERE 410, Руководство пользователя, Страница: 45 / 98

44
Measurement Menu
6.1 Instrument configuration
6.2 Measurement configuration
Continuous mode description
Continuous mode is typically used for process measurement.
Continuous mode cycle
•
Every 2 sec. measurements are refreshed on the display
•
The relays and the analog outputs are updated
•
Measurements are continuously stored in memory (volatile and non volatile memory) according to
individual settings
Measurement mode is locked on
Continuous
for on line process. Select the units for barometric
pressure and temperature.
EC sensor
•
Sensor’s membrane number selection
• Medium
: Liquid or gas phase.
• Gas unit type
: Partial, Fraction, Dissolved.
• Gas unit
: The list of available units depends on unit type selected above.
Note:
This is the gas concentration measured by the EC sensor. When a composite unit is selected (e.g.
ppm-ppb) the unit will change depending on the range of the value to display.
• Liquid
: When medium is liquid, select water or a liquid with a different solubility (if available).
• Display resolution
: Maximum resolution depends on gas, membrane and unit. A maximum of 5
digits can be displayed. Decimals can be limited to 0, 1, 2 or 3 decimals for easier reading. That does
not affect the actual resolution of data measured and stored, but only the data displayed.
• Thermal cutoff
: To protect the sensor, the thermal cutoff function allows for setting a sample high
temperature limit. If exceeded (during a Cleaning In Place cycle for example) the electrical signal to
the sensor is cut off, the measurement session is suspended and the system displays a “HOT” alarm
message. The system resumes when temperature drops to 90% of the specified cutoff temperature.
• Thermal cut off options
: Disabled / enabled.
• Thermal cut off temperature
: To be set according to conditions.
TC sensor
The measurement configuration for a TC sensor is the same as for an EC sensor with the addition of one
extra selection criteria:
• Purge gas
: From the drop-down list, select the purge gas being used for the TC sensor.