Hach-Lange ORBISPHERE 510_51x Basic User Manual - Manual (Page 22)

External pressure calibration (optional sensor)
Two point calibration (recommended)
1. Connect a certified absolute pressure gauge to the sample line, and use a certified precision
barometer.
2. The two point calibration starts with barometric pressure for the lower point. Expose the external
pressure sensor to the atmosphere.
3. Enter the barometric pressure read on the barometer in the upper window and validate P1.
4. Expose the external pressure sensor to line pressure, making sure it is exposed to the same
pressure as the certified absolute pressure gauge.
5. Enter the absolute pressure value read on the certified absolute pressure gauge in the lower box,
and validate P2.
Note: Any pressure can be used for P1 and P2, but for an accurate calibration P1 and P2 should be as different
as possible.
One point calibration
1. Connect a certified absolute pressure gauge to the sample line.
2. Expose the external pressure sensor to line pressure, making sure it is exposed to the same
pressure as the certified absolute pressure gauge.
3. Enter the absolute pressure value read on the certified absolute pressure gauge in the lower box,
and validate P1.
Note: Any pressure can be used for P1, but for one point it should be as close as possible to the sample
pressure.
Services menu
There are a number of options available from this menu with the key options detailed below.
Calibration timer
The instrument can automatically remind the user when the next sensor calibration is due. Select the
measurement channel, select Enable and enter a delay in days. The next calibration date is updated
when the sensor is calibrated.
Service timer
The instrument can automatically remind the user when the next sensor service is due. Select
Enable and enter a delay in days. The next service date is updated when the button Service done is
pressed after a service.
Language selection
Select the language from a list and restart the instrument to apply the change.
Clock
Update the time and date information.
Other menus
For information on setting up relays and analog outputs refer to the full user manual (Inputs/Outputs
menu).
For information on setting up RS485, PROFIBUS-DP, USB and HTTP/TCP-IP links refer to the full
user manual (Communications menu).
For information on setting up products and global configurations refer to the full user manual
(Products and Global Configuration menus).
22 English