Level Meters
The Level Meter object class is for devices that are mounted on a vessel that are used to measure various things regarding the contents of the dewar, which is usually liquid Helium.
The Level meter class has a position type of 2.
| Status | Meaning |
|---|---|
| 0 | inactive |
| 1 | connecting |
| 2 | connected |
| 3 | fill begin |
| 4 | filling |
| 5 | timeout |
| 6 | |
| 7 | req. meas. |
Example of a level meter:
Helium content is measured in liquid litres (meaning amount of Helium gas equivalent to that volume of Helium liquid).
| Measurement number | Parameter being measured | Unit |
|---|---|---|
| 1 | Level | percentage |
| 2 | Pressure | mbar |
| 3 | Battery | percentage |
| 4 | Battery Temperature | K |
| 5 | Helium content | litres |
| 6 | Measured resistance of probe | Ohm |
By default, the Level Meter object class has one object type, called Level meter default.
| Attribute | Type | Note |
|---|---|---|
| OB_ID | Integer | |
| OB_OBJECTTYPE_ID | Integer | 13 |
| OB_NAME | String | |
| OB_ADDRESS | String | XBee address |
| OB_COMMENT | String | |
| OB_POSINFORMATION | String | |
| OB_STATUS | Integer | currently not used? |
| OB_LASTTIMEACTIVE | TDateTime | |
| OB_OUTOFOPERATION | boolean | |
| OB_ACTIVE | boolean | |
| OB_MINVALUE | double | battery in Volt |
| OB_MAXVALUE | double | battery in Volt |
| OB_CRITVALUE | double | battery in % |
| OB_INSTALLED | TDateTime | |
| OB_SERNO | String |