LEYBOLD DeviceNet ITR 200 D - Object-Specific Services on Instance 2; Hot Cathode Ion Gauge

Object Structure
26
17200138_002_C0 – (2016-10) –
 Leybold
Parameter Data type The target value for the full scale calibration
Data Unit Counts mbar *) Pascal *) Torr *)
Target Value
INT 0x7918 0x03E8 0x7FFF 0x02ED
REAL 0x46F23000 0x447A0000 0x47C35000 0x443B83F3
*) Leybold recommends to use mbar, Torr or Pascal only with the data
type REAL.
Special limitations apply for INT:
The full scale value of the transmitter is 1000 mbar
≙ 10000 Pascal. But
the max. pressure of the transmitter can not be described using INT and
Pascal. The target value 0x7FFF (the maximum INT value) allows to
perform a Full Scale Adjust Service for the unit Pascal.
For the data type INT and pressure values below 1 (in the actual pres-
sure unit) you always get a pressure of zero.
2.4.5 Object-Specific Services on Instance 2 / Hot Cathode Ion
Gauge
2.4.5.1 Set Degas State
Service Code Service Name Description of Service
61
h
Set Degas State Activates/deactivates degas mode according to the
parameter Degas State. Degas mode may be terminated
either automatically by device timeout (3 min) or
remotely by this service.
Parameter Data type Semantics of Values
Degas
State
BOOL
0 switches Degas OFF
1 switches Degas ON
Degas is switched on only if the pressure is below 7.2×10
-6
mbar.
2.4.5.2 Set Emission State
Service Code Service Name Description of Service
62
h
Set Emission
State
Turns the filament on and off according to the parameter
Emission State
Parameter Data type Description Semantics of Values
Emission
State
BOOL
→ below
0 turns emission OFF
1 turns emission ON
If the transmitter is in the Emission User Mode “Manual”, please keep attention at
the following points:
The service SET EMISSION STATE  ON may be executed only, if the pressure
is below 2.4×10
-2
mbar. If the pressure is higher, an Object State Conflict error
message will be returned.
If the pressure rises above 3.2×10
-2
mbar, the transmitter will switch off the
emission automatically. The transmitter will then show the pirani value.
If the transmitter is measuring in the ion gauge measuring range and the service
Set Emission State  OFF ist executed, the emission will be switched off and the
minimum Pirani value 1E-3 will be displayed.
Full Scale Adjust Request
Service Data Field
Parameters
Set Degas State Request
Service Data Field
Parameters
Set Emission State Request
Service Data Field
Parameters