Pfeiffer Vacuum ASM 340 - Internal Pirani Gauge Calibration; External Gauge

8.4.7 Internal Pirani gauge calibration
This function is used to calibrate the detector’s Pirani internal gauge.
Access: Menu [Maintenance] [Internal Pirani calibration]
Pressure Read only
Limit pressure or atmospheric pressure display depending on the procedural step.
● Pressure ≈ 5000 -> Limit pressure display
● Pressure ≈ 30000 -> Atmospheric pressure display
Inlet pressure Read only
Inlet pressure display.
HV valid Function launching
Setting the limit pressure (≈ 5000)
Hard Vacuum Displaying the limit pressure
Atm valid Function launching
Setting the atmospheric pressure (≈ 30000)
Atmospheric Displaying the atmospheric pressure
Start/Stop Function launching
Test start
Inlet vent Function launching
Prerequisites
●
Hard vacuum test method selected
●
Most sensitive test mode selected
●
Manual cycle end (= 'operator' selected).
Procedure
The calibration involves setting the limit pressure then the atmospheric pressure.
The pressures displayed at the different steps are indicated in the table below.
1. Implement the preliminary conditions.
2. Put the leak detector on ‘Stand-by’ mode (step 1).
3. Close the detector’s inlet with a blank-off flange.
4. Create an inlet vent: press [VENT].
5. Wait 5 minutes.
6. Press [Valid Atm] (step 2).
7. Start a test: press [Start] on the menu or the START/STOP button.
8. Wait 5 minutes for the measurement to stabilize (step 3).
9. Press [Valid HV] (step 4).
10. Start the test: press [Stop] on the menu or the START/STOP button.
Pressures displayed during the procedure
Pressures displayed at the different steps in the procedure
Step 1 Step 2 Step 3 Step 4
Pressure P
1
(≈ 30000)
P
1
(≈ 30000)
P
2
(≈ 5000)
P
2
(≈ 5000)
Inlet pressure
1 · 10
-3
1 · 10
-3
1 · 10
-3
1 · 10
-3
Limit pressure (HV) V
(≈ 5000)
V
(≈ 5000)
V
(≈ 5000)
P
2
(≈ 5000)
Atmospheric pressure (Atm) A
(≈ 30000)
P
1
(≈ 30000)
P
1
(≈ 30000)
P
1
(≈ 30000)
P: pressure value
V: limit pressure value (HV)
A: atmospheric pressure value (Atm)
8.4.8 External gauge
This function is used to manage the leak detector by an external gauge.
Settings menu
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