Control device for system leakage test DSLC px Vx Dungs
- These valve proving systems DSLC px Vx are suitable for automatic leakage tests between two solenoid valves in gas-consuming devices.
- Together with one or two gas pressure switches, the DSLC control device built according to EN 1643 for system leakage tests checks the burner gas shut-off valves for leakage
- A synchronous gear motor with control cams controls the DSLC program sequence via microswitches.
- The testing system can be used alone for leakage tests or combined with all types of automatic burner control systems.
- Test volume: min. 1,5 l.
Technical specifications
| Valve proving system type | Code | Nominal voltage (V) | Frequency (Hz) | Degree of protection | Ambient temperature (oC) | Test cycle (s) | Test time V1 (s) | Test time V2 (s) |
|---|---|---|---|---|---|---|---|---|
| DSLC px Vx 230V Kpl. | 247962 | 230 | 50 | IP 42 | 0÷60 | approx. 60 | min. 22 | min. 20 |
| DSLC px Vx 110V Kpl. | 248762 | 110 | 50 | |||||
| DSLC px Vx 24V DC Kpl. | 247963 | 24 | DC | |||||
| DSLC px Vx 24V DC Kpl. | 265281 | 24 | DC |
Dimensions leakage test system (mm)
For the images that aren't clear move the mouse over them to zoom.
Functional description shown with 1 pressure switch
The section from valve seat V1 to valve seat V2 is called "test section". The DSLC performs a test before every burner start-up, i.e. when heat is requested by the controller or after the unit is
switched off due to loss of mains voltage, gas shortage etc. The test consists of two phases:
1) Test of the valve (V1) on the gas inlet side
When heat is required, the controller circuit is closed, and the DSLC receives voltage and starts the test cycle (approx. 60 seconds).
At the beginning of the first phase (figure 1a), valve V2 is opened for max. 3 seconds. The pressure in the test section must drop to atmospheric pressure, i.e., the pressure switch Pp must
switch back after the pressure is relieved. If it is not possible to evacuate the test section, the pressure is relieved again after 60 seconds.
During the subsequent test time (figure 1b) the pressure built up in the test section must not exceed the switch point of pressure switch Pp. However, if this happens due to leakage in
solenoid valve 1, the DSLC takes the fault position and prevents the burner from being started. The red fault display lights up. There is voltage at terminal 5 of the device for teleindication of the fault.
2) Test of the valve (V2) on the burner side
The DSLC opens valve V1 for max 3 seconds before the second test phase (figure 2a). Thus, the test section is under gas pressure, and the second test phase begins.
During the subsequent test time (figure 2b) the pressure in the test section must not drop below the switch point of the pressure switch Pp. However, if the pressure falls due to leakage
in valve V2, the pressure switch Pp reports this and the DSLC is locked in the fault position. All parts lying in the test section, such as pressure switches, pipes, screw joints etc., are
simultaneously tested for leakage. Only after the second test phase, too, shows that all parts are "properly sealed", the DSLC through-connects the controller circuit (voltage at terminal 15) and
enables the program sequence for starting up the burner.
Program flowchart DSLC px Vx:
Schematic diagrams:
1) Valve test with auxiliary valves V3, LGV
2) Valve test with auxiliary valves V3, V4
3) Direct valve test V1 with auxiliary valve V4 or LGV
4) Direct valve test V1, V2
| Legend | ||||
|---|---|---|---|---|
| V1 | Safety solenoid valve | V4 | Discharge solenoid valve | |
| V2 | Burner solenoid valve | LGV | Leakage gas solenoid valve | |
| V3 | Filing gas solenoid valve | Pp | Test pressure switch | |
DSLC display of valves
- Example 1 V1 (blue) large leak
- Example 2 V2 (red) medium leak
- Example 3 V2 (red) small leak
The qualitative differentiation between small, medium and large is used for fault analysis only. However, the valves must always be regarded as leaky!
Prices
| Code | Type | Prices without VAT |
|---|---|---|
| 247962 | DSLC px Vx 230 V Kpl. | 0.00 |
| 248762 | DSLC px Vx 110 V Kpl. | 0.00 |
| 247963 | DSLC px Vx 24 V DC Kpl. | 0.00 |
| 265281 | DSLC px Vx 24 V DC Kpl. | 0.00 |
In case the price is missing or for a list of discounts contact
us directly to receive an offer.