Specifications

Dekker Vacuum Technologies, Inc. – DuraVane/12 16
Vacuum pump ON/OFF settings for Microprocessing Controller (Vacuum in “Hg):
When setting the ON and OFF switch points in your Controller, use the following table for
reference:
Inches of HgV
PLC Setting
29
234
28
488
27
742
26
996
25
1250
24
1504
23
1758
22
2012
21
2266
20
2520
19
2775
18
3028
17
3282
16
3536
15
3790
14
4044
13
4298
12
4552
11
4806
10
5060
This table will apply to all single and multiplex systems equipped with a Controller after 5/15/02 (all
units supplied with a Controller prior to this date must contact the Service or Engineering
department with serial number of supplied equipment for assistance). These values are entered
directly into the Controller in the appropriate block number for lead and lag pumps. Refer to the
specific instruction set provided with the IOM for block number identification.
- The correct value can also be determined by the following formula:
7600 – (Inches of HgV x 254) = Controller setting
Example: SW = 3282 – switch pump on at 17”HgV (7600 – (17 x 254) = 3282)
SW = 2520 – switch pump off at 20”HgV (7600 – (20 x 254) = 2520)
- To determine the vacuum point displayed on the LED of the Controller unit use the following
formula: “HgV = 29.92 – (Displayed Value/254)
Please note that the values you are working with are Torr values multiplied by 10.
A perfect vacuum is approaching a setting of 0 and at atmospheric pressure at sea-level the
setting is at 7600 (760 Torr x 10).
Settings for Simplex Systems:
- Unless otherwise noted, the standard switch points for a Simplex System will be set at:
Lead pump ON at 17”HgV – OFF at 20”HgV
- Specific block numbers for Simplex Controller Program:
Lead pump =B15
Setting for Duplex Systems:
- Unless otherwise noted, the standard switch points for a Duplex System will be set at:
Lead pump ON at 17”HgV – OFF at 20”HgV
Lag pump ON at 16”HgV – OFF at 19”HgV
- Specific block numbers for Duplex Controller Program:
Lead pump =B15
Lag pump =B16
Alarm visual/audible =B13 (Typically set to come on and off with lag pump settings)
Setting for Triplex Systems:
- Unless otherwise noted, the standard switch points for a Triplex System will be set at:
Lead pump ON at 17”HgV – OFF at 20”HgV
Mid pump ON at 16”HgV – OFF at 19”HgV
Lag pump ON at 15”HgV – OFF at 18”HgV
- Specific Block number for Triplex Controller Program:
Lead Pump =B15
Mid pump =B16
Lag pump =B23
Alarm visual/audible =B13 (Typically set to come on and off with lag pump settings)