Ashcroft 1036 Gauge with 1037 Fitting - Manual (Page 12)

ASHCROFT ® Previous Type 1009 Duralife ®
Calibration Procedure – Vacuum Range
1. Remove ring, window and gasket pointer.
2. Using a pencil, refer to dial and mark the 0 and
25˝ Hg positions on the case flange.
3. Remove dial.
4. Apply 25˝ Hg vac.
5. Lightly press pointer onto pinion carefully aligning it
with the 25˝ Hg vac. mark on the flange.
6. Release vacuum fully.
7. Note agreement of pointer to zero mark on flange.
8. If span is high or low, turn span block as shown in
Figure 1.
9. Repeat steps 4 through 8 until span is correct.
10. Remove pointer.
11. With 25˝ Hg vac applied, reassemble dial, dial screws
(finger tight) and point.
12. Apply 15˝ Hg vac. and note accuracy of indication.
If required, slide dial left or right to reduce error to 1%
maximum.
13. Firmly tighten dial screws.
14. Firmly tap pointer onto pinion.
15. recheck accuracy at 15 and 25˝ Hg vac. (Figure 2).
16. Reassemble window, gasket and ring.
Notes: See page 10 for any tools required to calibrate.
For model s pr oduced pr i or t o
Sept ember 2008 f or 2
1 ⁄
2
˝ ver si on and
December 2008 f or 3 1 ⁄
2
˝ ver si on.
Back of gauge will have a date code sticker.
© 2010 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M008-10077 9/01 AMR 05/10
0
25
Span Block
Decrease
7/64 Open
End Wrench
Increase
Pencil Marks on Case Flange
25
15
0
Figure 1 –
Figure 2 –
12