8.4 Gauge Test. Ohio Medical Pediatric ISU, ISU

8/Service Checkout Procedure

8.4 Gauge Test

Note: All Ohio Medical gauges are supplied with an accuracy of ±5% of full scale deflection throughout their range. The ISU vacuum gauges have an accuracy of:

Gauge Range Accuracy

0-200 mmHg (0-26.7 kPa) ± 10 mmHg (± 1.3 kPa)

0-760 mmHg (0-101.3 kPa) ± 38 mmHg (± 5.1 kPa)

0-160 mmHg (0-21.3 kPa) ± 8 mmHg (± 1.1 kPa)

Note: All gauge needles should return to the stop pin when no suction is being supplied. Gauges which do not comply may be out of calibration.

When checking gauge accuracy, be sure that the calibration gauge has an accuracy of 1% of full scale deflection or better.

1. Connect the regulator fitting port to the low vacuum calibration gauge with tubing.

2. Turn the mode selector knob to | (CONT).

3. Ensure that the regulator gauge is in agreement with the low vacuum calibration gauge within the tolerances listed above. Recommended test points are:

Adult ISU: 40, 80, 140 and 200 mmHg (5.3,

10.7, 18.7 and 26.7 kPa)

Pediatric ISU: 40, 80 and 120 mmHg (5.3,

10.7, and 16.0 kPa)

4. Adult ISU ONLY - Rotate the suction control knob fully clockwise (increase) and verify the gauge’s reading is in the FULL VAC range.

5. Rotate the suction control knob fully counterclockwise (decrease) and verify the gauge’s reading decreases to zero.

8.6 Timing Cycle Adjustment

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WARNING: If the screws on the timing valves are turned all the way clockwise, the ISU and the Pediatric ISU will not cycle.

Factory Settings:

“On” Cycle: 15 seconds ± 3 seconds

“Off” Cycle: 8 seconds ± 3 seconds

To set the timing cycles, perform the following procedure.

1. Occlude the fitting port.

2. Turn the selector mode knob to | (CONT).

3. Set 120 mmHg (16.0 kPa) on the regulator gauge.

4. Turn the mode selector knob to |O|O| (INTER) with the fitting port still occluded.

5. Wait 20 seconds.

6. If the regulator does not cycle “On,” use a flat-head screwdriver to rotate the “Off” timing valve stem counter-clockwise until the regulator cycles “On.”

7. Wait 20 seconds.

8. If the regulator does not cycle “Off,” use a flat-head screwdriver to rotate the “On” timing valve stem counter-clockwise until the regulator cycles “Off.”

9. Once the regulator has completed an “On” and

“Off” cycle, fine tune each cycle to the desired time by adjusting the corresponding valve. To increase the time, turn the timing valve stem clockwise.

To decrease the time, turn the timing valve stem counter-clockwise.

10. Use Ohio Medical VACUTIMER (P/N 6700-0428-

800) to digitally adjust timing cycles.

8.5 Regulation Test

1. Disconnect the low vacuum calibration gauge from the regulator fitting port.

2. Occlude the fitting port.

3. Set 90 mmHg (12.0 kPa) on the regulator gauge.

4. Open and close the fitting port several times.

5. Check that the regulator gauge reads between:

Adult ISU: 80 mmHg (10.7 kPa) and 100 mmHg

(13.3 kPa) when the regulator fitting port is occluded.

Pediatric ISU: 82 mmHg (10.9 kPa) and 98 mmHg (13.1 kPa) when the regulator fitting port is occluded.

Timing valve stem

Flow Control valve access

Nameplate wrench

Setting the Timing Cycles and Intermittent Mode Flow Rate

6700-0082-000 (Rev.4) 10/2012 21