Ralston QTCM Calibration Manifold User Manual

(QTCM, QSCM) Calibration Manifold
User Manual

For all models of Ralston Calibration Manifolds

Specifications

QTCM

H: 3.78 in (9.60 cm)
D: 2.63 in (6.68 cm)

QSCM

H: 3.78 in (9.60 cm)
D: 2.63 in (6.68 cm)

Requirements

What you need to use your Calibration Manifold:

1. Compressed Gas
2. Wrench
3. Ralston Quick-test™ Adapters
4. Pressure Reference
5. Device Under Test
6. Thread Tape
7. Ralston Quick-test™ Hose

Important Safety Notices

Important Safety Notices
WARNING: Do not exceed Maximum Working Pressure for this product or damage may result.
WARNING: Device under test should be isolated from the process, vented and vent valve closed prior to use.
WARNING: Do not attempt to operate this product until you have read and fully understand the instructions and hazards of the product.

• Any modifications to this product with custom parts can result in hazardous operation of the product.
• Use eye protection while using this product. Leaking gas, parts or hoses can be ejected at high speed and may cause injury.

Calibration Manifold Overview

1. Fill Port
2. Outlet Port 1
3. Manifold Body
4. Bleed/Vent Valve
5. Outlet Port 2
6. Fill Valve
7. Fine Adjustment Piston

Setting Up

Connecting Reference Gauge

Male NPT Reference Gauge

1. Reference Gauge with NPT male connection
2. NPT Female Ralston Quick-test™ Gauge Adapter NPT Female Ralston Quick-test™ Gauge
3. Ralston Quick-test™ Hose
4. NPT Female Ralston Quick-test™ Adapter

Male BSPP Reference Gauge

1. Reference Gauge with BSPP male connection BSPP Female R Quick-test™ A
2. BSPP Washer
3. BSPP Female Ralston Quick-test™ Adapter
4. Ralston Quick-test™ Hose
5. BSPP Female (RG) Ralston Quick-test™ Adapter

Female NPT Pressure Reference Gauge

1. Reference Gauge with NPT female port
2. NPT Male Ralston Quickest™ Gauge Adapter NPT Male Ralston Quick™ Gauge Adapter
3. Ralston Quick-test™ Hose
4. NPT Male Ralston Quick-test™ Adapter

Connecting Device Under Test (DUT)

1. Isolate the Device Under Test (DUT) from the process and vent DUT prior to connecting to it.
2. Close Bleed Valve and Fill Valve.

1. Pressure source
2. Ralston Quick-test™ Hoses
3. Device under test (DUT)

Calibration

Pressurize System

1. Open Pressure Source.* ralstoninst.com/pressure-regulators
2. Turn Pressure Regulator Valve clockwise.

Increase Pressure

1. Open Fill Valve.
2. Close Fill Valve below Test Point.
3. Fine-adjust to exact test point.

Repeat steps 1 through 3 for each test point up-scale

Decrease Pressure

1. Open Bleed Valve.
2. Close Bleed Valve just above test point.
3. Fine-adjust to exact test point.

Venting System

Vent system when calibration is completed.

Storage and Transport

Vent system when calibration is completed. See page 18.

1. Close Pressure Source.
2. Turn Pressure Regulator Valve counterclockwise.

Maintenance

Maintenance Interval
Every 300 uses or 3 months
Maintenance Procedure

• Lubricate the Ralston Quick-test™ fittings by squirting 2 ml of oil inside the connection.
• Lubricate the fine adjust piston O-rings with silicone lubricant.
• Lubricate the threads on the valves and fine adjust piston with a graphite based grease, such as Dow Corning® G-n Metal Assembly Paste (or equivalent).

Troubleshooting

There is a drop in system pressure when the Calibration Manifold has been pressurized and the Fill Valve is closed.
If there is a drop in system pressure when the Calibration Manifold has been pressurized and the Fill Valve is closed, then there is a leak. Follow these instructions to locate and repair the leak:

1. Connect the Calibration Manifold to a Device Under Test (DUT) and connect a Ralston Quick-test hose to the Inlet Port.
2. Make sure the process connections are assembled wrench-tight.
3. Close Vent Valve.
4. Open Fill Valve.
5. Apply Pressure to unit.
6. Close Fill Valve.
7. Spray soapy water or leak detection fluid where leaks are suspected or immerse the Calibration Manifold in water. Be careful not to immerse the pressure gauge or calibrator.
8. Observe where bubbles are coming from to determine where there is a leak.
9. Remove the leaking part and remove the O-ring.
10. Clean and lubricate the leaking O-ring, and backup ring with silicone grease if applicable.
11. Replace the O-ring, and backup ring if applicable.
12. Reassemble.

Fine Adjust Piston is difficult to operate.
If the Fine Adjust Piston is difficult to operate over years of service, then the inside walls of the piston need grease. Follow these instructions:

1. Remove the Fine Adjust Piston.
2. Apply a thin coat of graphite grease, such as Dow Corning® G-n Metal Assembly Paste (or equivalent) to the inside walls of the fine adjust body and the threads.
3. Lubricate the fine adjust piston O-rings with silicone lubricant
4. Reassemble.

The unit is leaking.
If the unit is leaking, then follow these instructions to locate and repair the leak:

1. Spray soapy water or leak detection fluid where leaks are suspected or immerse the Calibration Manifold in water. Be careful not to immerse the pressure gauge or calibrator.

2. If leak is around the fill valve or the bleed-off valve, then follow these instructions:
   a. Remove the fill valve and/or the bleed-off valve.
   b. Replace the leaking part.
   c. Reassemble.

3. If the leak is around the vernier piston, then follow these instructions:
   a. Remove the vernier piston, O-ring and backup ring.
   b. Inspect the O-ring and backup ring for damage.
   c. Clean, lubricate and replace the leaking O-ring and backup ring.
   d. Reassemble.

4. If the leak is coming from one of the inlet or outlet fittings, then follow these instructions:
   a. Remove the fitting.
   b. If external leak then remove and replace external o-ring.
   c. If internal leak then lubricate internal o-ring.
   d. Reassemble.

The unit is difficult to use (i.e. valves don’t shut off).
If the unit is difficult to use (i.e. valves don’t shut off), then replace the fill or bleed-off valve.
If the issue was not resolved by these troubleshooting instructions, then please contact support listed on page 37.

Support

https://ralstoninst.com/support

Calibration Manifold (QTCM, QSCM)

For all models of Ralston Calibration Manifolds

8.610.7664
www.calcert.com
sales@calcert.com

References

• Quick Test Point Adapters, Valves and Fittings
• Pressure Regulators | Ralston Calibration Instruments
• Calcert

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