Martel Electronics MECP Operating Manual

www.martelcorp.com

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Martel Electronics

PO Box 770

1F Commons Drive

Londonderry, NH 03053

Rev C 12/20/2005 P/N 0280257

MECP500

Pneumatic Hand Pump

Operating Instructions

The MECP500 Pneumatic Hand Pump is a compact, lightweight,
portable, hand-operated pressure and vacuum pump. When a digital
calibrator is added the unit can be used to calibrate or check
pressure measuring devices in the field. No external power or high
pressure bottles are required. The MECP500 is completely
assembled and ready to connect to the pressure device to be
calibrated. Calibration is quick and simple since the pump is taken
directly to the pressure device. This pneumatic pump provides a
source of air pressure, 0-500 psig (600 psi max.), or vacuum,
0-28" Hg.

1. Isolate the device to be calibrated. CAUTION: Do not connect

to high pressure sources. Safe operating procedures must be

exercised to avoid personal injury and damage to the
calibration system.

2. Connect the pump and calibrator to the pressure device to be
calibrated. Make sure the connection is pressure tight and be
certain to use Teflon tape to prevent leakage.

3. Turn the knurled knob on the needle valve clockwise to close.

NOTE: Hand tighten only to prevent damage to the valve seat.

4. Using a small screwdriver, set the shuttle valve to "pressure or
vacuum". Note that "P" and "V" are stamped on the sides of the
pump body.

5. Operate the pump handles several times and recheck for
contamination.

6. Clean the o-ring assembly and the o-ring on the retention caps
with IPA and inspect the o-rings closely for any damage or
excessive wear. Replacements are included in the repair kit, if
needed.

7. Inspect the springs for wear or loss of tension. They should be
approximately 8.6 mm long in the relaxed state. If shorter, they
may not provide sufficient sealing tension. Replace if needed.

8. Once all parts have been cleaned and inspected, reinstall the
o-ring and spring assembly into the valve body.

9. Reinstall the retention caps and gently tighten each cap.

10. Seal the output port and operate the pump to at least 50% of

capacity.

11. Release the pressure and repeat several times to ensure that

the o-rings seat properly.

WARRANTY

Martel Electronics Corporation warrants the MECP500 pneumatic
pump against defects in materials and workmanship for a period of
twelve (12) months after date of sale. An invoice may be required as
proof of purchase for warranty claims. Damage due to
contamination or other misuse is not covered under this warranty.

If any product is to be returned, a “Return Material Authorization”
number may be obtained by calling our Customer Service
Department toll free at 1-800-821-0023 in the US or Canada or
[phone] outside the US. Access our RMA Form by using
www.martelcorp.com, under Customer Service.

5. Squeeze the handles until the desired or approximate pressure
is obtained. Additional force is required as the pressure is
increased.

6. The pressure can be decreased with the needle valve.

7. The pressure can be "fine tuned" with the vernier knob. To
increase pressure, turn the vernier knob clockwise. Turning the
vernier knob counterclockwise will decrease pressure. NOTE:

The vacuum reading increases when the vernier knob is
turned counterclockwise.

8. When the calibration procedure is completed, bleed the
pressure before disconnecting the unit.

CAUTION: To prevent
personal injury, the pressure must be reduced to zero before
disconnecting any element of the system.

9. Store the unit in a carrying case or other safe location.

Pump Valve Assembly Cleaning Instructions

Occasionally, the MECP500 may not work properly due to dirt or
other contamination of the internal valve assembly. Use the following
procedure for cleaning the valve assembly. If this procedure does
not fix the problem, a repair kit (part number 1010043) may be
ordered.

1. Using a small screwdriver, remove the 2 valve retention caps
located on opposite sides of the pump below the
pressure/vacuum switch.

2. After the caps have been removed, gently remove the spring
and o-ring assembly.

3. Set aside the valve assemblies in a safe area and clean out the
valve body using a cotton swab soaked in IPA (isopropyl
alcohol).

4. Repeat the process several times using a new cotton swab
each time until there is no remaining evidence of contamination
or dirt.