Replacing Check Valves; Purion Cone Cleaning - Teledyne ACCQPrep HP125 Installation And Operation Manual

Table of Contents

ACCQPrep HP125

Section 6 Maintenance

Figure 6-34 Check valve holder

6.8.7 Replacing Check Valves

Figure 6-35 Correct orientation of cartridge

6-24

2. Remove check valves from pump head and place in a bea-

ker of methanol. Sonicate check valves for 15 to 20 min-

utes.

3. Reinstall check valves into pump head making sure that

the ends of the check valves (with multiple holes) are fac-

ing up towards the outlet of the pump.

4. Reinstall check valve holders and tighten finger tight.

Then using pliers tighten an additional ¼ turn.

5. Check the flow rate delivery. If the flow rate delivery is still

incorrect, replace the check valves. The correct flow rate

depends on the back pressure of the carrier solvent. The

flow will be 0.5 mL/minute until the fluid interface reaches

operating pressure, then reduces the flow rate to 0.2

mL/minute under typical operating conditions for the fluid

interface. The operating mode can be determined by listen-

ing to the pump operate. While running at 50 mL/min, the

pump motor speed is continuous. Once operating pressure

is reached, the pump has a rapid refill stroke approxi-

mately that occurs ~ 8 seconds.

1. Install new check valve cartridges (P/N: 250-0001-17) into

pump head housing making sure the ends of the cartridges,

with three small holes, are facing upwards towards the

outlet (Figure 6-35).

2. Tighten check valve holders finger tight, then with pliers

tighten an additional ¼ turn.

This error occurs if the capillary inlet to the PurIon vacuum

region is restricted causing a higher vacuum reading than

normal. The PurIon S & L models compatible with the NextGen

Table of Contents