135
Valves
Kits
Part No. Description
RheBuild kits for MX Series II
™
Valves
7150-999 RheBuild Kit for MXT715-000
7152-999 RheBuild Kit for MXT715-102
7155-999 RheBuild Kit for MXT715-105
7920-999 RheBuild Kit for MXP7920-000 and MXP7900-000
7960-999 RheBuild Kit for MXP9960-000
7961-999 RheBuild Kit for MXP7960-000
7970-999 RheBuild Kit for MXP7970-000
79801-999 RheBuild Kit for MXP7980-000
79861-999 RheBuild Kit for MXP7986-000
7900-999 RheBuild Kit for MXP9900-000
RheBuild kits for manual valves
3725-999 RheBuild Kit for models 3725, 3725i, 3725-038, 3735i-038
7010-996 Conversion Kit including Stator Face Assembly for model 7010
7010-997 RheBuild Kit including Stator for model 7010
7010-999 RheBuild Kit for model 7010 and 7010-type Valves
7125-999 RheBuild Kit for models 7125 and 7126
7125Ti-999 RheBuild Kit for model 7125-081
7410-999 RheBuild Kit for model 7410
7520-999 RheBuild Kit for models 7520 and 7526
7725-999 RheBuild Kit for models 7725 and 7725i
8125-999 RheBuild Kit for models 8125 and 8126
9010-999 RheBuild Kit for model 9010
9125-999 RheBuild Kit for models 9125 and 9126
9725-999 RheBuild Kit for models 9725 and 9725i
RHEBUILD KITS FOR MX SERIES I
™
VALVES
7900-999 RheBuild Kit for models MX7900-000, MX7925-000,
MX9900-000, MX9925-000
7960-999 RheBuild Kit for model MX7960-000
7980-999 RheBuild Kit for model MX7980-000
7984-999 RheBuild Kit for model MX7984-000
7986-999 RheBuild Kit for model MX7986-000
RheBuild Kits for LabPRO
™
& EV Automated Fluidic Instruments
1001-999 RheBuild Kit for model PR100-101
1005-999 RheBuild Kit for model PR/EV100-105
1006-999 RheBuild Kit for model PR/EV100-106
5001-999 RheBuild Kit for models PR/EV500-101 and PR/EV550-101
5100-999 RheBuild Kit for models PR/EV500-100 and PR/EV550-100
5104-999 RheBuild Kit for models PR/EV500-104 and PR/EV550-104
7004-999 RheBuild Kit for models PR/EV700-104 and PR/EV750-104
7112-999 RheBuild Kit for models PR/EV700-112 and PR/EV750-112
7501-999 RheBuild Kit for models PR/EV700-100 and PR/EV750-100
7502-999 RheBuild Kit for models PR/EV700-102 and PR/EV750-102
7507-999 RheBuild Kit for models PR/EV700-107 and PR/EV750-107
7531-999 RheBuild Kit for models PR703-100 and PR753-100
RheBuild
®
Kits
RheBuild Kits are available for all Rheodyne
®
brand products. Included
in each individualized RheBuild Kit are all parts, tools, and instructions
tomaintain precision performance of your particular product. RheBuild
Kits eliminate individual part ordering.
Figure 1 Air present in the needle
port tube is pushed by the syringe
during loading into the sample loop
Figure 2 Pathway of the fushing
mobile phase using the Needle Port
Cleaner, Part # 7125-054 (see page
139) when the injector is in INJECT
Air
How to Avoid Pressure Transients
Air in the sample loop can cause an instantaneous system pressure drop that
eventually returns to a normal level. Air causes the pressure to drop when the
injector moves from the LOAD to the INJECT position. When large sample
loops (≥100 µL) are partially loaded, air present in the needle port tube is
pushed into the sample loop (see Figure 1). Air can also enter the sample
loop from siphoning which occurs when the vent line is higher than the
injection port. In either case, upon injection, the system pressure collapses
the air bubble, causing pressure to drop momentarily.
A pressure drop in the system caused by air results in changes in retention
time, artifact peaks, and affects column performance.
Avoid pressure drops by removing the air in the needle port tube. Do this
by fushing about 1 mL of mobile phase with a luer syringe with needle port
cleaner. Keep the needle port tube flled with mobile phase by occasional
fushing. Adjust the vent line(s) so the outlet is at the same horizontal level as
the needle port (see Figure 2). For additional injection troubleshooting, refer
to the Rheodyne Troubleshooting Guide for HPLC Injection Problems. You
may download the Guide from the IDEX Health & Science web site:
www.idex-hs.com under Support.
Application Note
Order Online
www. idex-hs .com
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com