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Model LP4000

Linear Polarization Resistance Probe
Retractable with Packing Gland & 2-Electrode Endcap

View data sheet (PDF)


Model LP4000 is a retractable, linear polarization resistance probe commonly used in field and plant applications. A specially designed packing gland is used with the probe for insertion into or retraction from a pressurized system without a process shutdown. The packing gland is designed to mount easily on a 1" piping system, but it can be modified for your specific mounting requirements. The probe assembly consists of a packing gland, an insertion rod with a hermetically sealed two-electrode endcap, and a six-pin connector welded in place. A safety chain is also provided to prevent blowout. Standard packing material in the packing gland is Teflon®, however, Grafoil® packing can be provided for high temperature applications. The insertion length (I.L.) is calculated to the end of the electrode and can be specified by the customer. For standard probes, the maximum insertion length is given in the chart below. Electrodes for the probe can be ordered separately. Several standard electrodes and probe lengths are available to meet your specific needs.


Probe Body - 316 Stainless Steel
Endcap Seal - Glass
Fill Material - Epoxy
Temperature Rating - 500° F / 260° C Teflon®
Temperature Rating - 850° F / 454° C Grafoil®
Pressure Rating - 2000 PSI / 138 Bar
Mounting - 1" Full Port Valve (min.)

Std. Length I.L. (Max)
24" 17.53"
30" 23.53"
36" 29.53"
42" 35.53"

The Easy Tool is required for probe insertion or retraction in systems with pressure over 150 pounds.

Related Documents

 Easy Tool
 Safety Chain Instructions
 Packing Gland Instructions
 Length Calculation for Retractable Probes
 Canadian Registration Numbers (CRNs)

LP4000 Ordering Information

LP45 - Linear Polarization 1" Female NPT Probe, Packing Gland with Teflon®
LP75 - Linear Polarization 1" Female NPT Probe, Packing Gland with Grafoil®
  Probe Body Material
22 - 316
44 - C276
  LP Electrode Options
20 - Two-electrode integral type
  Seal Type
1 - Glass
24 - 17.53" max. insertion length
30 - 23.53" max. insertion length
36 - 29.53" max. insertion length
42 - 35.53" max. insertion length
000 - None
Your Part Number



This list represents our most common options.  Many other sizes, alloys, and options are available.
Please contact your Metal Samples sales representative if you do not see what you're looking for.
(Note: Not all alloys are available with all element types and seals.)

Electrodes are replaceable and are sold separately (below.)


EL400 Style Electrodes

Common Electrodes
Alloy UNS Number Part#  
C1010 Carbon Steel G10100 EL4003752800000
304L Stainless Steel G30403 EL4001452800000
316L Stainless Steel S31603 EL4001592800000
CDA110 Copper C11000 EL4004192800000
CDA443 Admiralty Brass C44300 EL4004342800000
AL1100 Aluminum A91100 EL4002902800000
AL6061 Aluminum A96061 EL4003382800000
AL7075 Aluminum A97075 EL4002272800000
Other - Please specify in comments N/A EL400XXX2800000

Teflon® is a registered trademark of DuPont.
Grafoil® is a registered trademark of NeoGraf Solutions.
Metal Samples Company

P.O. Box 8
152 Metal Samples Rd.
Munford, AL 36268

: (256) 358-4202
Fax: (256) 358-4515

E-mail: msc@alspi.com

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