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Model ER7220

Electrical Resistance Probe
Retrievable with Large Adjustable Flush Element
for High Pressure (HPTM and MHTM) Access Systems

View data sheet (PDF)



Model ER7220 is an adjustable-length, flush-mount, retrievable, electrical resistance probe for use with HP and MH high pressure access systems. These probes are ideally suited for applications where the probe element needs to be flush with the wall of the pipe to prevent any obstructions. The probe assembly consists of an insertion rod with an element, a hermetically sealed connector, and a hollow plug nut, which are all welded in place. The hollow plug nut on the probe screws into the hollow plug of the access system. This allows the probe to be installed in the process, using a retriever tool and service valve, without process shutdown. The insertion length (I.L.) can range from a minimum of 1.75" up to any length in 1" increments (specify lengths over 1.75" as 2", 3", 4", etc.) specified by the customer using the formula below. The adjustable flush element allows for a total adjustment of 1".

I.L. = PD + WT + 1.75"
(where PD = penetration depth, WT = wall thickness)
For top-of-the-line, flush-mount monitoring, PD = 0.

Note: Formula valid for access fitting heights of 5.25" (HP) and 5.5" (MH).

Two element options are available - The standard flush element which has a geometry that is specially designed to optimize element resistance, and the large strip type which is designed for use in systems where conductive deposits could bridge the standard element. Probe adaptors are available and must be ordered separately.


Probe Body - 316 Stainless Steel
Element Seal - Epoxy
Fill Material - Epoxy
O-Ring Material - Viton (other materials available)
Temperature Rating - 500° F / 260° C
Pressure Rating - 3600 PSI / 245 Bar
Mounting - High Pressure (HPTM or MHTM) Access System with Hollow Plug

ER7220 Ordering Information

HR - Electrical Resistance Probe for High Pressure (HP and MH) Access Systems
  Probe Body Material
2 - 316 SS
3 - C276
  Connector Type
1 - Small Connector
2 - Standard Connector
  ER Element Options
C - FL05 Flush Mount - 5 mil thickness (2.5 mil useful probe life)
D - FL10 Flush Mount - 10 mil thickness (5 mil useful probe life)
E - FL20 Flush Mount - 20 mil thickness (10 mil useful probe life)
F - FL40 Flush Mount - 40 mil thickness (20 mil useful probe life)
Q - LS5 Flush Mount Long Strip (Large Header) - 5 mil thickness (2.5 mil useful probe life)
R - LS10 Flush Mount Long Strip (Large Header) - 10 mil thickness (5 mil useful probe life)
S - LS20 Flush Mount Long Strip (Large Header) - 20 mil thickness (10 mil useful probe life)
  Seal Type
3 - Epoxy
  Length (Round calculated length down to the nearest 1/8")
Enter length in inches, stated in 2 decimal place format (Example: 6" = 0600) Click here to open Length Calculator
  Element Alloy
  ER Probe Options
AD - No shield, adjustable
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.)
* Chemically equivalent to standard pipe-grade carbon steels.
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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Metal Samples Company is a division of Alabama Specialty Products, Inc. - Copyright © 2023