A Division of Alabama Specialty Products, Inc.              
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Model ER7300

Electrical Resistance Probe, Retrievable Spiral Loop
for High Pressure (HPTM and MHTM) Access Systems

View data sheet (PDF)


Model ER7300 spiral loop probe is a retrievable, electrical resistance probe designed for use with both the HPTM and MHTM high pressure access systems. The element is a spiral wound strip encased in epoxy. This approach to element construction offers several advantages over other element geometries:

  • High intrinsic resistance - provides highly stable readings with low susceptibility to noise.
  • High element strength - allows use in very high flow rate regimes such as gas transmission.
  • Wide spacing of element loops - minimizes the risk of iron sulphide scaling and bridging.

While the spiral loop probe is ideally suited to fast flowing, sour systems, its high stability makes it a suitable choice for all oil and gas systems.

Insertion length (I.L.) can range from a minimum of 3.75" up to any length (in 1/8" increments) specified by the customer, using the formula:

I.L. = PD + WT + 1.75"
(where PD = penetration depth, WT = wall thickness)

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


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


ER7300 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
K - SP10 Spiral Loop - 10 mil thickness (5 mil useful probe life)
L - SP20 Spiral Loop - 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 1/8" = 0612) Click here to open Length Calculator
  Element Alloy
  ER Probe Options
00 - No shield
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.

Teflon® is a registered trademark of DuPont.
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 © 2024