Probe Replacement Reference Guide
Use this guide to determine which conductivity probe to use if your current probe needs to be replaced.
Common Probe Types
EL-MPC-SP (commonly called SP1)
Status: Obsolete as of July 2023
Availability: No longer available from the factory. Limited stock may remain in the dealer network.
EL-MPC-SP4
Status: Current production
Availability: Readily available for purchase
📷 Photos of all probe types are provided at the bottom of this page.
Important Compatibility Notes
MPC 3000 systems must be upgraded to MPC 5000 in order to function with the SP4 probe if the SP1 is no longer available.
SP2 and SP3 probes are obsolete and have been out of production for several years.
All Spectra Connect systems use the SP4 probe.
How to Identify Your MPC Board Chip Version
The easiest way to identify your MPC board's chip version is by checking the display panel. The version will appear as:
Spectra Watermakers A## or B##
You can also locate the chip physically: it's the large white square near the center of the circuit board (see image below for reference).
Probe Compatibility Table
| MPC Board Chip # | Direct Replacement Probe | Upgrade to SP4 Option |
|---|---|---|
| B## | SP1 | New MPC Board (EL-MPC-PCBDPA40) & SP4 Probe |
| A31 | SP1 | New MPC Board (EL-MPC-PCBDPA40) & SP4 Probe |
| A34 / A35 | SP4 + Daughter Board (EL-MPC-SPCBA) | New MPC Board (EL-MPC-PCBDPA40) & SP4 Probe |
| A36 | SP4 | N/A |
| A37 (first with built-in daughter board) | SP4 | N/A |
| A39 / A40 | SP4 | N/A |
MPC Board Example with chip location:
Daughter board (EL-MPC-SPCBA) example:
Note: A36 is compatible both with & without the daughter board
"SP1" Probe:
"SP4" Probe: