CCM253 Spare Parts List Overview
CCM253 is the core model of the LIQUISYS-M series transmitters, with a wide variety of spare parts and upgrade kits. Based on the official spare parts list, this article organizes key order numbers, specifications, and applications for quick reference by engineering technicians and procurement personnel. All spare parts are suitable for the LIQUISYS-M basic version or extended version, and some require the instrument serial number.

Relay and Output Modules
Relay Output Modules
Used to expand the relay output capability of the LIQUISYS-M basic version, supporting floating changeover contacts. Common models are as follows:
| Order Number | Specification | Description |
|---|---|---|
| 51500320 | Relay Output Module | 2 floating changeover contacts |
| 51511446 | Relay Module | 2 floating changeover contacts |
| 51500321 | Relay Output Circuit Board | 4 floating changeover contacts |
| 51511447 | Relay Module | 4 floating changeover contacts |
| 51504304 | Relay Output Module | 2 contacts + 4-20mA current input |
| 51504305 | Relay Output Module | 4 contacts + 4-20mA current input |
Note: Some modules need to be used with the main module; please confirm compatibility during selection.
Profibus Relay Module
71134732 is a Profibus DP relay module, including 1 relay module, 2 relays, and 1 current input DP connection, requiring hardware version 2.10 or above. This module is suitable for Profibus DP network expansion.
CCM2x3 Main Module Kits
The main module is the core processing unit of the transmitter, and different models support different communication protocols and input types. Common kits are listed in the table below:
| Order Number | Specification | Description |
|---|---|---|
| 51502467 | Kit CCM2x3 Main Module | Central module I1 |
| 51502497 | Kit CCM2x3 Main Module | Central module I1 HART |
| 51502468 | Kit CCM2x3 Main Module | Central module I2 |
| 51502496 | Kit CCM2x3 Main Module | Central module I2 HART |
| 51502495 | Kit CCM2X3 Main Module | Central module Profibus PA |
| 51502498 | Kit CCM2X3 Main Module | Central module Profibus DP |
| 71134731 | Kit CCM2x3: Central Processing Unit | Central processing unit |
When selecting the main module, it must be determined according to the fieldbus type (HART, Profibus PA/DP) and the number of input channels.
Power Supply and Transmitter Kits
Power Supply Modules
- 51500317: CXM2X3 AC Power Kit
- 51500318: CXM2X3 DC Power Kit
Transmitter Kits
- 51502466: KIT MKC1 MEK Transmitter Cl wo pH non Ex
- 51502465: Kit MKC1 MEK Transmitter Cl+pH non Ex
These kits are suitable for chloride and pH measurement in non-explosion-proof environments.
CXM253 Housing and Mounting Parts
The housing and internal mounting parts ensure the mechanical protection and connection reliability of the transmitter. Common spare parts are as follows:
- 51501068: KIT CXM253 Instrument Panel (Housing Cover)
- 71071446: Kit CxM253 Front Membrane + 6 Key Lifters
- 51501073: CXM253 Internal Mounting Parts
- 51502184: Transmitter Connection Head
- 51501072: CXM253 Mounting Base Plate
- 51501069: Mounting Hinge
- 51501079: CXM223 Terminal Block Power
- 51501074: CXM253 Flat Cable

Installation Accessories and Upgrade Kits
Installation Accessories
50086842: LIQUISYS Transmitter Column Mounting Kit, used to mount field transmitters on horizontal or vertical pipes (max diameter 60mm), material is stainless steel V2A.
Software and Function Upgrade Packages
Upgrade packages can extend transmitter functions and require the instrument serial number. Common upgrade packages are as follows:
- 51500385: "Extended Software" upgrade package, upgrades LIQUISYS-M basic version to S version (plus-package), supporting pH, conductivity, temperature, chlorine, oxygen, and other parameters.
- 51500963: "Cleaning Function" upgrade package, adds Chemoclean cleaning function. If the 4-relay board is not installed, 51500321 must be ordered separately.
- 51502460: pH measurement upgrade package, used to upgrade the basic version Liquisys S CCM2X3-EK to pH or ORP measurement.
- 51503526: pH measurement upgrade package, used to upgrade Liquisys S CCM2X3-ES to pH or ORP measurement.
Important Note: When ordering upgrade packages, the instrument serial number must be provided to ensure compatibility.
Selection and Procurement Recommendations
- Confirm the transmitter model and hardware version, and verify spare part compatibility.
- Select the corresponding transmitter kit or upgrade package according to the measurement parameters (pH, conductivity, chlorine, etc.).
- If relay output expansion is needed, select the module based on the number of contacts and current input requirements.
- When upgrading software functions, prepare the instrument serial number in advance.
- Refer to the order numbers during procurement to avoid confusion between similar specifications.
Through this spare parts list, the required components can be quickly located, improving maintenance efficiency.