CPM223/CPM253 Transmitter Selection Code Overview
The CPM223 and CPM253 series transmitters are selected through multi-digit codes. The code fields successively cover sensor input and software, power supply, output, additional contacts, and additional functions. Engineering and procurement personnel can determine the code item by item according to on-site measurement requirements, then combine them into a complete model.
The original selection table uses 'Feature, Value, Description' as columns. This article splits it into tables by code field for quick verification. Options marked with *** usually correspond to certification or special configurations. Before selection, confirm on-site compliance requirements.
1. Sensor Input and Software Version
This field determines the sensor types and software function level supported by the transmitter. Memosens digital and analog pH/ORP inputs correspond to different codes. Special versions require a separately defined TSP number.
| Code | Description |
|---|---|
| IS | pH (glass/ISFET) / ORP; additional functions |
| MR | Memosens digital, pH (glass/ISFET) / ORP; basic version |
| MS | Memosens digital, pH (glass/ISFET) / ORP; additional functions |
| PR | pH (glass) / ORP; basic version |
| PS | pH (glass) / ORP; additional functions |
| YY | Special version, please define TSP number |
2. Power Supply Options
Power supply codes distinguish supply voltage and certification type. If the site has CSA general purpose or ATEX intrinsically safe/increased safety requirements, the corresponding code should be matched first.
| Code | Power Supply Specification |
|---|---|
| 0 | 230VAC |
| 1 | 115VAC |
| 2 | 230VAC; CSA Gen.Purp. |
| 3 | 115VAC; CSA Gen.Purp. |
| 4 | ***230VAC; ATEX II (3)G (Ex nAL) IIC |
| 5 | 100VAC |
| 6 | ***24V AC/DC; ATEX II (3)G (Ex nAL) IIC |
| 7 | 24V AC/DC; CSA Gen.Purp. |
| 8 | 24V AC/DC |
3. Output and Communication
Output codes determine the number of current output channels, HART communication, or Profibus bus type. Basic values and additional values correspond to different process variable output capabilities.
| Code | Output Description |
|---|---|
| 0 | 1x 0/4...20mA, basic value |
| 1 | 2x 0/4...20mA, basic value + additional value |
| 3 | Profibus PA |
| 4 | Profibus DP |
| 5 | 1x 0/4...20mA, basic value, HART |
| 6 | 2x 0/4...20mA, basic value, HART + additional value |
4. Additional Contacts
Additional contact codes are used for relay output, limit, timer, chemical cleaning, and 4...20mA input expansion. Select 05 when no additional contacts are required.
| Code | Additional Contact Description |
|---|---|
| 05 | Not selected |
| 10 | 2x relay (limit/P(ID)/timer) |
| 15 | 4x relay (limit/P(ID)/chemical cleaning) |
| 16 | 4x relay (limit/P(ID)/timer) |
| 20 | 1x 4...20mA input + 2x relay (timer/limit/P(ID)) |
| 25 | 1x 4...20mA input + 4x relay (chemical cleaning/limit/P(ID)) / P(ID) |
| 26 | 1x 4...20mA input + 4x relay (timer/limit/P(ID)) / P(ID) |
5. Additional Functions and Tag
The additional functions field is used to select special configurations such as Enviro or protective layer. The tag field is used to mark the instrument TAG and must be filled in according to additional instructions.
Additional Functions
| Code | Description |
|---|---|
| ENV | ***Enviro |
| PRL | ***Protective layer |
Tag (>>>Tag:)
| Code | Description |
|---|---|
| 1 | Tag (TAG), see additional instructions |
6. Selection Steps
- Confirm measurement requirements: Determine whether pH, ORP, ISFET, or Memosens digital sensor is required, and whether additional functions are needed.
- Select sensor input and software code: According to Table 1, choose IS, MR, MS, PR, PS, or YY.
- Select power supply code: Check supply voltage and CSA/ATEX certification requirements, and select the appropriate item from 0–8.
- Select output code: According to control system requirements, choose 0/4...20mA, HART, or Profibus PA/DP.
- Select additional contact code: Choose according to relay, limit, timer, chemical cleaning, and 4...20mA input requirements.
- Select additional functions and tag: If Enviro or protective layer is required, choose ENV or PRL; if TAG is required, select tag code 1.
- Combine and review the model: Concatenate the codes of each field in order, focusing on certification, communication, and special version TSP number.
7. Selection Precautions
- Certification codes cannot be replaced arbitrarily: ATEX and CSA options correspond to different market access requirements. Incorrect selection may prevent commissioning.
- Special versions require a defined TSP number: When selecting YY, a clear TSP number must be provided; otherwise, configuration cannot be completed.
- Communication outputs are mutually exclusive: HART and Profibus usually cannot be selected at the same time. The unique output code must be determined according to the DCS/PLC interface.
- Additional contacts affect expansion capability: 4x relay and 4...20mA input options affect wiring and functions and must be checked against the electrical design.
- Tag requires additional instructions: When selecting tag code 1, the TAG content should be stated in the additional instructions.
8. Conclusion
The CPM223/CPM253 selection table covers sensors, power supply, output, contacts, and functions with modular codes. Confirming each item according to the above steps can reduce mismatches and improve procurement accuracy. For codes marked with *** or special versions, it is recommended to attach complete technical specifications to the order.