GRT High-Temperature Connectors, up to +500 °C
−55 to +500 °C · stainless steel · hermetic receptacles
PPH25M Thermocouple Connectors with Compensating Contacts
Chromel / alumel contacts · 4 to 47 contacts · −60 to +200 °C
PPH25M connectors carry thermocouple signals without adding measurement error: contacts are made of thermocouple alloys — chromel (X), alumel (A) and nickel-copper (K) — so the junction through the connector stays matched to the thermocouple wire. PPH25M is rated from −60 to +200 °C; PPH25AM from −60 to +150 °C.
- Temperature
- −60 to +200 °C
- Contacts
- 4 to 47
- Contact material
- Chromel, alumel, nickel-copper
- Shell
- Threaded, M24 to M64
Key features
- Contacts in thermocouple alloys: chromel (X), alumel (A), nickel-copper (K)
- For thermocouple and DC circuits
- Layouts from 4 to 47 contacts, all Ø 2.5 mm
- Receptacles without backshell or with straight or 90° unshielded backshells
- Plugs with straight or 90° backshells, shielded or unshielded, including cable-clamp versions
- PPH25M to +200 °C (≥ 600 h); PPH25AM to +150 °C (≥ 1000 h)
Specifications
| Parameter | Value | Condition |
|---|---|---|
| AC voltage | 400 V | |
| Contact resistance | ≤ 50 mΩ | |
| Insulation resistance | ≥ 1000 MΩ |
| Parameter | Value | Condition |
|---|---|---|
| Operating temperature | −60 to +200 °C | PPH25M, ≥ 600 h |
| Operating temperature | −60 to +150 °C | PPH25AM, ≥ 1000 h |
| Vibration | 1–600 Hz, 10 g | |
| Shock | 12 g, repeated | |
| Durability | 200 mating cycles |
Values not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing. Specifications are subject to change; contact us for the current datasheet.
Contact layouts
All contacts Ø 2.5 mm. X = chromel, A = alumel, K = nickel-copper.
| Contacts | Contact materials | Thread |
|---|---|---|
| 4 | 2 X + 2 K, or 2 X + 2 A | M24 × 1.5 |
| 7 | 3 X + 4 K, or 3 X + 4 A | M33 × 1.5 |
| 20 | 10 X + 10 A | M52 × 1.5 |
| 26 | 4 X + 22 A | M52 × 1.5 |
| 47 | 23 X + 24 A, or 35 X + 12 A | M64 × 1.5 |
Other material combinations on request.
Versions
| Series code | Version | Notes |
|---|---|---|
| …-1 / -2 / -4 | Receptacle: no backshell / straight / 90° unshielded backshell | |
| …-5 / -7 / -9 | Plug: no backshell / straight / 90° unshielded backshell | |
| …-8 / -10 | Plug: straight / 90° shielded backshell | |
| …-11 / -12 | Plug: straight / 90° cable-clamp shielded backshell |
Contact counts and terminations
Standard contact counts
- 4
- 7
- 20
- 26
- 47
Terminations
- Solder
Typical applications
- Engine and turbine temperature measurement
- Furnace and kiln thermocouples
- Test benches and data acquisition
- Process temperature monitoring
Frequently asked questions
Why use thermocouple-alloy contacts?
A copper contact in a thermocouple circuit creates extra junctions and measurement error. PPH25M contacts are made of the same alloys as the thermocouple wire, so the signal passes through unchanged.
Selection guides
From sample to production
Send your requirement
Part number, drawing, pin-out or a short description of your application.
Configuration and quote
Our engineers match the configuration and reply with a drawing and quotation.
Samples
Samples are made to your order. Third-party testing to your specification is available on request.
Your approval
You test the samples in your own equipment and approve them.
Series production
Production follows the approved sample configuration.
Need a quote or a drawing?
Send your part number, pin-out or drawing. An engineer will reply by email.
Related series
PRG High-Temperature Circular Connectors, up to +400 °C
Up to +400 °C · 2 to 47 contacts · shielded or unshielded