# Tri-clamp brewing sensor lids: 4, 6 and 8 in caps with every port a fermenter needs

> What lid lets me log temperature, pH, CO₂ and pressure from the top of a tri-clamp fermenter?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Xem Studio design on the standard solid cap of each size: a 1½ in clamp port at the centre and a ring of PG13.5 probe ports, Ø6 O-ring probe glands, ¼ NPT half couplings and a ½ in hose barb
- Page: https://xemstudio.com/objects/tri-clamp-brewing-sensor-lids/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-brewing-sensor-lids · Plain text: https://xemstudio.com/objects/tri-clamp-brewing-sensor-lids/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- For a vessel that can only be fitted through the top. Centre 1½ in clamp: a bubbler gravity cap, a thermowell, a dip tube, a carb stone or a racking cap. PG13.5 ports: pH, dissolved O₂ or CO₂ probes. Ø6 glands: temperature probes at two depths. ¼ NPT: a pressure transducer or gauge and a gas-in valve (nitrogen or CO₂). Barb: blow-off hose, or a gas-flow meter on the CO₂ coming off.
- Weight is read with the vessel on a scale; gravity can be read with the bubbler cap instead of a floating hydrometer.
- Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.

## Sizes

| size_in | layout | clamp_1.5in | pg13.5 | glands_6mm | npt_1/4 | barbs |
|---|---|---|---|---|---|---|
| 4 | basic | 1 | 1 | 1 | 1 | 1 |
| 6 | basic | 1 | 1 | 1 | 1 | 1 |
| 6 | full | 1 | 2 | 2 | 2 | 1 |
| 8 | basic | 1 | 1 | 1 | 1 | 1 |
| 8 | full | 1 | 2 | 2 | 2 | 1 |

## Where the files are

- DIN: [DIN 40430 Pg (Panzergewinde) threads: PG13.5 Ø20.4 major, 1.41 pitch (18 tpi), Ø18.6 core; the thread of 12 mm process probes (pH, dissolved O2 / CO2)](https://www.din.de/en) — standard — DIN; dimensions are facts (verify at link)
- ASME: [B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore](https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch) — standard — ASME; dimensions are facts (verify at link)
- GW Kent: [Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness](https://www.gwkent.com/triclamp-guide) — web — publisher's guide; dimensions cited
- Dixon: [14MPHR brewery hose barb: A and barb OD B (hose ID + 0.040 in) per size, ½ to 6 in](https://www.cooneybrothers.com/userfiles/ad/documents/Dixon_Sanitary_14MPHRG600_Catalog.pdf) — PDF — publisher's catalogue; dimensions cited
- Rubber Fab: [Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)](https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf) — PDF — maker chart; dimensions are facts (verify at link)

## Free STEP/STL (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/index.json

- sensor-lid-4in-basic: [STEP](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-4in-basic.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-4in-basic.stl) — 4 in sensor lid (basic): 1½ in clamp port at the centre; on r 34: PG13.5 probe port, Ø6 probe gland, ¼ FNPT, ½ in blow-off barb
- sensor-lid-6in-basic: [STEP](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-6in-basic.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-6in-basic.stl) — 6 in sensor lid (basic): 1½ in clamp port at the centre; on r 52: PG13.5 probe port, Ø6 probe gland, ¼ FNPT, ½ in blow-off barb
- sensor-lid-6in-full: [STEP](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-6in-full.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-6in-full.stl) — 6 in sensor lid (full): 1½ in clamp port at the centre; on r 52: PG13.5 probe port, PG13.5 probe port, Ø6 probe gland, ¼ FNPT, ½ in blow-off barb, Ø6 probe gland, ¼ FNPT
- sensor-lid-8in-basic: [STEP](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-8in-basic.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-8in-basic.stl) — 8 in sensor lid (basic): 1½ in clamp port at the centre; on r 70: PG13.5 probe port, Ø6 probe gland, ¼ FNPT, ½ in blow-off barb
- sensor-lid-8in-full: [STEP](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-8in-full.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-brewing-sensor-lids/sensor-lid-8in-full.stl) — 8 in sensor lid (full): 1½ in clamp port at the centre; on r 70: PG13.5 probe port, PG13.5 probe port, Ø6 probe gland, ¼ FNPT, ½ in blow-off barb, Ø6 probe gland, ¼ FNPT

## Questions

**Which lid for a 6 × 18 in vessel?**

The 6 in full lid: two probe ports, two temperature glands, two ¼ NPT ports, a blow-off barb and a 1½ in clamp port in the middle.

## Fits with

- [Tri-clamp bubbler gravity caps: measure specific gravity from the lid with two dip tubes](https://xemstudio.com/objects/tri-clamp-bubbler-gravity-caps/)
- [Tri-clamp caps with PG13.5 probe ports (12 mm pH, dissolved O₂ and CO₂ probes): 1½ to 4 in](https://xemstudio.com/objects/tri-clamp-pg13-5-probe-ports/)
- [Tri-clamp probe gland caps: Ø4, Ø6 and ¼ in probes, 1 to 3 per cap](https://xemstudio.com/objects/tri-clamp-probe-gland-caps/)
- [Tri-clamp vessels with a dished or round welded bottom: 4, 6 and 8 in, 12 to 24 in deep](https://xemstudio.com/objects/tri-clamp-dished-bottom-vessels/)
- [Tri-clamp dome lids: 1½ to 12 in, plain or with a port at the crown](https://xemstudio.com/objects/tri-clamp-dome-lids/)
- [Tri-clamp thermowells: 1½ and 2 in clamp, 2½ to 12 in insertion, ½ NPT top](https://xemstudio.com/objects/tri-clamp-thermowells/)