Vacuum Gauge Controller
- Steve Gibson
Table of Contents:
Introduction
Two vacuum gauges are located on the main KPF vacuum chamber and are monitored by a Leybold Graphix Two gauge controller.
Relevant Devices
Description | Qty | Source | Part Number | Notes |
|---|---|---|---|---|
Vacuum Gauge Controller | 1 | Leybold | Graphix Two | Controls the gauges on the chamber |
High Vac gauge | 1 | Leybold | PTR 90 N | Combo Pirani and Cold Cathode gauge |
Low Vac gauge | 1 | Leybold | TTR 91 N S | Pirani gauge |
RS-232 to Ethernet Adapter | 1 | Lantronix | UDS 2100 | This is the version with two serial ports (but standard 9-pin RS-232 connectors) |
Smaller Footprint Power Supply for Lantronix | 1 | Tri-Mag, LLC | Tri-Mag PN: L6R12H-120 DigiKey PN: 364-1264-ND | The stock Lantronix power supplies do not work well with the PDUs (as they block two extra outlets). KPF chose these replacement supplies since they only take up one PDU outlet. |
Functional Block Diagram
Cable Details
Cable | Qty | Details | Notes |
|---|---|---|---|
Ethernet | 1 | Cat6 Copper Ethernet Cable M-M, 6 feet long | Entirely within Vac Cart. |
RS-232 | 1 | DB9, M-F, Straight through, 3 feet long | Entirely within Vac Cart. |
Gauge Cables (Vac Cart) | 2 | Shielded ethernet cables, RJ-45, M-M, 6 feet long | Entirely within Vac Cart. |
Gauge Cables (Chamber) | 2 | Shielded ethernet cables, RJ-45, M-M, 10 feet long |
|
Bulkhead Coupler (Dual) | 1 | Universal Sub-Panel Black, 2 Black Feed-Thru Couplers, RJ45K (8x8K) Straight |
|
Pictures of Devices
Relevant Datasheets & Manuals
Description | File | Source | |
|---|---|---|---|
| 1 | Leybold Graphix Two Manual | 
| https://www.leyboldproducts.com/media/pdf/0f/9e/dc/300550402_002_C1_GRAPHIX_123_EN.pdf |
| 2 | ‘Vacuum Measurement’ brochure containing specs on various gauges, including both of our gauges (PTR 90 N and TTR 91 N S) | 
| |
| 3 | PTR 90 N Vacuum Gauge ‘Technical Data’ sheet | 
| |
| 4 | CAD Model for PTR 90 N gauge. | 
| |
| 5 | Datasheet for TTR 91 N S gauge. Seems a bit outdated, and was downloaded from a vac supply company (not Leybold). However there was nothing on this part number at Leybold (closest was a TTR RNS model, which might be the newer version of our gauge). | 
| http://vacshop.ir/wp-content/uploads/2016/02/vacshop-THERMOVAC_New-TTR91N.pdf |
| 6 | Lantronix UDS 2100 Quick Start Guide |  | https://www.lantronix.com/products/uds2100/#tab-docs-downloads
|
| 7 | Lantronix UDS 2100 User Guide |  | |
| 8 | Smaller Footprint Power Supply Datasheet |  | https://www.tri-mag.com/wp-content/uploads/2021/05/L6R12H_Series_2021-01.pdf (Linked off the DigiKey product page) |