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The Vaisala PTU300 is mounted on the wall chamber side of the thermal enclosureVac Cart. A hose connected to the pressure-measuring spigot on the PTU300 goes through the wall to measure the pressure inside the spectrometer thermal enclosure. This allows pressure within the thermal enclosure to be measured while placing the the heat source of the Vaisala itself outside in the hallway.
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Description | Qty | Source | Part Number | Notes |
|---|---|---|---|---|
Barometer/Humidity Sensor | 1 | Vaisala | PTU300 | Note Vaisala now offers an ethernet interface board for the PTU300, but it has to be installed at the factory. |
Serial Interface Cable | 1 | Vaisala | 19446ZZ | Purchased separately and installed by KPF team. |
RS-232 to Ethernet Adapter | 1 | Lantronix | UDS2100 | This is the version with two serial ports (but standard 9-pin RS-232 connectors) |
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Relevant Functional Block Diagram
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Software Actions
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Action
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Notes
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Read pressure value
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Value reported as telemetry (see below)
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Read temperature value
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Value reported as telemetry (see below)
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Read relative humidity value
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Value reported as telemetry (see below)
Required Adjustable Settings
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Setting
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When Needed
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Notes
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Build
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Observing
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Maintenance
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Pressure measurement frequency
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Yes
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No
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Maybe
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Set in configuration file. If this needs to be changed, edit configuration file, re-install, and then restart dispatcher.
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Temperature measurement frequency
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Yes
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No
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Maybe
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See pressure.
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Relative humidity measurement frequency
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Yes
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No
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Maybe
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See pressure.
Required Telemetry
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Parameter
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Report Frequency
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Purpose
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Notes
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Pressure measurement
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Once every 5 sec
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Environmental monitoring
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Managed through configuration file
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Temperature measurement
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Once every 5 sec
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Environmental monitoring
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See pressure.
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Relative humidity measurement
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Once every 5 sec
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Environmental monitoring
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See pressure.
Required Alarms
The Alarms page collects alarms across the entire KPF system.
A direct link to the Vaisala section of the Alarms page is given here.
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 uses these replacement supplies since they only take up one PDU outlet. |
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Relevant Functional Block Diagram
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Relevant Datasheets & Manuals
Description
Files
Python 2 software written by a student some years back. These lines of code were used to read values from the Vaisala while it was installed at Keck.
That installation was using a USB interface on a Windows machine. Not sure if the current serial interface will change anything here.
| View file | ||
|---|---|---|
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Description | File | Source | |||||
|---|---|---|---|---|---|---|---|
| 1 | Vaisala PTU300 User’s Guide (2019 version; device purchased in 2014) |
| |||||
| 2 | Calibration Certificates |
| These shipped with our actual KPF device | ||||
| 3 | Lantronix UDS 2100 Quick Start Guide |
| https://www.lantronix.com/products/uds2100/#tab-docs-downloads | ||||
| 4 | Lantronix UDS 2100 User Guide |
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Relevant Software
| 5 | Smaller Power Supply Datasheet |
| https://www.tri-mag.com/wp-content/uploads/2021/05/L6R12H_Series_2021-01.pdf (Linked off the DigiKey product page) |
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Dispatcher Implementation
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