Difference between revisions of "HIP::Keck"
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== Turbidity == | == Turbidity == | ||
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Mike says that we could build a turbidity sensor using LEDs and fiber-optic cables without too much difficulty. He is willing to help with construction if necessary. However, we both agreed that finding an assembly that meets our need would probably be the first course of action. | Mike says that we could build a turbidity sensor using LEDs and fiber-optic cables without too much difficulty. He is willing to help with construction if necessary. However, we both agreed that finding an assembly that meets our need would probably be the first course of action. | ||
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** Nephelometric Turbidimeter | ** Nephelometric Turbidimeter | ||
| − | + | Maduna: | |
I did some research on how to design a turbidimeter and found the following: | I did some research on how to design a turbidimeter and found the following: | ||
* [http://cs.earlham.edu/~hip/keck/turbidimeter/basic_turbidimeter_design.pdf Basic Turbidimeter Design] | * [http://cs.earlham.edu/~hip/keck/turbidimeter/basic_turbidimeter_design.pdf Basic Turbidimeter Design] | ||
Revision as of 10:47, 11 May 2007
Contents
Possible Commercial Product
- There may be general commercial products to solve this problem.
- See references
- Alex
- Hydrolab's integrated systems page.
http://store.pasco.com/pascostore/showdetl.cfm?DID=9&Detail=1&Product_ID=54417
Well Types
Stilling Well
http://nd.water.usgs.gov/gage/images/shedweb.jpg
- A vertical pipe with a relatively small opening (intake) in the bottom. It is used in a gauge installation to dampen short period surface waves while freely admitting the long period waves; which can then be measured by a water level gauge sensor inside. See float well and protective well.
- Used at gauging stations
- YSI is local - Yellow Springs, OH
- Pressure? Precise water level measurement technique. What locations?
- Turbidity - [Hach] Nephelometers
- Possibly build our own as cheaper alternative (fiber optics), engineering it ourselves.
- Budgeted for 41 student weeks, or $4100 of supply money
- Redox - Self cleaning? Not sure if it's worth it. Research it.
- [Vernier Sensors]
- Possible multi-variable sensors at around $1200, not sure if we can use them for this application.
- Start work on calibration early in the summer with Corrine and her students.
Sensors
- Determine required sensitivity and periodicity for each sensor.
- Mike said that sensitivity should be secondary to ruggedness and cost because the sensitivity that we are looking for is not high and most sensors will meet our needs. Thus, our approach should be to find sensors that we think will work and then send him the specs for him to OK.
- A selection of sensors from Hydrolab.
All-in-one Units, "Sondes"
- Most use batteries as the primary power source.
- Most have other features and sensors not listed in the matrix.
- All have the SDI-12 interface, which allows power and data over the same line with power management
- SDI-12 is not compatible with RS-232 because of voltage differences
- There are no interface cards for SDI-12, but there are converters for SDI-12 to RS-232 such as this one for $275 and this other one for $387.
- The user manual for all of the YSI series 6 sondes can be found here.
| Make | Model | Temp | pH | Redox (ORP) | Cond | Nitrate | DO | Sulfide | Turbidity | Specs | Data Storage | Power | Interface | Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Individual Sensors | y | y | y | n | y | y | n | n | USB | $1265.00 | ||||
| Loose Sensors | y | y | y | y | y | y | n | y | ||||||
| YSI Hydrodata | 600 R | y | y | y | y | n | y | n | n | no spec sheet | -- | -- | ||
| YSI Hydrodata | 600 XL | y | y | y | y | n | y | n | n | ?? | External 12VDC | RS232, SDI-12 | ||
| YSI Hydrodata | 600 XLM | y | y | y | y | n | y | n | n | 384K | 4 AA batteries, external 12VDC | RS232, SDI-12 | $4460.25 | |
| YSI Hydrodata | 6920 | y | y | y | y | y | y | n | y | 384K flash ROM | Batteries, external 12VDC | RS232, SDI-12 | $6327.00 | |
| YSI Hydrodata | 6820 | y | y | y | y | y | y | n | y | ?? | Batteries, external 12VDC | RS232, SDI-12 | ||
| YSI Hydrodata | 6600 | y | y | y | y | y | y | y | y | 384K | 8 C batteries, external 12VDC | RS232, SDI-12 | ||
| Rickly Hydrological Company | Datasonde 4A | y | y | add-in | y | add-in | y | add-in | add-in | no spec sheet | ?? | Batteries | RS232, SDI-12 | |
| Sutron | 5600-0703 | y | y | y | y | y | y | n | y | ?? | 4 or 8 AA batteries, 12VDC | RS232, RS485, RS422, SDI-12 | ||
| Campbell Scientific / Hach Environmental / Hydrolab | DS5 | ? | y | y | y | y | y | n | y | 512 KB memory | 8 C batteries | RS 232, RS 485, SDI-12 | ||
| Campbell Scientific / Hach Environmental / Hydrolab | DS5X | ? | y | y | y | y | y | n | y | 512 KB memory | 8 C batteries | RS 232, RS 485, SDI-12 | ||
| Campbell Scientific / Hach Environmental / Hydrolab | MS5 | ? | y | y | y | y | y | n | y | 512 KB memory | 8 AA batteries | RS 232, RS 485, SDI-12
|
Water Temperature
- Colin
RTP - Ruggedized Wide Range Temperature Probe
- 9 or 12 bit resolution
- 12 foot CAT 5 cable
- Dallas Semiconductor DS18S20 or DS18B20 sensors
- uses 1-Wire communication protocol
The RTP temperature probe is designed for wide temperature range applications requiring excellent chemical resistant properties and sensor submersion.
pH
- Jeff
Redox Potential
- Mikio
Conductivity
- Maduna
Nitrate Levels (NO3?)
- Bryan
Dissolved Oxygen
- Jeff
Sulfide Concentrations
- Colin
Turbidity
Jeff: Mike says that we could build a turbidity sensor using LEDs and fiber-optic cables without too much difficulty. He is willing to help with construction if necessary. However, we both agreed that finding an assembly that meets our need would probably be the first course of action.
- Cost Effective Turbidimeter
- Importance of Turbidity
- Nephelometric Turbidimeter
Maduna: I did some research on how to design a turbidimeter and found the following:
Batteries
- Heating and cooling.
Enclosures
Solar Panels
SBCs
- Power over ethernet? not supported by TS or Gumstix.
- Heating and cooling.
Gumstix
- Bryan
Technologic Systems
- Colin
| SBC | Type | DIO lines | A/D Converter | Price |
|---|---|---|---|---|
| TS-7200 | ARM | 20 | 8 ch. 12-bit (opt) | $149.00 |
| TS-7250 | ARM | 20 | 5 ch. 12-bit | $149.00 |
| TS-7260 | ARM | 30 & XDIO* | 2 ch. 12-bit | $179.00 |
| TS-7300 | ARM | 55 (35 XDIO) | n/a | $219.00 |
| TS-7400 | ARM | 20 | 4 ch. 8 bit | $129.00 |
| TS-5500 | x86 | 38 (IRQ) | 8 ch. 8 bit | $319.00 |
- eXtended Digital I/O functionality including pulse-width modulation, quadrature and edge counting, and pulse timing with IRQ/DRQ support.
TS-DIO64 Digital I/O Board
TS-DIO64 Digital I/O Board, which is a 8-bit PC/104 (standard format) peripheral board that provides 64 digital I/O points (32 inputs plus 32 outputs). Up to 4 TS-DIO64 boards may be installed into a single system, enabling up to 256 DIO points (128 inputs plus 128 outputs). The TS-DIO64 DIO functions are compatible with any PC/104 SBC including all the Technologic Systems ARM and X86 products. Consists of the following parts:
- 64 Digital I/O points - PC/104 peripheral board $69
- Optional 512 Kbyte battery-backed SRAM $40
- Optional 1M battery-backed SRAM $60
- 34 pin 18" ribbon cable $7
Total cost for all parts: $176
PC/104 GSM Cellular Modem Peripheral Board
PC/104 GSM Cellular Modem Peripheral Board, provides internet access through the GSM cellphone network. Standard baud rates up to 115.2 Kbaud. 230 Kbaud supported in x2 mode. Works with all TS boards. Takes standard SIM card with accompanying cellphone service costs. Optional capacitor for backup of modem memory on reset and startup. Consists of the following parts:
- Cellular modem peripheral board (modem not included) $79
- Sony Ericsson GR64 quad band RoHS GSM cellular modem $99
- Optional Panasonic Gold 10 farad capacitor $8
Total cost for all parts: $186
