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Technical Support FAQ

BDS Series - BDS-3000 / 3960 / 306 Oxygen Analyzers

What type of electrolyte solution is used in the BDS analyers?
Please recommend a compatible fitting to connect the instrument to 1/4" copper tubing.
High ambient temperatures are causing the reading to rise between 10 and 12 ppb, triggering the alarm. What should I do?
Can you please provide the PID parameters of the temperature regulator and the procedure to control them?
What is minimum flow rate?
I was considering adding a CO2 trap to my incoming line to guarantee no CO2 exposure. The CO2 trap can give off Moisture (when absorbing CO2). Would a moisture enriched stream be bad for the BDS-3000?
What are the gas factors for the following gases - N2, H2, He, and Ar?
What are the parameters given by the test function in the BDS-3000?
How do you tune the PID temp controller?
Do you have a manual for the CN7700?
I have 2 BDS3000 measuring the same gas but the recording is totally different. One has a normal background to the low level of concentration we have but the other is too stable with some time peaks. Also the reading on the screen is fixed at 0.5 ppb as the output recording fluctuate at a totally different value. Diagnostics is OK. Does the motherboard need to be swapped out? I dont have a mother board for BDS3000 only for 3000 TA if it can be useful. Are they the same?
What pressure regulator is recommended to use with the BDS3000?
What is the adequate sample gas flow rate in case of detecting ultra trace O2 in Ar gas stream?
What is the correct gas factor in case of detecting ultra trace O2 in Ar gas stream?
Our customer replaced a 366 with a BDS3000. The operation of this analyzer is as follows;

Sample gas: pure argon (O2 is about 10ppb)
ZERO gas: sample gas with O2 scrubber
SPAN gas : 1.9ppm O2 in Ar

Always the background gas is argon. In this situation, do we have to set the factor 0.79? or 1.00?
Our client informs us that they read in the parameters menu that internal temperature >50C. They are asking where the temperature sensor is as in the manual it says the sensor is bad in this condition. But as I remember this sensor does not exist any more . Can you please confirm that?


What type of electrolyte solution is used in the BDS analyers?

The type of electrolyte solution used is "Type E".


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Please recommend a compatible fitting to connect the instrument to 1/4" copper tubing.

Swagelok sells VCR quarter inch compression fitting adapters. The ordering number for this 1/4" VCR to 1/4" tube connector is SS-4-WVCR-6-400. You will also need gasket P/N NI-4-VCR-2-GR-VS.


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High ambient temperatures are causing the reading to rise between 10 and 12 ppb, triggering the alarm. What should I do?

Here are the instructions to change temperature:

1. Press MENU until 'SET PT' prompt appears
2. Press ENTER, display advances to 'SP 1' or setpoint #1
3. Display should be showing previous temperature setpoint, in this case 32 degrees C, and first digit should be flashing
4. Press MAX to increase flashing digit from 0 to 9
5. Press MIN to activate next digit (next digit will be flashing)
6. Continue to use MAX and MIN to enter your 4 digit setpoint #1 value, in this case customer wants 38.8
7. Press ENTER, display flashes 'Strd' message only if a change is made
8. keep pressing MENU till it returns to normal mode

You may have to change the Alarm 1 setpoint as well, as it interrupts power if temperature exceeds the setpoint of the alarm.

1. Press MENU until 'ALAr 1' prompt appears
2. Press Enter, display advances to 'ALAr. 1 Enbl' or 'dSbl' submenu
3. Keep pressing ENTER to advance until the alarm 1 hi value submenu is reached 'AL 1. H'
4. First digit should be flashing. Use the MAX and MIN to adjust the value, I would recommend 42 degrees C.
5. Press Enter, display flashes 'STrd' message only if it was changed
6. Keep pressing menu until the display returns to normal.

You can download the pdf manual of the temperature controller as well.


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Can you please provide the PID parameters of the temperature regulator and the procedure to control them?

1. To set the temperature, press the Menu key once -- the bottom display should blink. Set the temperature to 32.0 degrees centigrade using the Up and Right arrow keys. Press Enter when done.

2. To adjust the PID parameters, press the Menu button repeatedly until display shows oUt 1. Press Enter and change the following parameters in the submenus:

SelF = dSbL
Ctrl type = PId
ACtn type= rvrS
PrOP bAnd= 1
rESt StuP= 467*
rAtE StUP= 117*
CyCl = 0007*
dpnG=0003*

3. Set up Alarm 1. Press Menu repeatedly until display shows ALr. 1 . Press Enter and set the following parameters in the submenus:

ALr.1 =Enbl
ALr.1= AbSo
ALr.1= unlatched
ALr.1=n.c.
ALr.1=Abov
A.P.on= EnbL
AL 1.L=Dont Care
AL 1.H=40.0

I have seen that at power up, there is a temperature overshoot that may go all the way to 40 degrees, but it should settle after that.


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What is the minimum flow rate?

The manual states 0.5liter/min or 1.0 SCFH.

The unit must be run at this flow or slightly above. If not, erroneous results may occur.


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I was considering adding a CO2 trap to my incoming line to guarantee no CO2 exposure. The CO2 trap can give off Moisture (when absorbing CO2). Would a moisture enriched stream be bad for the BDS-3000?

Moisture, in the gas phase, will not hurt the BDS sensor at all.


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What are the gas factors for the following gases - N2, H2, He, and Ar?

N2=1
H2=1.99
He=1.99
Ar=0.79


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What are the parameters given by the test function in the BDS-3000?

The factors given by the test function in the BDS3000 are:

fCalib_factor - is the span calibration factor; default is 4.58, max is 13.5, min is 1.5

AtoD_ave - is the current value of the Analog to Digital converter. It is directly proportional to the output of the BDS amplifier; min is -26000, max is 262144. A reading outside this range would mean the amplifier is saturated.

lOffset[0] - Analog to Digital converter value of the amplifier offset of gain 0 (100 ppb @ N2) at zero (or electronic zero if never been zeroed). min is -10000, max is 2500000

lOffset[1] - Analog to Digital converter value of the amplifier offset of gain 1 (1000 ppb @ N2) at zero (or electronic zero if never been zeroed). min is -10000, max is 250000

lOffset[2] - Analog to Digital converter value of the amplifier offset of gain 2 (10 ppm @ N2) at zero (or electronic zero if never been zeroed). min is -10000, max is 25000

lOffset[3] - Analog to Digital converter value of the amplifier offset of gain 3 (100 ppm @ N2) at zero (or electronic zero if never been zeroed). min is -10000, max is 25000

tempOffset - Analog to Digital converter value of the temperature amplifier offset; min is -10000, max is 10000

current_gain - The gain the analyzer is currently on. The ranges listed next are approximate only: 0 is the 100 ppb gain for N2, 1 is the 1000 ppb gain for N2, 2 is the 10 ppm gain for N2, and 3 is the 100 ppm gain for N2.


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How do you tune the PID temp controller?

To tune the PID controller is better first to let the PID controller do self-tuning.

- First adjust the temperature setpoint to the desired temperature, 35 degrees C.
- press menu button until SP1 blinks in the upper left corner.
- Adjust the value to 35.0 using the arrow keys.

- Next tune up the pid controller:
- Press menu button repeatedly until 'Out 1' is shown on the display
- press Enter
- PressMenu button repeatedly until 'Auto PId' is shown
- Press Enter, the display flashes 'EnbL' or 'DSbL'
- Use the arrow key to Select 'EnbL'
- Press Enter, the menu will advance to next function
- Press the menu button a vew times to advance to 'Strt PId'
- Press Enter
- Use arrow key to toggle display to 'EnbL'
- Press Enter, the menu will advance to next function 'Cycl tine'
- Press Enter, then adjust value to 0001 if not already set.
- press enter to advance to next menu
-press right arrow keys a couple of times.
- The display should show that it is autotuning by showing 'Atun'

- Leave this going until it is done.

IMPORTANT: Ths should be done when the room is cold. PID self tuning can fail if temperature outside the over is too close to setpoint. If this is not so, the auto tune feature may fail.

- Once the auto tuning is done, one should check how stable the O2 reading is. If it is still oscillating a bit, I like to narrow the P value to 1.0
- Press menu key repeatedly until 'Out 1' is shown on display
- press Enter
- press menu button repeatedly until 'PrOP bAnd' is shown on
display - Press enter
- Adjust value to 1.0 using arrow buttons
- Press enter
- Press right arrow keys a few times to return back to normal operation display.




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Do you have a manual for the CN7700?

Please refer to this document: CN77000_manual.pdf


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I have 2 BDS3000 measuring the same gas but the recording is totally different. One has a normal background to the low level of concentration we have but the other is too stable with some time peaks. Also the reading on the screen is fixed at 0.5 ppb as the output recording fluctuate at a totally different value. Diagnostics is OK. Does the motherboard need to be swapped out? I dont have a mother board for BDS3000 only for 3000 TA if it can be useful. Are they the same?

Yes, it is the same board, just remove the eprom and install the new one. Then do a cold start by pressing the system during the introduction screen.


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What pressure regulator is recommended to use with the BDS3000?

It is made by Tescom and the TAI part number is R2571. The Tescom part number is 64-3660-KRU10

Some versions of the the BDS 3000 come with this regulator built in.


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What is the adequate sample gas flow rate in case of detecting ultra trace O2 in Ar gas stream?

One standard liter per minute is fine. Flow rate is not critical as long as it is reasonably constant. It must be at the minimum 0.5 standard liter per minute.


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What is the correct gas factor in case of detecting ultra trace O2 in Ar gas stream?

The argon factor is 0.79.


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Our customer replaced a 366 with a BDS3000. The operation of this analyzer is as follows;

Sample gas: pure argon (O2 is about 10ppb)
ZERO gas: sample gas with O2 scrubber
SPAN gas : 1.9ppm O2 in Ar

Always the background gas is argon. In this situation, do we have to set the factor 0.79? or 1.00?


Leave the gas factor at 1. The set up has span gas with the background in Argon so there is no need to add a gas factor.


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Our client informs us that they read in the parameters menu that internal temperature >50C. They are asking where the temperature sensor is as in the manual it says the sensor is bad in this condition. But as I remember this sensor does not exist any more . Can you please confirm that?

The sensor is a thermistor that is located behind the BDS sensor PCB. So it is with the BDS sensor. If the temperature is reading >50 C, then the unit should be cold started with the sensor cable plugged in to the BDS sensor, so the software recognizes the thermistor.

To cold start, you need to press the system key during the introductions screen after the unit is powered back up.

If after this procedure, the temperature keeps reading out of range, then it is possible that the sensor cable has a broken wire, or the thermistor itself in the BDS sensor is open.


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