Frequently Asked Questions

​3000 Series Application Notes on Restrictors, Pressures and Flow Recommendations

​​3000 series analyzers require reasonably regulated sample pressures. While the 3000 analyzers are not sensitive to variations of incoming pressure (provided they are properly vented to atmospheric pressure) the pressure must be maintained as to provide a useable flow rate trough the analyzer. Any line attached to sample vent should be 1/4 or larger in diameter. 

FLOW RATE RECOMMENDATIONS: 

A usable flow rate for a 3000 series analyzer is one which can be measured on the flowmeter. This is basically .2 - 2.4 SLPM . The optimum flow rate is 1 SLPM (mid scale). Note: response time is dependent on flow rate, a low flow rate will result in slow response to O2 changes in the sample stream. The span flow rate should be the approximately same as the sample flow rate. 

CELL PRESSURE CONCERNS: 

The sensors used in 3000 series analyzers are optimized to function at atmospheric pressure. At pressures other than atmospheric the diffusion rate of O2 will be different than optimum value. Higher pressures will produce faster O2 diffusion rates resulting in higher O2 reading and shorter cell life. To use a 3000 series analyzer at a cell pressure other than atmospheric, the analyzer must be calibrated with a known calibration gas at the new cell pressure to adjust for the different diffusion rate. Cell pressures below 2/3 atmospheric are not recommended because as they tend to cause excessive internal expansion which may result in seal failure. 

For operation at cell pressures other than atmospheric care must be taken not to change the sample pressure rapidly or cell damage may occur. For cell pressures above atmospheric, caution must be exercised to avoid over pressuring the cell holder. ( percent analyzers will require some type of cell retainer to prevent the cell from being pushed out by the pressure .) For operation at pressures below atmospheric pressure a suffix C ( clamped) cell is required. 

RESTRICTION DEVICES: 

For proper operation, all 3000 series analyzers require a flow restriction device. This device is typically a restrictor or a valve. This restriction device serves two functions in the sample path. The first function is to limit the flow rate of the sample through the analyzer. A restrictor is chosen to operate over a range of pressures and provide a useable flow rate over that range.

The second function that the restriction device provides is a pressure drop. This device is selected to provide the only significant pressure drop in the sample path. 

RESTRICTOR KIT 

The current revision of the 3000 series analyzers are supplied with a kit containing two restrictors and a union which are user installed. These parts supplied to give the end user more flexibility when installing the analyzer. The restrictor kit is suitable for high and low positive pressure applications as well as vacuum service ( atmospheric pressure sample) applications ( see manual for installation instructions).

The standard restrictor ( BLUE DOT ) is recommended for pressures between 5 PSIG and 50 PSIG. For positive low pressure application ( 5 psig or less ) the un-marked restrictor is better suited . For none pressurized sample applications the marked restrictor should be used and configured for vacuum service. Note: for extremely low positive pressure applications ( less then 2 psig) the vacuum service configuration should provide higher performance ( higher flow rates). For vacuum service the end user must supply a vacuum pump and a by-pass valve for the pump. A vacuum level of 5 - 10 inches of mercury should provide the optimum flow rate.

CAUTION: flow restrictors have very small orifices and may be plugged by small particles ( .005” dia or larger) A sample filter must be included in the sample line prior to the restrictor! ( a 60 micron filter is recommended) 

3000TA EXAMPLES:

Example 1

with a incoming pressure of 10 psig the std restrictor (blue dot) will provide a flow rate of .76 SLPM. Up-stream of the restrictor the sample line pressure will be 10 psig, while down stream ( including the cell) the pressure will be at atmospheric pressure.( analyzer vented to atmospheric pressure) Note, all other pressure drops in the sample path are insignificant at these flow rates. This insures that the cell operates at atmospheric pressure. At very high flow rates ( off scale of flow-meter), pressure drops other than the restriction device could become significant , and result in pressurizing the cell. 

Example 2

A 3000TA is configured for vacuum service as follows. The un-marked restrictor is placed in the sample vent port. The down stream end of the restrictor is then connected to a vacuum pump and by-pass valve. The by-pass valve is adjusted to provide a flow rate of 1 SLPM. The sample pressure between the pump and the restrictor will be approximately -7 inches of mercury, while the pressure in the balance of the sample system including the cell will be approximately​ at atmospheric pressure (provided the sample flow into the analyzer is not blocked.) 

BY-PASS: 

To improve the system response, a by-pass can be added to increase the sample flow rate to the analyzer by a factor of ten. A by-pass provides a sample flow path around the analyzer of 2 - 18 SCFH. typically.

CALIBRATION GAS: 

3000 series analyzer requirements for units with Auto-Cal options. The customer must supply a control valves (or restrictors) for any SPAN or ZERO gas source which is attached to the Auto-Cal ports. The valve should be adjusted to the same flow rate as the sample gas . When restrictors are used, the gas pressure must be adjusted to achieve the proper flow rate. 

OPERATION WITHOUT A RESTRICTOR DEVICE: 

Operation without a restrictor device is not recommend as mentioned above. A 3000TA without any flow restrictor device was tested on 11-19-97. This results in a flow rate of 2.4 SLPM @ 1 PSIG. This is a cv of 0.023 for the standard sample system.

TAI PART NUMBERS

RESTRICTOR KIT: A68729 

UNION (SS) U11 

LP. RESTRICTOR R2323( LOW PRESSURE / VAC. SERVICE )

STD.. RESTRICTOR R2324 BLUE DOT 

NUT N73 

FERRULE F73 

FERRULE F74 BOTH FERRULES ARE REQUIRED 

CONVERSIONS: 

1 PSI = 2.04 INCHES OF MERCURY (in. Hg.) 

1 SCFH = 0.476 SLPM

A: The three user ranges are selectable in the field and you can select ranges by pushing the membrane switches on the keypad.​

A: With the Model 3000TA, the minimum range can be 10 ppm and the max 1%. With the 3000PA, you can go from 1% to 100%. Again, these are the ranges. Typically the lower detecting limit is 1% of the range.

A:  The normal life of a sensor is about 6-8 months depending on O2 levels, temperature of gas, and the amount of water vapor in the stream. Normally trace O2 sensors would have a little longer life than percent O2 sensors. 

A: The sensors are always in stock and can be shipped the same day by courier. Contact Teledyne for the most recent price quote.

If you have CO2 in the stream, please advise us as you need a different sensor for such an application. 

A: The instruments will not be effected by power outage. However, continue to flow gas through the units as to not saturate the sensors with O2.

A: The 4-20ma modules are supplied on of two ways: 

as a component from Analog Device, Part Number 1b-22 AN

(device with the white label) or

as a separate circuit board mounted on the top.

A: Please refer to the following document: 3000_connector_kit.pdf​

A: Please refer to the following document: MFC_End_of_Life_Determina​tion.doc​

A: There are the two options for replacement of bad keypad. 

1) For just the keypad replacement, order P/N D76672A (membrane keypad), and 3000TA label p/n B76673A. 

2) The complete door assembly (including display board) for a model 3000TAEU is p/n C66285A.

A: Yes it is.

A: Check the fuse condition. If the fuse is healthy then check the DC voltages on the Rear Panel BD. Refer to this document for instructions on how to test DC voltages: 

How_to_Test_the_DC_Voltages_On_Rear_Panel_Board-3000TA.pdf

A: Generically it will not damage the cell permanently. Once the water is dried out the cell works fine.​

A: The 4-20 output will drop to 4ma when the stand by switch in front is pressed. 

It will drop to zero only if the ac is removed. 

They can use the system alarm relay if need an alarm when the system goes into bypass. ​

A: The 3000T alarm value can only be an integer (e.g. 1 ppm, 2 ppm, 3 ppm .... 99,999 ppm)

The 3000P alarm value contains two decimal places (e.g. 0.00%, 0.01%, 0.02% .... 99.99%, 100.0%)​

​A: The procedure is as follows:

• Press the System button to bring up the System menu.
• Select the MORE function and press the Enter key to go to the second set of the System menu.

Ver S-Test Dac-Cal

Show_Negative= NO

• Select the 'Dac-Cal' function and press Enter. The first screen will appear for the first calibration, to adjust the 4 mADC output

Zero 4 to 20 ma out

< ENT > to OK: 0

• Connect a DVM configured as an ammeter across the the percent of range 4-20 madc output. Adjust the value on the second line using the Up/Down keys, till DVM reads 4.00 madc (the range of adjustment on the second line is ± 200 which corresponds to approx. ± 1.6 mADC change in the output).
• Press the Enter key to calibrate the 20 mADC output

Cal 4 to 20 ma out

< ENT > to OK: 0

• Again use the Up/Down keys to adjust the DVM till it reads 20.0 mADC. The range of the number on the second line is ± 200 as well.
• Press Enter to return to the System menu​

A: Cold Start Procedures

Caution: This procedure deletes all previously stored data and test results, and resets the user selectable parameters to their default values.

The Cold Start procedure can be a useful tool. It resets the instrument to factory set conditions when the instrument is operating in an undesirable manner due to erroneous input or electronic conditions. This procedure will also erase the password.

Model 2000:

Turn power off. Turn the power back on and while the introductory screen is displayed (1 - 2 seconds) hold down the system button for about 7 seconds. This will erase any calibration data such as zero and span. If you continue to hold the system button for more than 15 seconds all data will be erased.

Caution: This procedure will erase the calibration curve information stored in the curve algorithm for linearization. The curve algorithms are configured at the factory to the user's application specification. These functions should only be reprogrammed by trained, qualified personnel.

Note: The programming functions of the curve algorithm requires a password or a computer connected to the RS-232 connector to satisfy the password protection feature. For instruments with software 1.1.4 or later, turn the instrument off and back on. While on the introduction screen hold the analyze key for at least 15 seconds to bypass the password protection feature.

Model 2020:

Turn power off. Turn power back on and while the introductory screen is displayed (1 - 2 seconds) turn the enter/escape switch to the escape position for about 7 seconds. This will erase any calibration data such as zero and span. If you continue to hold the escape position for more than 15 seconds all data will be erased.

Caution: Same as for the Model 2000 (see above).

Models 3000 and 3010:

Turn power off. Turn power back on and momentarily press the system button.

Models 3000ZAXL & 3000-ZAXL-3:

During the warmup time, press the UP & DOWN arrows simultaneously. The screen will show:

"Really Cold Boot??"

"ENTER-YES ESCAPE-NO"

Pressing ENTER will cause the reset of the eeprom.

Pressing ESCAPE will abort the reset.

Models 3020 T, P & M:

Cold starting the analyzer reverts it back to factory default. At the end of a cold start, the analyzer must be recalibrated, and the ranges and alarms must again be set to user preferences. Take note of these settings before initiating the cold start.

1. Turn the analyzer off by entering the Standby function in the main menu.

2. Turn the analyzer back on by turning any switch once.

3. During the introduction screen (introduction screen lasts approximately one minute), turn the Escape switch once.

4. The analyzer will enter the electronic zeroing mode. No action is required. You cannot skip this step.

5. At the end of electronic zeroing, the analyzer will enter self-test mode. 

6. At the end of self-test, the analyzer enters the analyze mode. The analyzer has reverted to factory defaults. Recalibrate the analyzer, set the ranges, and set the alarms.