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VTI Instruments 2008SDH-2AP, Instruction Manual

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Phone: (209) 754-0707 • FAX (209) 754-0104 • e-mail: [email protected] • http://val-tronics.com 

 

 

 
 
 
 

MODEL 2008SDH-2AP 

CARBON DIOXIDE MONITOR 

 

Instruction Manual 

 
 

 

Summary of Contents for 2008SDH-2AP

Page 1: ...Phone 209 754 0707 FAX 209 754 0104 e mail vti val tronics com http val tronics com MODEL 2008SDH 2AP CARBON DIOXIDE MONITOR Instruction Manual ...

Page 2: ...m 2 B Power Supply 2 C Circuit Board 2 Figure 1 Model 3 D Gas Cell Detector 4 Figure 2 Gas Cell 4 III INSTALLATION A Circuit Board 5 B Wiring 5 C Start up Precaution 5 IV OPERATION 5 Figure 3 Diagram 6 V SERVICING A Zero Adjustment 6 B Span Adjustment 7 VI SPECIFICATIONS 8 VII TECHNICAL NOTES 9 Figure 4 Ground Loops 9 Figure 5 Using a Filter 10 VIII ASSISTANCE TECH SUPPORT 11 IX WARRANTY 11 ...

Page 3: ...erate the instrument s electronics It consists of diode protection against reverse polarity of the 12VDC input power and solid state regulators to provide constant voltages for operation of various electronic circuits C Circuit Board All circuit components are mounted on a glass epoxy printed circuit board This board includes the gas detection amplifier electronic components integrated circuits po...

Page 4: ...VALTRONICS MODEL 2008SDH 2AP CARBON DIOXIDE MONITOR INSTRUCTION MANUAL Copyright 2017 VTI Valtronics Inc 3 FIGURE 1 Valtronics Model 2008SDH 2AP ...

Page 5: ...at most gases absorb infrared energy at a characteristic frequency In this instrument a broadband infrared source emits energy that is then filtered to produce a narrow range of frequencies characteristic of the carbon dioxide absorption spectra The band pass filter is chosen to match a strong absorption band of carbon dioxide while avoiding absorption bands from other gases that may be present An...

Page 6: ...o 16VDC has at least a 0 5 amp capacity The unit does not require a regulated supply 4 A dedicated power supply will also help avoid any ground loop problems with recorders or control circuits connected to the signal output of the unit 5 Separate wires are required for both the Common 4 20mA output and the Common 0 1V output if using both IV OPERATION See Figure 3 1 Apply 12VDC power to the unit a...

Page 7: ...gas cell 4 Before applying power connect a voltmeter to the 0 1V signal output 5 Verify that the unit has had at least a 5 minute warm up before attempting any adjustments 6 Make sure the flow meter is in a vertical upright position Open the regulator flow valve slowly while observing the flow meter 7 Adjust the flow to about 50 ml min ml cc or about 1 SCFH Standard Cubic Feet per Hour 8 After 3 m...

Page 8: ...nts are made Perform a span adjustment if required 5 Refer to the scale data charts which can be found on the data spec sheets on our website for the corresponding output voltage that matches the sample gas concentration 50 full scale units http www valtronics com assets 2008SD50 PDF 100 full scale units http www val tronics com assets 2008S100 PDF 6 Depending on the signal output reading turn the...

Page 9: ...VDC absolute min max Power Consumption Less than 3 watts 12 0 VDC 2 4 watts typical 7 2 watts peak Output Signals Voltage Output 0 to 1 volt 0 to full scale CO2 Current Output 4 to 20 mA 0 to full scale CO2 Zero Drift at Constant Temperature Less than 2 of full scale per 24 hours random not cumulative Zero Noise at Constant Temperature Less than 10 mV peak to peak measured at V out during any 20 s...

Page 10: ...e resistance of the wires The current flowing through the wire resistance creates a voltage drop current times resistance that would appear to be noise if the two loops were connected together This is classically called a ground loop problem 2 EMI Electro Magnetic Interference The infrared detector and its amplifiers are sensitive to strong magnetic fields that are building and collapsing at 50 Hz...

Page 11: ...VALTRONICS MODEL 2008SDH 2AP CARBON DIOXIDE MONITOR INSTRUCTION MANUAL Copyright 2017 VTI Valtronics Inc 10 FIGURE 5 ...

Page 12: ... defective part of parts which are returned to us freight prepaid or by making available at your plan via lowest freight rate a repaired or replacement material or at Valtronics option to credit the customer the original purchase of the item Our liability to you arising out of the supplying of this material or its use whether on warranty contract or negligence shall not in any case exceed the cost...

Page 13: ...VALTRONICS MODEL 2008SDH 2AP CARBON DIOXIDE MONITOR INSTRUCTION MANUAL Copyright 2017 VTI Valtronics Inc 12 NOTES ...

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