MODEL 400 CO2 Concentration Sensor user`s Manual
Contents
1. orientation with the detector located at the end of the sensing cell nearest to the mounting plate above the IR source is recommended so that any debris that might enter the sensing cell does not land on the detector For either configuration the sensor module should be mounted so that it is not subject to excessive vibration or shock which could alter its calibration and or decrease the operating life Figure 1 Model 400 Sensor module dimensions in inches Diffusion Style Sensor The diffusion sensor is intended primarily for monitoring the CO2 concentration in enclosed spaces such as the interior of an incubator A removable filter sleeve is provided over the sensor housing SUNSTAR 0 http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con For thru wall mounting a hole pattern similar to Figure 2 is required in the wall and the sensor assembly is installed with either the sensing cell or the circuit board passing thru the cutout A suitable gasket material to prevent gas exchange is usually necessary Sample Draw Sensor In the sample draw configuration the sensing cell has two 1 8 inch tube barb fittings for connection to the gas stream being monitored The sensor location is usually not critical so it can be mounted on a bracket2. E MN L szss20 63 con SUNSTAR DOD http www sensor i c con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con scale when the gas concentration reaches 5 use the following parameters for the J and K commands J 300 K 500 M Mode Command The M command is used to set the value of the 16 bit mode word The meaning of the bits is shown in Table 9 below The M command sets the value of the entire word to the value of the decimal integer parameter of the M command The value of the integer corresponding to a particular bit pattern is computed by adding the numbers in the value column of Table 9 for all the bits that are to be set The state of the mode word bits when the Model 400 is shipped from the factory are shown in the Def column of Table 9 The default mode word value is 25653 decimal Bit Value Function Def 0 1___ EnablelRsourre 1 2___ EnableRS 232 _ 0 Enable checksum Enable PID loop not implemented Enable expansion board features Enable relay UNUSED __ UNUSED Ho 0 0 For factory use only Both bits 0 must be 0 for normal operation 0 1024 Report CO 2048 Enable W command o0 4096 Enable writing of factory gain E 8192 Enable user adjustment buttons 16384 Enable analog output UNUSED 0 Table 9 Mode Bit Assignments P and T Commands These queries
3. EVENT IS DCS SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con LIABLE TO THE BUYER OR ANY OTHER PERSON FOR COST OF PROCUREMENT OF SUBSTITUTE GOODS LOSS OF PROFITS OR FOR ANY OTHER SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES To obtain service under this warranty unless DCS agrees otherwise Buyer must obtain a returned material authorization RMA number pack any nonconforming Product carefully and ship it postpaid or freight prepaid to the address provided when the RMA number is issued Buyer must include a brief description of the nonconformity Any actions for breach of this warranty must be brought within six months of the expiration of this warranty If DCS determines that a returned Product does not conform to the warranty in this section it will either repair or replace that Product at DCS s discretion and will ship the Product back to Buyer free of charge At DCS s option DCS may choose to refund to Buyer the purchase price for a nonconforming Product instead of repairing or replacing it Units returned for service under this warranty and determined on examination to be operating properly are subject to a service charge SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss
4. LOO SP The expansion board is connected to the Model 400 sensor module with a 14 pin ribbon cable that connects the main connector on the sensor module circuit board to the connector on the back of the display board Power Supply The expansion board can be powered with a 6 to 24 Vims AC or 8 to 30 volts DC power supply The power is connected to the two position POWER INPUT connector as shown in Figure 5 For AC power the polarity markings can be ignored SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con Digital Display The COo concentration is displayed on the four digit LCD display The displayed concentration is calibrated with the measurement calibration procedure Analog calibration has no effect on the displayed value During parameter adjustment mode target or prompt values are displayed Current Output The expansion board supplies a current ranging linearly from 4 to 20 milliamps as the CO concentration varies from O to full scale The current flows out of the terminal and returns through the terminal The maximum load resistance through which the full scale current can be driven increases at higher supply voltages With a 12 volt input the maximum resistance is about 500 Ohms Excessive loop resistance
5. interface which supports only power ground and measurement reporting signal connections All these connections appear on the OEM connector There is no ability to control any aspect of the sensor s operation using this interface The next level of complexity is the contact closure interface which supports switches or TTL level control signals to calibrate the measurement system and the analog measurement reporting signals The command interface allows the user to receive measurement results and control many aspects of the Model 400 using commands sent to the sensor via an ifc interface Analog Interface The Model 400 CO sensor indicates the measured CO9 concentration as a DC voltage on pins 1 and 3 of the main connector and pins 3 8 4 of the OEM connector The nominal output voltage range is from 0 to 1 0 volts as CO concentration ranges from zero to full scale All connections required for the analog interface appear on the OEM connector The minimal wiring to operate a Model 400 as an analog sensor requires only three signals Power at pins 1 or 2 ground at pins 4 or 5 and the DC output reporting signal on pin 3 Neither the measurement system nor the measurement reporting signal can be calibrated using this interface Contact closure interface Three control lines called UP DOWN and MODE at pins 5 6 8 7 of the main connector are used to calibrate the measurement system and the measurement reporting signals at p
6. is 0625 V Note Observe appropriate setup timing for MODE pin Table 4 Logic levels for Selecting Parameter to Adjust PWM Output The Model 400 CO sensor provides a digital TTL logic level output on pins 2 and 3 of the main connector that indicates the COp concentration measured by the sensor by its duty cycle i e ratio of time at logic high to time at logic low that ranges from 0 to 100 as CO concentration ranges from zero to full scale Command interface The Model 400 has an ifc bus connection at pins 4 clock and 14 data of the main connector see Table 3 on Page 7 When shipped from the factory the sensor is configured as a slave with an address of 60 decimal The Model 400 has a command processor that responds to the single letter commands shown in Table 8 There are two classes of commands queries and directives The Class column of Table 8 contains a Q or D to identify the class Directive commands instruct the sensor to perform an action and always have a single positive decimal integer value less than 65536 as a parameter Query commands request information from the sensor and are always associated with a 2 byte numeric value which must be read by the i c master Master mode and the Expansion Board Unless explicitly ordered otherwise the Model 400 is shipped with the expansion board interface enabled This means that the sensor periodically switches to master mode and attempts to SUNSTAR http
7. the initial response may be a busy packet When a busy response is received additional read requests should be performed without any intervening writes until appropriate response data received Response Packet Format When the M400 receives a read command from a master it always responds with a three byte response packet as shown Table 6 ASCII value of processed command mnemonic see Table 8 on page 15 or if error response or if busy response lo byte of response integer hi byte of response integer Table 6 ifc Command Response Format If the first byte is the ASCII value of the command mnemonic the following two bytes are the response to that command if command was a query or a copy of parameter integer if command was a directive SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con If the first byte is 33 or 63 decimal ASCII for and respectively the following two bytes are the error code from Table 7 If more than three bytes are requested by the master during a read the value of third byte will be sent as the fourth and subsequent bytes Error Description Code p 65 000 BUSY Previous command still in progress 65 111 ERROR Nota legitimate command or Command can not be processed bec
8. www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con communicate with two slaves at addresses 20 and 3A 32 and 58 decimal on the ifc bus If the bus to which the Model 400 is attached has an active slave at either of these addresses undesirable results are almost certain To disable master write attempts bit 4 of the mode byte see Table 9 must be cleared using the M command To leave the Model 400 in its factory configuration but without the expansion board enabled send the M command with a parameter value of 17445 decimal I c Data Format The data formats described in this section refer only to the data portion of the i c packet The correct c header byte consisting of the unit s ifc address and the read write bit is assumed to precede the bytes shown in the tables Command packets The Model 400 ifc interface is in slave mode at address 60 or the last address specified with the A command expecting data packets of up to 3 bytes in length as shown in Table 5 below Directive commands have a single parameter which is always a positive integer less than 65 536 decimal The meaning of the numeric parameter depends on the command to which it is attached For query commands that do not accept parameters the 2 880 bytes are ignored and ne
9. 0W with 12 V input Sensor Module with Expansion Board Power Requirements 12 36 VDC 10 28 VAC Optional Digital Display 4 digit 50 LCD displays concentration to 01 Alarms field adjustable high and low alarm SUNSTAR thresholds contact closure N O or N C user selectable contacts are rated at 1A 24V visual indicator tri color LED indicates low alarm normal and hi alarm conditions voltage 0 to 1 volts linear http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con SENSOR MODULE This section describes the installation and operation of the Model 400 sensor module in the stand alone configuration where it is connected directly to the end user s equipment Mechanical The mechanical dimensions of the Model 400 sensor module are shown in Figure 1 The volume of the sample cell is 0 037 cubic inch 0 61 63 incl parts clearance cubic cm Two configurations 410 S Il th of the sensor module wi er ok ech Lk are available The diffusion version is intended for measuring the concentration levels in the space immediately surrounding the sensing cell The sample draw version is intended for measuring the concentration of a gas stream that passes through the sensing cell The sensor is operational in any orientation but a mounting
10. 20G 63 con
11. 63 con Name 1 0 1 volt Voltage is linearly 3 Vout measurement proportional to gas output concentration 2 Logic level PWM PWM duty cycle is PWM measurement linearly proportional output to gas concentration 3 Measurement Should be connected 4 GND system ground to users analog GND connection for best results e ee en tie SCK R clock communication ine oe person eee 7 when low programming pin this pin ae source relative to pin 10 Current return pin Connect as directly IR GND for IR source as possible to power supply Regulated 5volt For user 5 Out output accessories limited to 10 mA oer use KGK not connect 13 p d 7 5 15 Gle DC input ower l system power relative to pin 3 o 14 Serial interface For i C bus data pin icati communication Table 3 Sensor Module Connector Pinouts SUNSTAR O O http www sensor i c coni TEL 0755 83376489 FAX 0755 83376182 E MI L szss20 63 con SUNSTAR O 0000 http www sensor i c con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con perating Power Requirements Separate pins are provided for IR source and circuit power inputs The IR source draws about 100 mA at a 50 duty cycle The rest of the circuit draws a steady current of under 5 mA Normally the two power inputs R power and Power as well as the two grounds are internally connected so that the sensor can be powered with a two conductor cabl
12. E S OW 19 User Adjustable Parameters 2 211111122 20 Disclaimers and NolicesS uuuuuunaa aaa aaa aaa aaa aaaaa 21 Safety Critical Applications uuaaaaaaaaananaaa 21 Limited Warranty and Remedies 21 3 13 07 Digital Control Systems Page iii SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con INTRODUCTION The model 400 is a 2nd generation gas sensor for measuring carbon dioxide concentration Advanced design provides a very stable drift free output to provide one of the most accurate low cost CO measurement systems available today The Model 400 s dual beam optics provide a sensor highly resistant to drift The dual beam principle uses a second wavelength of light that is outside the absorption band of interest to null out any changes in intensity of the source Any source drift will affect both the reference and measurement wavelengths and be canceled out by the signal processor The Model 400 also incorporates an improved temperature compensation system that cancels out not only temperature sensitivity in the measurement system but compensates for thermal shifts due to gas law effects The basic Model 400 sensor module is a cost effec
13. SUNSTAR O 0 0 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con MODEL 400 CO2 CONCENTRATION SENSOR USER S MANUAL DIGITAL CONTROL SYSTEMS 7401 SW Capitol Hwy Portland OR 97219 USA 503 246 8110 503 246 6747 fax www dcs inc net 2007 SUNSTAR O O http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MI L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con Revision Date 3 14 02 10 23 02 6 3 04 5 9 05 8 8 05 1 16 06 3 13 07 03 18 09 11 2 2011 SUNSTAR O O http www sensor i c coni TEL 0755 83376489 FAX 0755 83376182 E MI L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con Model 400 CO Concentration Sensor TABLE of CONTENTS INTRODUCTION eeueeeaa aaa aaa aaa aaa aaa eee aaaaaaaaaaeaaaaaaaaa 1 SPEGI IGAWNONSK weak RA A 2 SENSOR MODULE zes i aa EG 3 NIEGHA ICAlea s EO a O A PASE 3 Diffusion Style Sensor ss eeeeaaaaaaaeea 3 Sample Draw Sensor e eaaaaao e eenaaaaaaaa 4 Pumped Sample Draw Considerations 4 Measurements at High Humidity ccccseceeeeeeeeeees 4 Electrical Connections sseoeo aaa aaa aaa aaaaaaaaaaaaaaaaa 5 Mating CORNSCIOTE aso aw 6 Operating Powe
14. ause it is blocked by mode setting 65 222 FAIL M400 Unit EEPROM failed Table 7 Error Codes Implemented Commands Table 8 shows the Model 400 s command set Directive commands that require a positive integer parameter have a D in the class column Query commands that return data have a Q in the class column The function of most commands is clear from the descriptions in Table 8 The more complicated commands are explained in greater detail below A Address Command The A command is used to change the i c slave address to which the Model 400 responds This is the only command that does not generate a response B Command The B command is used to set response time to a step change in gas concentration Default value is 32 Lower values reduce the response time but make the CO reading noisier The parameter range is from 1 to 40 corresponds to response time from 3 sec to 23 sec Land K Commands These two commands can be used to define a limited CO concentration range over which the analog and PWM reporting SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con signals respond Both parameter values are percent CO times 100 The parameter to the J command defines the CO concentration below wh
15. e The additional pins are provided for flexibility in connection to the end use equipment Maintaining adequate power supply voltage is critical voltages below 7 5 volts will result in erroneous readings Split Power Supply For specialty applications where the large fluctuating current for the IR source must be supplied from a separate source the sensor can be supplied with the two power and ground inputs electrically separate In this configuration both power pins 9 and 13 must be connected to DC sources of 7 5 to 15 VDC and the two grounds R GND and GND must be electrically connected Improper connection of power can potentially damage the sensor Behavior at Power Up The Model 400 performs a checksum test of its non volatile memory at startup If a checksum error is detected the unit will not start normal operation but instead 1 The analog output is at its maximum value slightly above 1 0 volts 2 All reads of the i c interface will return the error packet with error code of 65 222 decimal 3 If the expansion board is attached the display will show Err SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con MEASUREMENT AND CONTROL INTERFACE The Model 400 interacts through several interfaces The simplest is the analog
16. e button s as indicated in the table and close the MODE jumper The LED will go out when the parameter setting mode is enabled and the display will indicate the value associated with the parameter to be adjusted If the parameter was selected by holding down one or both buttons the LED will not go out until the button s are released Adjust the parameter using the UP amp DOWN buttons When the desired value has been set open the MODE jumper to return to normal operation Parameter Button s or Display Comments J umper s s to Shows select es Gas bothUP6 Measured Adjust display to read measurement DOWN CO cal gas concentration cal buttons Analog span UP button 20 0 Adjust output voltage default to correspond to default concentration alarm limit _limit value Bc LP al alarm limit limit value FAIR Setpoint setpoint Table 10 Selecting Parameter to Adjust SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR DOD http www sensor i c con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con DISCLAIMERS AND NOTICES Safety Critical Applications DCS products are not designed intended or authorized for use in life safety systems or devices where failure of the Model 400 to perform to specification may be reasonably expected to result in significant risk of injury or death Lim
17. e corresponding control line When they are not being used all three control lines must be kept disconnected or driven to logic high levels Calibration Modes Three calibration parameters can be adjusted measurement system calibration analog output span and analog output zero In all cases the operation of calibration is the same the UP and DOWN pin logic levels are set to indicate the desired parameter to calibrate See Table 4 and the MODE pin is held low to enable that calibration A half second or more later the UP amp DOWN pins can been released and then begin operating as up or down adjustments to the calibration value A momentary low going pulse on the UP or DOWN pin will move the value one internal unit while holding the pin button low will cause the value to accelerate in the desired direction See note on pin timing above when driving the control lines with a processor SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con Once the parameter has been adjusted to the desired value the MODE pin is returned to logic high causing the sensor to resume normal operation No calibration normal display mode L L Calibrate Gas Measurement System single point user gas calibration 0 target value is 1 00 V ea target value
18. ed not but may be sent Any additional bytes will be accepted then discarded by the i interface Byte Description _ see Table 8 on page 15 Table 5 iC Command Packet Format Response Behavior The sensor can be queried or directed by an i c master using standard ifc slave reads and writes As soon as a directive or SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con query command has been received the interface responds to subsequent reads with one of the following response packets 1 appropriate response data for previous command 2 busy response an error packet with error code 65 000 decimal to indicate that the command is still being processed and the output is not yet ready 3 error response an error packet with error code 65 111 or 65 222 decimal to indicate other errors see table 6 The interface always returns a response packet for the most recent command received For example after a C command has been sent subsequent CO2 readings can be requested by simply reading the sensor without having to first send a query command A master can request a response immediately by issuing a restart followed by the read request but most commands except C P and T need some time to be processed and
19. ich the reporting signal will always be zero The parameter to the K command defines the CO3 concentration above which the reporting signal stays at its maximum value The reporting signal responds linearly between the two values _Omnd Description Class A Set new ifc address For example A62 sets ifc address equal to 62 NOTE This command has no response PE response time in arbitrary units to a kd Gl KANE in gas concentration C Return current CO reading in percent x100 For example returned reading 1000 means 10 00 C0O Set starting CO2 for analog output Set max CO2 for analog output M Set mode word value See Table 9 for bit assignments FE Return raw detector power reading in arbitrary KA units LQ Return serial number Q Calibrate Parameter is known applied gas concentration x100 For example U500 adjusts reading to 5 00 NOTE This command needs up to 1 minto be processed Return temperature in arbitrary units Q Table 8 Digital Interface Commands When shipped from the factory the J parameter value is 0 and the K parameter value is 2000 This implies that the reporting signal varies linearly from 0 to its maximum value as the concentration increases from 0 to 20 To make the concentration reporting signal remain at O until the gas concentration reaches 3 then rise linearly and reach full SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182
20. in a convenient location The sensor is connected with flexible tubing through a pump to the volume to be measured Pumped Sample Draw Considerations To avoid excessive pressure build up in the sensing cell place filters or other flow restricting devices upstream of the sample cell between the pump and sensor In very high flow systems a shunt tube should be provided to avoid turbulence in the sample chamber that may cause unstable readings when the flow rate exceeds 25 l min 0 5 ft Hr Whenever possible the sensor should be installed so that the sensing chamber is at positive gauge pressure so that any leaks discharge sample gas rather than drawing in ambient air and altering the concentration of the sample gas When sampling high humidity gas the detector chamber temperature must be kept above the dew point of the sample stream to avoid condensation Any moisture condensing in or carried into the sensing cell by the sample stream will cause measurement errors Figure 2 Detector Mounting Dimensions Measurements at High Humidity The Model 400 is designed to operate in high humidity environments up to and including 100 RH But it is critically important to keep liquid water i e condensation out of the SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szs
21. ins 1 amp 2 of the main connector These control lines are active low internally pulled up TTL level logic input lines The inputs are referenced to the GND pin SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con TTL control When driven by an active source the applied voltage on these control lines must never go below ground or above 5 volts Logic low voltage is less than 1 volt logic high voltage is between 4 5 and 5 0 volts When the control lines are being driven by a processor the following setup times must be observed 1 The UPand DOWN pins must be held stable for 10 mS before the MODE pin is brought low and cannot be released for 500 mS after MODE goes low 2 While adjusting values the UP or DOWN pin must be held low for 1 mS minimum to be debounced 3 UP or DOWN pin held low for greater than 500 mS will begin stepping the calibration in the appropriate direction The rate of stepping will increase every few seconds Switch Control The control lines can also be used as switch inputs Each control line is at logic high when not connected and at logic low when connected to ground The simplest contact closure interface implementation connects each control line to a normally open switch to ground Closing the switch then asserts th
22. ited Warranty and Remedies Unless otherwise stated DCS warrants to Buyer that for two years from the date of shipment of Products to the Buyer that Products will substantially conform with the product specifications agreed to by DCS This warranty is not transferable This warranty does not cover gt Defects due to misuse abuse or improper or inadequate care service or repair of Products gt Defects due to modification of Products or due to alteration or repair by anyone other than DCS or gt Problems that arise from lack of compatibility between DCS Products and other components used with those Products or the design of the product into which Products are incorporated Buyer is solely responsible for determining whether Products are appropriate for Buyer s purpose and for ensuring that any product into which Products are incorporated other components used with DCS Products and the purposes for which DCS Products are used are appropriate and compatible with those Products THE WARRANTY IN THIS SECTION IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED DCS EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE DCS IS NOT RESPONSIBLE IN ANY WAY FOR DAMAGE TO A PRODUCT PROPERTY DAMAGE OR PHYSICAL INJURY RESULTING IN WHOLE OR IN PART FROM 1 IMPROPER OR CARELESS USE 2 UNAUTHORIZED MODIFICATIONS OR 3 OTHER CAUSES BEYOND DCS CONTROL IN NO
23. nector end of sensor module showing OEM amp main connectors SUNSTAR O O http www sensor i c coni TEL 0755 83376489 FAX 0755 83376182 E MI L szss20 63 con SUNSTAR O00 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con Mating Connectors The Model 400 is supplied without mating plugs for the two connectors The mating plug for the OEM connector is a female in line 5 position 0 1 pitch 025 square pin receptacle An IDC insulation displacement connector style is recommended for ease of cable fabrication Part numbers for several vendors are shown in Table 1 ITW Pancon PN AMPPN Description _ 5 position IDC connector for CE100F26 05 640442 5 26 AWG wire 5 position IDC connector for CE100F24 05 640441 5 24 AWG wire Table 1 Mating plugs for OEM connector The mating plug for the main connector is a female 2 x 5 0 1 pitch DIP dual in line pin socket An insulation displacement style ribbon cable connector is highly recommended Part numbers for several vendors are shown in Table 2 050 010 455A 746285 1 10 position IDC connector for 26 or 28 AWG flat cable Table 2 Mating plugs for main connector SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR O 0 0 0 http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G1
24. r Requirements 8 Split Power SUPPy cc eeeeececeeeeeeeeeeseeeeeeeeees 8 Behavior at Power Up s seeseesseeeeeeeeeeeeeeeeeeeeeees 8 Measurement and Control Interface 2 1 1111 9 Analog IniefacCe ewa alek daa 9 Contact closure interface s eesueuaaaaaaaaananaaa 9 W TECORNOlE o Rd R A ne KO A slot ees 10 Switch Control sssaaa aaa ooo aaa aaa aaaaaaaaaaaaaaaaaaa 10 Calibration Modes eeeeeu aaa aaa aa aaaaaaaaaaaaaa 10 PWNKOUIDU ZE A EPO AA BR 11 Command interface wasi ia A a ia asi 11 Master mode and the Expansion Board 11 ke Data Fomai enea 12 Command packets seesasenenaaaaaa 12 Response Behavior 2 susau22 12 Response Packet Format 22211 13 Implemented CommanQs ssssuuanaaaaae 14 A Address Command 2 22111112 14 B Command ei OO rnn 14 J and K CommanQS sssseeeeeeezzzacz 14 M Mode Command cccceeeeeeeeeseeeenteeees 16 P and T COMMANdS aa toz a OCZNA OW 16 Expansion BOA skad Ea ai 18 Power SUD DRY maska OKO ORA 18 Digital BEPISYE eldo OO 19 G rrent Outp t z oO A adas 19 High Limit Contact Closure 22221 1 22 19 ARMS kaz OOO ADA O
25. return the internal values corresponding to the raw detector power and raw temperature sensor values SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con respectively The units for these values are completely arbitrary and uncalibrated The same value from two different units does not necessarily mean that the underlying values i e temperature or detector power are the same or even close After each calibration the relationship between detector power and indicated gas concentration is altered These commands are intended primarily for factory and service diagnostic use Their usefulness during normal operation is limited SUNSTAR 0 http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR DIDD http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con EXPANSION BOARD The Model 400 expansion board shown in Figure 5 adds a display a button and jumper control panel alarm functions wider range power supply and current loop analog output JUMPER JP1 UP BUTTON LED DOWN BUTTON MODE JUMPER RELAY POLARITY MEASUREMENT OUTPUT 32 0450 00 RELAY CONTACT ANALOG OUTPU SELECTO POWER CURRENT LOO OFFS CURRENT
26. s20G163 con sensing cell Liquid water strongly absorbs IR radiation at the same wavelengths as COs so even very small water droplets anywhere in the sensing cell will cause erroneously high gas concentration readings In diffusion sampling systems ensuring that the sensing cell is always above the dew point of the monitored gas suffices to keep water out of the sensor In sample draw systems condensation can occur at any point in the sample stream s path where the temperature is below the dew point of the sample stream Once condensation has occurred the liquid water droplets can be carried into the sensor by the moving gas and cause measurement errors even if the sensor itself is at or slightly above the dew point Electrical Connections All electrical connections to the Model 400 sensor module appear on the 14 pin shrouded DIP connector at the back end of the module s circuit board A subset of these connections also appears on the 5 pin OEM connector The locations of the connectors and the pinout of the OEM connector are shown in Figure 3 The pinout of the main connector viewed from the back with the circuit board components facing down is shown in Figure 4 The pinouts of both connectors are summarized in Table 3 o IR GND 5 GND 4 e O Vout 3 IR POWER POWER 1 OEM CONNECTOR Figure 4 Model 400 Interface Connector Pin Numbers MAIN CONNECTOR Figure 3 Top view of con
27. tive measurement component for a variety of scientific and industrial products All power control and signal connections to the module are via a single cable Applications that require a wider range of acceptable power supply voltages a physical control connection panel local display of concentration set point relay and or a current loop measurement output can be accommodated with the expansion option The Model 400 is available in two basic versions a bulkhead mounted configuration intended primarily for measuring CO2 concentration in enclosed spaces and with hose nipples as shown on cover for pumped sample draw applications SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR O http www sensor ic con TEL 0755 83376549 FAX 0755 83376182E MN L szss20 163 con SPECIFICATIONS Non dispersive infrared NDIR dual wavelength detector 0 20 CO Default 20 sec see B command page 14 95 response to step change 1 of full scale Accuracy 5 of reading or 0 1 COs whichever is greater Repeatabilit better than 0 1 CO Linear 0 1 volt Logic level pulse whose width is linearly proportional to CO concentration Operating Temperature 0 50 C Operating Humidit 0 100 RH non condensing Storage Temperature 20 to 70 C Power Requirement 7 5 15 VDC 170 mA max 125 mA AVG Approx 1
28. will result in low reading errors at higher concentrations High Limit Contact Closure The optional contact closure provides a dry i e unpowered contact at the two terminals of the RELAY CONTACT terminal strip The set point is adjustable over the full range of the unit as described in the User Adjustable Parameters section below The polarity of the relay is adjusted with the RELAY POLARITY jumper as shown in Figure 5 In the NO position the relay is open below the setpoint In the NC position the relay is closed below the setpoint Relay contacts are rated at 2A and 24V Alarms The alarm LED indicates three CQ levels e LED Yellow co2 level below Lower Alarm set point default value 4 50 CQ e LED Green co2 level between Lower and Upper Alarms default values 4 50 C0 and 5 50 C02 e LED Red co2 level above Upper Alarm set point default value 5 50 CQ SUNSTAR http www sensor i c con TEL 0755 83376489 FAX 0755 83376182 E MN L szss20G 63 con SUNSTAR TU O0 O http www sensor i c con TEL 0755 83376549 FAX 0755 83376182E MN L szss20G163 con User Adjustable Parameters The parameters shown in Table 10 below are adjustable using the buttons and jumpers on the expansion board To change a parameter proceed as follows 1 2 Select the parameter to be adjusted from Table 10 on page 20 Close the jumpers or hold down th
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