Model 305e Manual - Digital Control Systems, Inc.
Contents
1. At this point the DOWN jumper is opened to make it available for altering the value Momentarily closing either the UP or DOWN jumpers causes the display to show the current elevation setting in feet and the analog output voltage sets to the corresponding value 1 mV 4 feet Subsequent closures of the UP or DOWN jumpers increment or Last Rev 3 11 15 page 8 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual decrement the elevation value After about 5 seconds of no jumper closures the Model 305e exits this mode and returns to normal operation Relay Set Point To view or alter the setpoint close JP3 to make display show r SEL then momentarily close either the UP or DOWN jumper to show the current relay setpoint in ppm CO The UP and DOWN jumpers can now be used to adjust the displayed relay setpoint to the desired value Opening JP3 stores the new relay setpoint value and returns the unit to normal operation Relay Hysteresis To view or alter the relay hysteresis close JP3 to make display show T SEL then momentarily close JP1 to show the current relay hysteresis The UP and DOWN jumpers can now be used to adjust the displayed relay hysteresis to the desired value Analog Calibration This calibration ONLY adjusts the scaling of the analog output voltage It is not intended for primary ca2. very compact cost effective low power module for measuring ambient CO levels Designed for imbedded applications it operates from a single 5 volt DC supply and reports CO2 concentration results as an analog voltage or digitally over an industry standard 3 wire serial bus A TTL level logic relay signal is also provided which is high when the CO concentration is at or above the user adjustable relay setpoint Elevation calibration is also provided Specifications Measurement Method Non dispersive infra red NDIR 5 of reading or 100 ppm scaled at 1mV ppm CO Digital Interface bi directional SPI Operating Power Requirements 4 75 to 5 25 VDC 05 Amps average Operating Temperature Range 0 to 50 C Operating Humidity Range 0 to 95 RH non condensing 0 75 tall adjustable hysteresis Last Rev 3 11 15 page 4 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual Mechanical The mechanical dimensions for the Model 305e are shown in Figure 1 to the right The breakaway section on the right maintains the Model 305e mechanical spacing and mounting hole pattern is Breakaway Section ame provided for legacy A Cell Clearance applications This section can 0 750 2 Pa be snapped off and discarded 0 450 A Yj Connectors 0 150 for a smaller footprint MMMM Note
3. with the analog output set to vary between 0 and 2 5 volts as the concentration varies from 0 to 2500 ppm CO2 Digital Interface The digital interface appears at the 7 position harmonica connector as shown in Figure 2 It implements a Motorola style bi directional SPI bus Logic levels are 0 and 5 volts The pin assignments on J3 are shown in the table below 1 Select When high serial bus data is intended for this port 2 Serial Data Out SDO SPI output data from Model 305e Serial Clock SCK Clock that synchronizes data on SDI CE SDO lines FE volt power for external 5 volt power for external application SS Ground reference for all digital bus signals and current return for 5 volt power 6 sSerialDatam SPI input data to Model 305e Table 1 Digital Interface Connector J3 Pinout This interface can be used to deliver measurement results to a host system as well as controlling the Model 305e operations Application specific configurations can be implemented to suit customer requirements The SPI bus can operate in master mode for continuous updates or in slave mode where it must be queried by the application The standard firmware uses this port to communicate with an optional LED display module that normally shows the detected concentration in Last Rev 3 11 15 page 6 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual Operator Int
4. Model 305e OEM CO concentration sensor Reference manual DIGITAL CONTROL SYSTEMS 7401 SW Capitol Hwy Portland OR 97219 USA 503 246 8110 4 503 246 6747 fax www dcs inc net Revision History Date 11 11 2005 3 16 2006 1 21 2007 3 8 2007 3 16 2008 3 11 2015 DCS Model 305e user s manual Table of Contents Revision History ccesccesecsceeceesceeseeeeceeeeceaecaecsaecaeecaeeeneeeneeneeeeeees 2 COOP ete ene Leas 4 tre Le e EE 4 eat A WEE ET 5 El ctrical Connect ons sis eriseeria oare teaa eeN SEEE E E Ei 5 Operating POWER gege iere a 5 Analog Measurement Oummut eee cece cece cseeeeeeeeeeeeeeeeeseensees 6 Disital Ee E 6 Operator Interface erleben 7 Using Jumper Functions vecii nevertinti nieni nis 7 Measurement Calibration UP 8 Elevation Cotrecten 2 HB ngnkekssksnn 8 Relay Set Pont are 9 Relay Hysteresis nne una 9 Analog Calibration ienne asia 9 Analog Output Offset Adj JP4 amp JP3 nseeensesnennenennn 9 Analog Output Span Adj JP4 amp JP5 oeeo 9 Last Rev 20111 page 3 oF Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual Scope This document applies to the 01 and higher circuit board revisions The part numbers 32 0133 01 or 32 0133 02 in the lower left hand corner of the circuit board identifies these units Introduction The DCS Model 305e is
5. erface The operator interacts with the Model 305e using seven contact closure pairs as shown in Figure 2 The five pairs labeled 1 through 5 implement JP1 through JP5 respectively The two contact pairs labeled UP and DOWN function like UP and DOWN buttons that are momentarily closed to simulate the action of push button switches A small 1 8 wide blade screwdriver is a handy tool to use for momentary contact closure The operator interface is used to query and alter internal parameters A jumper pair is typically closed with a shorting block to select the parameter to be accessed The button pairs are then momentarily closed to alter the value Shorting blocks can be conveniently stored by placing them over only a single pin of a jumper Using Jumper Functions Several of the five 2 pin jumpers are used to view and adjust parameters as shown in Table 2 below Placing a shorting block over the two pins corresponding to the jumper number closes that jumper Functions are accessed by placing a shorting block on the jumper indicated in the table below For some parameters a second jumper must be momentarily closed after the shorting block is placed on the first jumper If the optional display is connected most functions will show a characteristic string in the display to identify the selected function In the case of relay hysteresis the current value is immediately displayed To change the value m
6. libration of the gas measurement system Calibrating the Analog output is a two part process First close JP4 with a shorting block This shows SEL on the display Then momentarily close a jumper to select offset or span calibration JP3 allows adjustment of Low cal point display reads Lo JP5 is for calibration of the high cal point display reads Hi Analog Output Offset Adj JP4 amp JP3 With JP4 closed momentarily close JP3 to force the CO measurement system to report 0 ppm The UP amp DOWN buttons are used to adjust the offset of the analog output to the desired value at 0 ppm If the LED display is connected it shows Lo when jumper 3 is closed Analog Output Span Adj JP4 amp JP5 With JP4 closed momentarily close JP5 to force the CO measurement to report full scale concentration regardless of the actual gas concentration at the sensor The UP amp DOWN buttons are used to adjust the span of the analog output to the desired value at full scale If the LED display is connected it shows Hi when jumper 5 is closed Last Rev 3 11 15 page 9 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110
7. omentarily close the UP or DOWN jumpers to increment or decrement the value When the desired value is being displayed remove the shorting block to restore normal operation Some modes will reset the unit after the jumper is removed Last Rev 3 11 15 page 7 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual Jumper Shorting Manual user calibration at any gas concentration Relay Setpoint 1000 ppm JP3 pi Relay hysteresis ER a Offset pe AA Span Elevation 0 feet sea Correction level Table 2 Accessing User Alterable Parameters Measurement Calibration JP2 When calibrating the model 305e make sure that the detector has stabilized at the concentration to which the measurement system will be calibrated before closing jumper JP2 When jumper JP2 closed the display reads U CAL and the measurement system verifies the reading for about 45 50 sec to make sure that the gas concentration is stable After about 50 seconds the display switches to read CO2 concentration in ppm with decimal point following forth digit and is ready for adjustment With jumper JP2 still closed the UP amp DOWN jumpers are used to adjust the displayed CO concentration to the desired value Elevation Correction Closing the DOWN jumper for 5 seconds or longer enters the elevation setting mode If the display is connected it will show ELE
8. the clearance requirements SL shown in Figure 1 For tight fitting applications the clearance above the board can Figure 1 Model 305e Mechanical be reduced to 46 by using Dimensions parallel connectors Contact the factory for details AL Under Board Clearance The four holes in the corners are intended for 4 mounting hardware Electrical Connections Operating Power The Model 305e s operating power is supplied through the two 025 square pin 1 pitch harmonica connector located as shown in Figure 2 Power requirements are 5 0 25 VDC at 50 mA average The POWER INPUT current waveform 1 CONNECTOR alternates between 20 rs det and 80 mA at a 50 ime i DIGITAL duty cycle E ln CE be Buttons If the optional LED display is connected the current draw will increase Figure 2 Model 305e Parts Locations Last Rev 3 11 15 page 5 of 9 Digital Control Systems e 7401 SW Capitol Hwy e Portland OR 97219 e 503 246 8110 DCS Model 305e user s manual Analog Measurement Output The measured CO concentration is reported as a voltage that varies linearly as a function of detected concentration The negative terminal of the analog output is electrically connected to the operating power ground The offset and gain of the analog signal output are adjustable with the jumpers and buttons as described in the Jumper Functions section Unless otherwise specified the units are shipped
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