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PAGE 27

9. REPLACEMENT PARTS

Part

Number Description

253-0355

Sensor Board

270-0138

CO

Sensor

Cell

Assembly

125-0160

Enclosure

(MC-4231)

066-0009

LCD

Display

270-0111

Test/Calibration

Switch

150-0177

6

Position

Terminal

Block(Back

Plate)

037-0028

Sonalert

270-0133

LED

Permissible

Visual

Alarm

Assembly

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Summary of Contents for MC-4231

Page 1: ...PAGE 1 MC 4231 CO MODBUS ADDRESSABLE SENSOR Manual Part Number 180 0547 November 28 2001...

Page 2: ...ches 11 3 8 Setup Adjust 11 3 9 Zero Adjust 11 3 10 Reference Adjust 12 3 11 Comm Fuses 12 4 Configuration 13 4 0 General 13 4 1 Current Loop Mode Sensor Stand Alone 13 4 2 Voltage Mode Sensor Stand A...

Page 3: ...Output 2 Connections 20 5 8 Calibration Test Switch Connection 20 5 9 2 Wire Monitor System Connection 20 5 10 4 Wire Monitor System Connection 20 6 Calibration 23 6 0 General 23 6 1 Zero Calibration...

Page 4: ...Figure 3 Stand Alone Voltage Mode Connection to Monitor System 17 Figure 4 Stand Alone Voltage Mode Sensor in Permissible Area 18 Figure 5 MC 4231 CO Monitor Connection 21 Figure 6 2 Wire Addressable...

Page 5: ...ase of high carbon monoxide levels 1 1 Features The features of the MC 4231 CO Modbus sensor are summarized below Low current operation Less than 3 ma May be used in permissible areas with like type c...

Page 6: ...e features of the earlier MC 4031 model and many more Listed below are the new features of the MC 4231 CO sensor One PC board for both sensor and communications instead of two Three rotary BCD switche...

Page 7: ...ale Range Dip Switch Selectable 25 ppm or 50 ppm Calibration Gas Dip Switch Selectable 25 ppm or 50 ppm Display Four Digit LCD Detection Principle Diffusion Type Electro chemical Trip Outputs Open Col...

Page 8: ...PAGE 8 FIGURE 1 CONNECTION AND CONFIGURATION DIAGRAM 2 WIRE POSITIVE 2 WIRE COMM COMM ENABLE DS6 POSITION 19 2KBAUD RATE NOT USED VOLTAGE MODE...

Page 9: ...F ZERO OFFSET VALUE IF PROVIDED OFF OFF NOT USED NOW Notes 1 The zero offset value function is provided as an option to the user by using special software The user must request this software 2 The MC...

Page 10: ...o set one of these values place DS1 6 switch to the OFF position The display will now read the current value given by the Setup Adjust potentiometer Figure1 The value idicated will be the previously u...

Page 11: ...OL voltage CUR current Note The MC 4231 CO may not be used in the Current Mode DS6 IS HARDWIRED FOR VOLTAGE MODE OPEN 3 7 Address Switches Rotary BCD switches BS3 BS2 and BS1 set the monitor address f...

Page 12: ...t Reference Adjust R32 is FACTORY SET ONLY It is used to match the different types of sensor cells to the MC 4231 electronics Note This should not be user adjusted 3 11 Comm Fuses Communication Fuses...

Page 13: ...witches to allow the MC 4231 CO monitor to perform the different functions 4 1 Current Loop Mode Sensor Stand Alone Note The MC 4231 CO monitor is shipped configured for Voltage Mode Operation The MC...

Page 14: ...e monitor as described in the INSTALLATION section Set these switches as follows JUMPER FUNCTION POSITION DS4 COMM ENAB DISAB ENABLE 1 5 2 3 DS6 MODE SELECT VOLTAGE OPEN DS3 2 4 WIRE SELECT 2 WIRE 2 4...

Page 15: ...rface The monitor uses City Technology sensor cells and will accept both 2 wire and 3 wire type cells The monitor may also be used as a monitor system small remote In addition to the 100 milliampere c...

Page 16: ...ay be installed in a variety of configurations to accomplish different monitoring functions Use Figure 1 and Figure 2 as reference for making connections in the following discussion of all the monitor...

Page 17: ...10 VDC to 28 VDC Connect the side of the voltage source to connector J1 1 V Connect the side of the voltage source to connector J1 3 RTN If the voltage output is used connect it to J1 2 VOT FIGURE 3...

Page 18: ...the barrier to the MC 4231 CO monitor as shown in Figure 4 Use the correct barrier classification types and use shielded cable between the remote barrier and the MC 4231 CO monitor FIGURE 4 STAND ALON...

Page 19: ...ect the side of both the audible and visual devices to 28 VDC Connect the side of the LED cluster to J1 7 WRN Connect the side of the Sonalerts to J1 8 ALM 5 4 Alarm Reset Switch Connection A push bot...

Page 20: ...of the power source 28 VDC or less Connect the side of the device to be controlled to either J5 5 1 output or J5 7 2 output Connect the RETURN of the power source to either J5 6 1 output or J5 8 2 ou...

Page 21: ...1 2 3 4 1 2 3 4 DATA LINE 20 VDC BARRIER 1 2 CLASS J DUAL CIRCUIT MTL 768 NOTE CABLE CONNECTIONS FROM BARRIERS TO SENSORS MUST BE SHIELDED 12 AWG GND WIRE MINIMUM PERMISSIBLE AREA FIGURE 5 MC 4231 CO...

Page 22: ...ALARM TX RX FIGURE 8 4 WIRE ADDRESSABLE MONITOR THRU BARRIERS BLUE REMOTE TX LINE 20 VDC BARRIER 1 BARRIER 2 MC 4231 CO 1 2 3 4 1 2 3 4 RX LINE 20 VDC BARRIER 1 2 3 CLASS J DUAL CIRCUIT MTL 768 NOTE C...

Page 23: ...operator 3 minutes to properly perform the SPAN calibration 4 Remove the magnet from the CAL TEST switch 5 During ZERO calibration of the sensor electronics the unit evaluates the amplified gas senso...

Page 24: ...electronics the unit evaluates the amplified gas sensor cell output to determine that the value is between 1 50 VDC and 3 00VDC at the test point TP1 If the voltage is not between these two values a s...

Page 25: ...e display reading 2 The LCD display will show the following values in the order below a SPAN calibration value b Monitor Electronics Test value slowly rises to 20 PPM c WARN trip level Factory set to...

Page 26: ...ltage Mode Section 4 2 page 13 Switch DS1 3 to OFF Section 4 2 page 13 Connect Power Section 5 1 1 page 17 If the monitor function is a system monitor perform the following Hardware Jumper DS4 to Comm...

Page 27: ...on 253 0355 Sensor Board 270 0138 CO Sensor Cell Assembly 125 0160 Enclosure MC 4231 066 0009 LCD Display 270 0111 Test Calibration Switch 150 0177 6 Position Terminal Block Back Plate 037 0028 Sonale...

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