Related Manuals for Dwyer Instruments CMT Series
Summary of Contents for Dwyer Instruments CMT Series
- Page 1 SERIES CMT CARBON MONOXIDE GAS TRANSMITTER INSTALLATION OPERATION AND MAINTENANCE MANUAL DWYER INTRUMENTS, INC. PO BOX 373, MICHIGAN CITY, IN. 46360 USA PHONE: 800-872-9141 FAX: 219-872-9057 Web: www.dwyer-inst.com...
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Page 2: Default Settings
Operation And Maintenance Manual CMT Configuration: Default Settings Factory User Settings Settings Signal 4 mA See Table Below ________________ 20 mA See Table Below ________________ Password 0017 ________________ Relay 1 Actuation Enabled ________________ Relay 1 Setpoint (Actuation) See Table Below ________________ Relay 1 Release Point See Table Below... -
Page 3: Table Of Contents
Operation And Maintenance Manual Table Of Contents Default Settings............................1 PRINCIPLES OF OPERATION......................3 .............................3 ISPLAY ..................3 EYPAD AND UNCTION ONFIGURATION ............................4 ASSWORD ..........................4 UTPUT IGNALS ............................4 ETER ACKS ......................4 IGNAL AND ISPLAY ANGE .......................5 PTIONAL ELAY ACKAGE ........................5 EFAULT ONDITIONS .......................5 ENSING AND ALIBRATION 1.9.1... -
Page 4: Principles Of Operation
Operation And Maintenance Manual CMT Operating Manual 1. Principles of Operation Figure 1 CMT Internal View - Features 1.1 Display The display module is a 2-line by 8-character LCD. Standard reading in operation is Gas Type xxx Units 1.2 Keypad and Function Configuration Relay settings and other configurable items are accessed through the keypad and menu display. -
Page 5: Password
Factory preset default password is 0017. Password can be changed. RECORD PASSWORD IN A SECURE PLACE. If the password is lost, the unit must be returned to Dwyer to be reset 1.4 Output Signals Options are 4-20 milliamp or 2-10 VDC linear. Choose the option by moving the jumper on JP3. -
Page 6: Optional Relay Package
Operation And Maintenance Manual Display Range is the range of concentrations the unit is capable of displaying (which is the same concentration it will report on the digital communications). The display range varies with the gas type. Signal Range is the assignment of the 4 to 20 mA signal. Default assignment of 4 mA is zero concentration. -
Page 7: Function And Configuration
Operation And Maintenance Manual 2. Function and Configuration 2.1 Menu Structure and Use Note: While the keypad functions are available without opening the case. It is necessary to open the case to apply the calibration gases. The ‘keypad’ switches are located in the upper right side of the enclosure. -
Page 8: Configuration And Calibration
Operation And Maintenance Manual Note: Should the concentration equal or drop below an internal value, the unit will flash "CALIBR" on display line 2 every 8 seconds. Menu Activation: Press and hold any key for 3 seconds to enter the menu tree. Menu Scrolling: Use the scroll buttons to scroll up and down through the menu tree. - Page 9 Operation And Maintenance Manual Password Control PASSWORD 0000 * Press up/down to choose correct password and accept. Factory Settings Sub-menu Branch FACTORY Settings This function is for factory setup and test only. Relay 1 Sub-menu Branch RELAY 1 Settings Press Enter to proceed to the Relay 1 Settings sub-menu (press down/up to skip Relay 1 Settings and go to next/previous menu item or sub-menu).
- Page 10 Operation And Maintenance Manual Choose the concentration of Gas. Up/Down scrolls up/down in the Relay 1 Settings branch. 4.3. De-Actuation Setpoint DEACT 00XX ppm (or %) Choose the concentration of the gas at which you want the alarm condition to stop. Note: If the De-Actuation Setpoint is set at a higher concentration than the Actuation setpoint, then the setpoint function reverses and actuates on decreasing concentrations.
- Page 11 Operation And Maintenance Manual Disable (or Enable) The internal buzzer can be activated together with Relay 1 if ‘Enable’ is selected. The buzzer is silenced by pressing any of the key buttons during normal operation. Selecting ‘Disable’ only disables the buzzer activation for Relay 1.
- Page 12 Operation And Maintenance Manual Note: Changing the range in this fashion does not enhance the gas measurement accuracy. Range Adjustments CONC20MA 0XXX ppm (or %) This feature allows adjustment of the 20 milliamp point to different gas concentrations. The display will always read as low as the maximum for that gas but the concentration corresponding to 20 milliamps changes.
- Page 13 Operation And Maintenance Manual Calibration Procedure: Apply an appropriate span gas, and adjust the Gain potentiometer to get the correct reading on the display. Press Up/Down to go to the next/previous menu item. Communications Protocol PROTOCOL Optomux B4000 Press Enter and Up/Down to select the desired protocol. Digital Address ADDRESS 0001...
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Page 14: Hardware Configuration
Note: This item displays the current password, so it is important to keep security in mind when passing this item in the presence of bystanders. If the password is lost, the unit must be returned to Dwyer to be reset. Exit Menu Tree... -
Page 15: Battery
Operation And Maintenance Manual other distortions, it is necessary to provide a balancing resistor across both ends of the wire. The CMT supplies this resistor on board, and it is chosen using a jumper at JP1. 1 2 3 Terminator Selected 1 2 3 Terminator Open (default) -
Page 16: Procedure
Operation And Maintenance Manual Figure 6 Calibration Gas Bayonet Adapter 2.4.2 Procedure Calibration Procedure: Enter the configuration menu system and proceed to “CAL ZERO”. This disables alarm outputs, and forces the output signal to 4.00 milliamps. Response of these sensors to gas varies with the sensor, but in most cases the signal should be sufficiently stable in less than 5 minutes. -
Page 17: Faults
Operation And Maintenance Manual 3. Faults 3.1 Self-check Faults The microprocessor monitors a number of operational values for faults, and will display each occurrence for two seconds as follows: FAULT Where XXX is a fault code. The unit will automatically restart and continue normal operation if the fault occurred due to a temporary intrusion (e.g.: Radio frequency interference or water condensation formed due to fast temperature change). -
Page 18: Fault Codes
Operation And Maintenance Manual Fault Codes: Fault Code Description Action Audible LCD Fault (1 beep, 5 second silence) Return unit to factory for repair if fault persists. EEPROM FLASH EEPROM write time-out. Return unit to factory for repair if Data EEPROM write time-out. fault persists. -
Page 19: Hardware Faults
Operation And Maintenance Manual 3.2 Hardware Faults Screen Blank, no Signal Check wiring, check fuses. Distorted Milliamp Signal Output jumper set to voltage. Voltage signal pinned high Output jumper set to milliamps No milliamp Signal on AC floating power Check for signal common line. supply Check for signal operation by using on-board test points... -
Page 20: Wiring And Power Supplies
Operation And Maintenance Manual 4. Wiring and Power Supplies The CMT Power Supply input is not isolated internally from the electronics and thus the signal common. Therefore, while the power supplied may be AC or DC, care must be taken to avoid the creation of multiple grounds (or a ground loop). Figure 7 24VAC Floating Supply 4-Wire Installation Figure 8 24VAC with Common Grounds - 3-Wire Installation 83850-001-003 RF... - Page 21 Operation And Maintenance Manual Figure 9 24VDC Supply with Common Ground - 3-Wire Installation Figure 10 RS-485 Connection Figure 11 Relay 83850-001-003 RF Jan 2009...
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