Dwyer Instruments CMT Series Manual de usuario

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- 141 FAX: 21 -872- 057

Web: www.dwyer-inst.com

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

CMT Configuration:

Default Settings

Factory User

Settings Settings

1. Signal 4 mA See Table Below ________________

20 mA See Table Below ________________

2. Password 0017 ________________

3.* Relay 1 Actuation Ena led ________________

4. Relay 1 Setpoint (Actuation) See Table Below ________________

5. Relay 1 Release Point See Table Below ________________

(De-Actuation)

6. Relay 1 Actuation Delay 0 Minutes ________________

7. Relay 1 De-Actuation Delay 0 Minutes ________________

8.* Relay 2 Actuation Ena led ________________

9. Relay 2 Setpoint (Actuation) See Table Below ________________

10. Relay 2 Release Point See Table Below ________________

(De-Actuation)

11. Relay 2 Actuation Delay 0 Minutes ________________

12. Relay 2 De-Actuation Delay 0 Minutes ________________

13 Communication Protocol Optomux ________________

14. Digital Address 0001 ________________

15 Baud Rate 4800 ________________

Note: Relay setpoints are included in the software; however relays are optional.

Rela 1 (Warning)

(If Applicable)

Rela 2 (Alarm)

(If Applicable)

Gas T pe

4 mA

Default

20 mA

Default Setpoint Release Point Setpoint Release Point

0 ppm 6.0 ppm 1.0 ppm 0.8 ppm 3.0 ppm 2.5 ppm

CO 0 ppm 125 ppm 25 ppm 20 ppm 50 ppm 40 ppm

NO 0 ppm 100 ppm 25 ppm 20 ppm 50 ppm 40 ppm

0 ppm 50 ppm 25 ppm 20 ppm 35 ppm 30 ppm

0% 25% 1 .50%

Decreasing 20.00% 23.00%

Increasing 22.00%

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

Table Of Contents

Default Settings...........................................................................................................................................1

PRINCIPLES OF OPERATION........................................................................................................3

1.1

DISPLAY.............................................................................................................................................3

1.2

KEYPAD AND FUNCTION CONFIGURATION .........................................................................................3

1.3

PASSWORD .........................................................................................................................................4

1.4

OUTPUT SIGNALS ...............................................................................................................................4

1.5

METER JACKS ....................................................................................................................................4

1.6

SIGNAL AND DISPLAY RANGE ............................................................................................................4

1.7

OPTIONAL RELAY PACKAGE...............................................................................................................5

1.8

DEFAULT CONDITIONS .......................................................................................................................5

SENSING AND CALIBRATION...............................................................................................................5

1.9.1

Calibration ...................................................................................................................................5

1.9.2

Implications for Troubleshooting.................................................................................................5

FUNCTION AND CONFIGURATION .............................................................................................6

2.1

MENU STRUCTURE AND USE..............................................................................................................6

2.2

CONFIGURATION AND CALIBRATION ..................................................................................................7

2.3

HARDWARE CONFIGURATION...........................................................................................................13

2.3.1

Output Signals ............................................................................................................................13

2.3.2

RS 485 End of Line Wiring and Termination ............................................................................13

2.3.3

Battery ........................................................................................................................................14

2.4

GAS CALIBRATION ...........................................................................................................................14

2.4.1

Equipment Required ...................................................................................................................14

2.4.2

Procedure ...................................................................................................................................15

2.4.3

Calibration Errors......................................................................................................................15

FAULTS..............................................................................................................................................16

3.1

SELF-CHECK FAULTS........................................................................................................................16

3.2

HARDWARE FAULTS.........................................................................................................................18

WIRING AND POWER SUPPLIES ................................................................................................19

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

CMT Operating Manual

1. Principles of Operation

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.

The keypad is a set of 3 buttons recessed along the upper right side of the enclosure. It is

not necessary to open the cover for use of the keypad. Access to the menus is password

restricted. Press any key for 3 seconds to enter the menus. (See below for details)

Figure 1 CMT Internal View - Features

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

1.3 Password

Factor 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 Dw er 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. On over range concentrations the signal can exceed the range slightly.

MPORTANT

: Voltage monitoring should be into a monitor with at least 50 000 ohms

input impedance. Voltage monitoring is not recommended over long distances, as

these signals are more susceptible to induced noise than current signals

1.5 eter Jacks

Test pads accepting standard test probes are provided on the circuit card. These are

labeled SigA, SigB and Common

To test milliamp signals measure:

• SigA to Common shorts to internal ground.

• SigA to SigB without interrupting signal to monitor

To Test voltage signals measure:

• SigB to Common.

1.6 Signal and Display Range

It is important to distinguish between Signal Range (often called Span) and Display

Range.

Figure 2 Signal Configuration JP3

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

 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. The default setting for 20 mA varies with the gas type.

The Signal range is fully adjustable within the limits imposed by the Display Range. Both

the 4 mA level and the 20 mA level can be reassigned through the menu system. Please

note that this adjustment does not change the measurement resolution.

1.7 Optional Relay Package

Two relays are supplied; single pole double throw (SPDT; Form C) 1 Amp. Dry contacts

only. Configuration allows setpoint adjustment for actuation point, dead-band, and

delays, increasing or decreasing concentrations. The relay settings have the same range as

the Display Range, and are independent of Signal Range.

1.8 Default Conditions

Default conditions are those conditions, which occur:

• During the short wait state on Power On.

• In Fault status.

• In the menu tree.

In these situations the following conditions hold:

• Signal set at 4.0 milliamps (2 Volts)

• Relays set non-energized.

• Digital communications report 0; no alarm status and 4 milliamp equivalent

signal.

1.9 Sensing and Calibration

Sensor type: Various electrochemical.

1.9.1 Calibration

The sensor is strongly linear in it’s response to gas. It is therefore straightforward to

calibrate. Two gases are needed for calibration: Zero gas (clean air) and an appropriate

span gas. Adjustment is by one potentiometer on the circuit board.

1.9.2 Implications for Troubleshooting

The microprocessor will detect various component faults and out-of-range conditions,

and drop the output signal to 0.0 milliamps. When a fault is detected, both relays will be

deactivated as well. However, it cannot detect simple out of calibration conditions, which

can only be detected by applying a gas standard.

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

2. Function and Configuration

2.1 enu 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. See Figure 1 Page 3.

Displa : The display is 2 line by 8 character alphanumeric. The top line contains the

feature name and the second contains the variable.

Ke pad: The keypad consists of three (3) pushbutton switches.

S1 Scroll Up

S2 Scroll Down

S3 Enter/Accept

Displa at Turn-On:

The display shows the following for about 2 seconds:

QEL M-5

Vx.xx Ry

Where: x.xx = the Software Version

y = the Software Revision

Followed for about 2 seconds by:

ElectrCh

Vx.xx Ry

Where: ElectrCh = Electrochemical

x.xx = the Sensor Algorithm Version

y = the Sensor Algorithm Revision

Displa in Operation: The display shows

GAS

xxx Units

Where GAS will show the target gas, and xxx is concentration of

the gas. Units may be either ppm (parts per million) or %.

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

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.

Data Entr Mode: Enter the data entry mode by pressing S3 (Enter) while displaying

any feature. This mode is indicated by an * (asterisk) at the right of the variable, and

indicates that the variable may be changed by scrolling. Press S3 (Accept) to save result

and return to menu tree. While in data entry mode, the Up and Down keys perform an

automatic key repeat while the key is held in.

Password: The first item on entering the menu tree is a Password request. The display is

0000, the default password is 0017. The * appears, indicating that a number can be

entered and accepted. This number can be changed by the user (see below).

Fault: In case of faults, the display will read FAULT and a fault code in the bottom LCD

line (see below). Signal will drop to 0 milliamps.

See section 3 below for more information on faults.

2.2 Configuration and Calibration

Note: The user has control of all variables, including calibration gas concentrations,

alarm settings and signal range (both 4 milliamp and 20 milliamp) assignments. It is

important to note that these must be chosen carefully with regard to calibration. Zero

calibration is done through a menu option, Span calibration is done though a

potentiometer on the circuit card, not through the menu system, and so it is possible to

perform the adjustment without the menu system; however, the menus do offer disabling

of output actuation.

1. Press any key for 3 seconds to enter menu system

Gas T pe Displa

Range

Warning

(Rela 1)

W-Deact Alarm

(Rela 2)

A-Deact 20 mA

Default

0-10.0 ppm 1.0 ppm 0.8 ppm 3.0 ppm 2.5 ppm 6.0 ppm

CO 0-250 ppm 25 ppm 20 ppm 50 ppm 40 ppm 125 ppm

NO 0-200 ppm 25 ppm 20 ppm 50 ppm 40 ppm 100 ppm

0-100 ppm 25 ppm 20 ppm 35 ppm 30 ppm 50 ppm

1 .50% 23.00%

Decreasing Increasing

25%O

0-25 % 20.00% 22.00%

Table

Default Settings

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

2. Password Control

PASSWORD

0000 *

Press up/down to choose correct password and accept.

3. Factory Settings Sub-menu Branch

FACTORY

Settings

This function is for factory setup and test only.

4. Rela 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).

4.1 RELAY

Enable

Press Enter to change. “*” Indicates to use scroll buttons to toggle between

Enable, Disable or Latching. Press Accept when done.

Note that this disables the physical relay, but not the setpoint. Setpoint

actuation status will still be transmitted on the digital communications link

if queried.

When the “Latching” option is selected, the relay will not de-actuate

unless it is cancelled by pressing one of the keyboard buttons. The relay

will only reset if the alarm situation has dissipated.

Enable is the default.

Press Down button to continue through Relay 1 Settings branch. Press Up

to return to Main Menu (and Relay 1 Settings sub-menu branch).

4.2 Actuation Setpoint

ACTUATE

00XX ppm (or %)

Operation And Maintenance Manual

83850-001-003 RF Jan 2009

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.

Note: The software will not allow the user to set Actuation = De-actuation.

If Actuation is set equal to De-actuation, the Actuation Setpoint will be

adjusted upward by 10% of display range automatically before saving the

new settings.

4.4 Actuation Delay.

ACT-TIME

00 min

Adjust the amount of time delayed before the relay is actuated after the

Actuation Setpoint is reached. A maximum of 60 minutes is possible,

adjustable in 5-minute increments.

Default is 0000.

4.5 De-Actuation Delay.

DEACTIME

00 min

Adjust the amount of time delayed before the relay is released after the De-

Actuation setpoint is reached. A maximum of 60 minutes is possible,

adjustable in 5-minute increments. Default is 00.

4.6 Buzzer.

BUZZER

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