ENMET CO-GUARD Manuale utente

ENMET

ENMETENMET

ENMET Corporation

PO Box 979

Ann Arbor, MI 48106-0979

80002-044

April 2006

MCN-347, 05/18/06

CO-GUARD

Compressed Air Line CO Monitor

Manual

Table of Contents

1.0 INTRODUCTION........................................................................................................................................................1

1.1 U

NPACK

......................................................................................................................................................................1

1.2 C

HECK

RDER

.............................................................................................................................................................1

1.3 S

ERIAL

UMBERS

........................................................................................................................................................1

2.0 COMPONENTS OF THE CO-GUARD.......................................................................................................................2

2.1 CO-G

UARD ELEMENTS

................................................................................................................................................2

2.2 CO-G

UARD

PERATIONAL

EATURES

..........................................................................................................................2

2.3 C

IRCUIT

OARD

EATURES

..........................................................................................................................................4

3.0 INSTALLATION .........................................................................................................................................................5

3.1 M

OUNTING

CO-G

UARD

...............................................................................................................................................5

3.2 W

IRING THE

CO-G

UARD

..............................................................................................................................................6

3.2.1 Air Supply............................................................................................................................................................6

3.2.2 Power Supply.......................................................................................................................................................6

3.2.3 Relay Contacts.....................................................................................................................................................7

4.0 OPERATION................................................................................................................................................................8

4.1 S

TART

CO-G

UARD

.................................................................................................................................................8

4.1.1 Typical Start Up...................................................................................................................................................8

4.2 N

ORMAL

ISPLAY

ODE

.............................................................................................................................................9

4.2.1 Alarm Conditions CO-G

UARD

..............................................................................................................................9

5.0 MAINTENANCE .......................................................................................................................................................10

5.1 M

AINTENANCE

ENUS

..............................................................................................................................................10

5.2 C

ALIBRATION OF THE

CO-G

UARD

..............................................................................................................................12

5.2.1 Exit Maintenance Menu......................................................................................................................................13

5.2.2 Zero Adjust ........................................................................................................................................................13

5.2.3 Gas Span ...........................................................................................................................................................14

5.2.4 Alarm Set Points ................................................................................................................................................15

5.2.5 Span Set.............................................................................................................................................................15

5.4 S

ENSOR

EPLACEMENT

.............................................................................................................................................16

6.0 REPLACEMENT PARTS..........................................................................................................................................17

7.0 TECHNICAL DATA AND SPECIFICATIONS........................................................................................................17

8.0 WARRANTY..............................................................................................................................................................18

List of Tables

ABLE

1 : R

ELAY

AILSAFE

ETTINGS

.................................................................................................................... 7

ABLE

2: F

ACTORY

LARM

OINTS

.................................................................................................................. 9

ABLE

3: CO-G

UARD

AINTENANCE

ENUS

EQUENCE

.........................................................................................10

ABLE

4: C

ALIBRATION

.................................................................................................................................13

List of Illustrations

IGURE

1: E

XTERNAL

CO-G

UARD

EATURES

.......................................................................................................... 3

IGURE

: O

PTIONAL

EGULATOR AND

AMPLE

OSE

..................................................................................... 3

IGURE

2: CO-G

UARD

IRCUIT

OARD

EATURES

................................................................................................... 4

IGURE

3: M

OUNTING

CO-G

UARD

.......................................................................................................................... 5

IGURE

4: P

OWER

ERMINAL

ONNECTIONS

CO-G

UARD

.......................................................................................... 6

IGURE

5: R

ELAY

ERMINAL

ONNECTIONS

CO-G

UARD

........................................................................................... 7

IGURE

6: CO-G

UARD

AINTENANCE

ENU

LOW

HART

......................................................................................11

IGURE

7: C

ALIBRATION

DAPTER

.........................................................................................................................12

IGURE

8: CO-G

UARD

ENSOR

EPLACEMENT

.......................................................................................................16

Reference Information:

OTE

:[important information about use of instrument]

AUTION

:[affects equipment – if not followed may cause damage to instrument, sensor etc…]

ARNING

[affects personnel safety – if not followed may cause bodily injury or death.]

Earth Ground

CO-G

UARD

ENMET Corporation

1.0 Introduction

1.0 Introduction1.0 Introduction

1.0 Introduction

The CO-G

UARD

is a compressed air monitoring instrument that measures and detects Carbon Monoxide (CO) in

industrial compressed breathing air systems utilizing an electrochemical sensor. The CO-G

UARD

is N

in an

enclosure rated for use in a Class I, Div 1, Groups B, C, D classified area and C

be installed in a hazardous

location.

Features of the CO-G

UARD

continuous monitoring of the sample air

continuous LCD display of gas and vapor concentrations

menu driven operational and maintenance controls

menu driven calibration procedure

audio and visual alarms indicate unsafe conditions

alarm relay contacts available on terminals

a fault relay and visual fault alarm

low air flow fault indication and display

alarm acknowledgement capability including audio defeat

mA outputs for target gas

OTE

:All specifications stated in this manual may change without notice.

1.1 Unpack

Unpack the CO-G

UARD

and examine it for shipping damage. If such damage is observed, notify both ENMET

customer service personnel and the commercial carrier involved immediately.

Regarding Damaged Shipments

OTE

:It is your responsibility to follow these instructions. If they are not followed, the carrier will

not honor any claims for damage.



This shipment was carefully inspected, verified and properly packaged at our company and delivered to the

carrier in good condition.



When it was picked up by the carrier at ENMET, it legally became your company’s property.



If your shipment arrives damaged:

•Keep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local office

and request immediate inspection of the carton and the contents.

•After the inspection and after you have received written acknowledgment of the damage from the carrier,

contact ENMET Customer Service for return authorization and further instructions. Have your Purchase Order

and Sales Order numbers available.



ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability

coverage, usually $100.00. Repair or replacement charges above that value are your company’s responsibility.



The shipping company may offer optional insurance coverage. ENMET only insures shipments with the

shipping company when asked to do so in writing by our customer. If you need your shipments insured, please

forward a written request to ENMET Customer Service.

Regarding Shortages

If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days

of receipt at the following address:

ENMET Corporation

680 Fairfield Court

Ann Arbor, MI 48108

734-761-1270 734-761-3220 Fax

1.2 Check Order

Check, the contents of the shipment against the purchase order. Verify that the CO-G

UARD

is received as ordered.

Each CO-G

UARD

is labeled with its target gas. If there are accessories on the order, ascertain that they are present.

Check the contents of calibration kits. Notify ENMET customer service personnel of any discrepancy immediately.

1.3 Serial Numbers

Each CO-G

UARD

is serialized. These numbers are on tags on the equipment and are on record in an ENMET database.

ENMET Corporation CO-G

UARD

2.0 Components of the

2.0 Components of the 2.0 Components of the

2.0 Components of the CO-G

UARD

2.1 CO-G

UARD

elements

See Figure 1 for location of elements:

Feature Description

Enclosure A polycarbonate box, approximately 7 x 5 x 3, with a detachable front cover.

4 holes for mounting the enclosure to a vertical surface. Located at the corners of the bottom

of the enclosure, directly beneath the 4 front cover retaining screws. See Figure 3

Input Port The entrance for the air sample and calibration gas. The quick release fitting mates with one

on the optional Sample air hose and the calibration adapter.

Front Cover Detachable front cover of CO-G

UARD

with Display Panel. See Section 2.2 and Figure 1

There are 4 Screws that hold the front cover in place.

Sample Air Hose

(Optional) A five foot long hose to conduct a sample of the air from the source to the instrument.

The hose has a Female quick release fitting and regulator. See Figure 1a

Regulator

(Optional) To connect to the compressed air line. Sample pressure to the CO-G

UARD

should be set to

PSI

. See Figure 1a

2.2 CO-G

UARD

Operational Features

The Display Panel is attached by a cable and is released by unscrewing the 4 screws located in the corners. After

releasing the panel, it is swung upward, exposing the interior of the enclosure. See Figure 1 for location of features.

Feature Description

Display A single line, 8 character LCD with backlight. Indicates the level of gas detected by sensor.

The numerical value of gas concentration and other information is displayed.

Audio Alarm(Horn) Audio alarm (2900 Hz,95 dB at 2 ft.). The audio alarm is on when the unit is in alarm.

Visual Indicators and

Alarms LED indicators:

Power / Fault Indicator LED, Green / Red

Alarm (3) Indicator LED, Red

Membrane Switches 2 Pushbutton Switches on front panel control the instrument maintenance functions. The

pushbutton switch locations are indicated by:

ENU

↓

↓↓

↓: Advances the instrument display through operation information and maintenance

menus

ELECT





: Disables audio alarm temporally and

Selects the maintenance menu operations such as, Zero, Span, Exit menu or sets

proper calibration values for Zero or Span

See Section 4.0 and 5.0 for operational and maintenance flow charts.

Flowmeter A flow indicator located at the output of the sample flow stream, which indicates

quantitatively the flow of sample air or calibration gas through the instrument.

Three alarm points are preprogrammed into the CO-G

UARD

. At each alarm point, an LED on the front panel is

activated. These internal alarm settings are independent of the 4-20mA output alarm values that can be set at a

controller. An optional relay board is available that will activate 0.5 Amp relay contacts at each alarm point, plus a

fault relay.

CO-G

UARD

ENMET Corporation

Figure 1: External CO-G

UARD

Features

Figure 1a: Optional

EGULATOR AND

AMPLE

OSE

Regulator

Female Quick Release

Fitting to Inlet Port

¼“ NPT

Select

Input Port

Audio Alarm

Strain Relief

Visual Indicators:

Alarm1, Alarm2, Alarm3

Flowmeter

Pushbutton Switches

Visual Indicator

Power/Fault

Front Cover

Retaining Screws

4 places

ENMET Corporation CO-G

UARD

2.3 Circuit Board Features

The Display Panel is attached by a cable and is released by unscrewing the 4 screws located in the corners. After

releasing the panel, it is swung upward, exposing the interior of the enclosure. The Circuit Board is mounted at the

back surface of the enclosure interior. Features are shown in Figure 2.

Feature Description

Relay Terminals This group of terminals is located on the Circuit Board.

For the contacts for each of three alarm relays, and for the contacts of a fault relay.

See Section 3.2.2

Output Terminals For the 4-20 mA output.

PCB/Sensor Manifold The PCB/Sensor manifold. The carbon monoxide sensor located under this housing.

Figure 2: CO-G

UARD

Circuit Board Features

Relay Terminals

J14, J15, J16, J17

PCB/Sensor Manifold

Relays

K1, K2, K3, K4

Terminal J12

External Power

4-20mA Output

CO-G

UARD

ENMET Corporation

3.0 Installation

3.0 Installation3.0 Installation

3.0 Installation

The CO-G

UARD

should be located near the pipe or tank containing the air to be monitored, and upstream from where

the air is being used. The CO-G

UARD

must be installed such that it samples the compressed air before it reaches the

users.

3.1 Mounting CO-G

UARD

Mount the CO-G

UARD

instrument on an appropriate vertical surface, leaving room for lid to be opened, using the

mounting holes provided. Avoid areas with excessive vibration or temperature extremes. The holes in the bottom of

the enclosure are 0.18 inch in diameter and form a 6.44″x 4.47″rectangle. See Figure 3

It is recommended to use #8 drywall anchors and screws for mounting the CO-G

UARD

to a drywall/sheetrock surface.

Dimensions are in inches.

Figure 3: Mounting CO-G

UARD

Left Side View

Cover Inside View

Opened Upward

Attached to Base

Ref: Remove hole plug for auxiliary wiring

ENMET Corporation CO-G

UARD

3.2 Wiring the CO-G

UARD

The electrical installation should conform to appropriate electrical codes, such as the National Electrical Code in the

United States.

ARNING

The compliance of the installation to appropriate codes is not ENMET’s responsibility.

The CO-G

UARD

should be powered through circuit breakers provided for this purpose.

3.2.1 Air Supply

Tap the pipe or tank containing the breathing air and use appropriate fittings to connect the sample input hose. The

instrument is designed to operate from an air supply pressure 55

PSIG

. The sample input hose length should be as short

as possible.

The CO-G

UARD

should be tapped into the compressed air line upstream of all respirator connection points to ensure

the CO-G

UARD

monitors the supplied air Before it gets to the respirator connection points.

3.2.2 Power Supply

The input power can vary from 100 to 240V

, 50/60 Hz. Mains power should be connected to the Power Input

Terminal TB1 and the ground screw. See Figure 4 for location.

Upon supplying air and power to the CO-G

UARD

The green power on LED is lit.

The display backlight is lit, and instrument will step through a start-up sequence: unit serial number and software

revision may be shown on the display.

The instrument may go into alarm briefly, but the sensors stabilize quickly. If the instrument persists in alarm,

acknowledge the alarm by pressing the S

ELECT

button. If alarm persists longer than 30 minutes, call ENMET

customer service personnel.

For DC wiring 24Vdc may be wired to J12, (J12-1)position 1 + with ground connected to (J12-2)position 2.

AC Power Supply Terminal: TB1

Label on PCB Function

110V

TB1 ACN Neutral

TB1 ACL Line

AC GND

220V

TB1 ACN Neutral

Optional TB1 ACL Line

AC GND

DC Power Supply Terminal: J12

Position Function

1 + 24 V

power

2GND

34 - 20 mA out

Figure 4: Power Terminal Connections CO-G

UARD

Cover Inside View

Opened Upward

Attached to Base

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