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GASMAX CX + GDS-IR Operation & Maintenance Manual, Revision 1.0 

 

Page 8 

CONNECTING

 

DC

 

POWER

 

&

 

OUTPUT

 

SIGNAL

 

WIRING

 

To

 

access

 

the

 

GASMAX

 

signal

 

and

 

power

 

connections,

 

remove

 

the

 

cover

 

on

 

the

 

GASMAX

 

CX

 

explosion

‐

proof

 

enclosure,

 

loosen

 

the

 

2

 

thumbscrews

 

holding

 

the

 

display

 

assembly

 

and

 

remove

 

it.

 

The

 

display

 

will

 

remain

 

connected

 

to

 

the

 

IO/Power

 

Supply

 

PCB

 

mounted

 

in

 

the

 

back

 

of

 

the

 

enclosure

 

by

 

a

 

short

 

ribbon

 

cable.

  

 

 

 

 

 

Figure 3-1: GASMAX CX I/O Power & Signal Wiring 

 

Route

 

the

 

power

 

and

 

signal

 

wires

 

through

 

the

 

conduit

 

entry

 

and

 

connect

 

to

 

terminal

 

block

 

“TB1”.

  

Plus

 

24VDC

 

connects

 

to

 

TB1

‐

1.

  

DC

 

Ground

 

connects

 

to

 

TB1

‐

4.

 

Channel

 

One

 

4

‐

20mA

 

output

 

is

 

available

 

on

 

TB1

‐

2

 

and

 

Channel

 

Two

 

4

‐

20mA

 

output

 

is

 

available

 

on

 

TB1

‐

3.

   

 

GDS

 

Corp

 

always

 

recommends

 

using

 

shielded

 

wire

 

for

 

signal

 

and

 

power

 

cable.

   

 

 

CONNECTING

 

TO

 

AN

 

ETHERNET

 

NETWORK

 

The

 

GASMAX

 

CX

 

provides

 

a

 

standard

 

10/100

 

Ethernet

 

network

 

interface

 

on

 

the

 

Power

 

I/O

 

board

 

as

 

shownin

 

Fig.

 

4

‐

2.

 

Both

 

DHCP

 

and

 

fixed

 

IP

 

address

 

modes

 

are

 

provided.

 

The

 

Ethernet

 

interface

 

provides

 

access

 

to

 

the

 

MODBUS

 

database

 

via

 

MODBUS/TCP

 

as

 

well

 

as

 

remote

 

access

 

and

 

setup

 

via

 

a

 

built

‐

in

 

web

 

server.

  

 
 
 
 

 

COM

 

420

 

OU

T

 

2

 

420

 

OU

T

 

1

 

PWR

 

R/

P

W

R

 

C/

4

20

 

IN

 

1

 

A/

C

O

M

 

42

0

 

IN

 

2

 

CH

 

1

 

CH

 

2

 

E

‐

NET

 

LOCAL

 

SENSOR

 

TO DISPLAY  

TB1

 

–

 

1:

 

+12

‐

30VDC

 

Input

 

TB1

 

–

 

2:

 

Channel

 

1

 

4

‐

20mA

 

Out

 

TB1

 

–

 

3:

 

Channel

 

2

 

4

‐

20mA

 

Out

 

TB1

 

–

 

4:

 

Power

 

/

 

Signal

 

Common

 

NOTE:

 

THE

 

MAXIMUM

 

DISTANCE

 

4

‐

20

 

MA

 

SIGNALS

 

CAN

 

TRAVEL

 

IS

 

DEPENDENT

 

UPON

 

CABLE

 

GAUGE,

 

DC

 

POWER

 

SUPPLY

 

VOLTAGE

 

LEVEL

 

AND

 

INPUT

 

IMPEDANCE

 

OF

 

THE

 

RECEIVING

 

DEVICE.

  

ASSUMING

 

A

 

NOMINAL

 

24

 

VDC

 

POWER

 

SUPPLY,

 

100

 

OHM

 

LOAD

 

AND

 

MAXIMUM

 

TOTAL

 

LOOP

 

RESISTANCE

 

OF

 

750

 

OHMS:

 

#18GA,

 

0.0064

 

OHM/FT

 

=>

 

9.6

 

MILES

 

/

 

15.5

 

KM

 

#24GA,

 

0.026

 

OHMS/FT

 

=>

 

2.3

 

MILES

 

/

 

3.7

 

KM

 

Note:

 

Local

 

GDS

‐

IR

 

output

 

is

 

on

 

Channel

 

2

 

Remote

 

GDS

‐

IR

 

output

 

can

 

be

 

configured

 

for

 

either

 

channel.

 

Содержание GASMAX CX

Страница 1: ... Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax ww gdscorp com Operation and Maintenance Manual GASMAX CX GDS IR GASMAX CX Gas Monitor with GDS IR Infrared Sensor for Combustibles and Carbon Dioxide ...

Страница 2: ...TION MANUAL COMPLETELY BEFORE OPERATING OR SERVICING ATTENTION POUR DES RAISONS DE SÉCURITÉ CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ ÉTUDIER LE MANUE D INSTRUCTIONS EN ENTIER AVANT D UTILISER D ENTRETENIR OU DE RÉPARER L ÉQUIPEMENT REVISION HISTORY Revision 1 0 2 15 17 Initial Release Copyright 2017 GDS Corp All Rights Reserved P N 1200 0934 01 ...

Страница 3: ...ITIAL STARTUP ___________________________________________________ 12 5 CALIBRATION ______________________________________________________ 16 6 MAINTENANCE_____________________________________________________ 19 7 TROUBLESHOOTING_________________________________________________ 21 8 SPECIFICATIONS ____________________________________________________ 23 9 SPARE PARTS ________________________________...

Страница 4: ... 3 6 MODBUS WIRING JUNCTION BOX 11 FIGURE 3 7 MODBUS JBOX LOCATION OPTIONS 11 FIGURE 4 1 GASMAX SINGLE CHANNEL DISPLAY 12 FIGURE 4 2 GASMAX DUAL CHANNEL DISPLAY 12 FIGURE 4 3 USER MENU SCREEN 13 FIGURE 4 4 ACCESSING CAL MODE 13 FIGURE 4 5 GASMAX DATA DISPLAY 14 FIGURE 4 6 GASMAX TREND DISPLAY 14 FIGURE 5 1 CALIBRATION FLOWCHART 16 FIGURE 5 2 CALIBRATION SETUP 17 FIGURE 5 3 IR ZERO FOR LOCAL SENSOR...

Страница 5: ...ain gases in ambient air Accuracy in atmospheres containing steam or inert gases cannot be guaranteed The GDS IR infrared sensor may be mounted vertically or horizontally Do not mount the GDS IR upside down If using the GDS Rain Shield IRRS the sensor must be mounted horizontally Do not paint transmitter or sensor assembly Do not operate the GASMAX CX GDS IR if the enclosure is damaged or cracked ...

Страница 6: ...X GDS IR Local Sensor Figure 2 2 GASMAX CX GDS IR Remote Sensor The GASMAX CX is enclosed in a CSA FM IECEx certified anodized aluminum explosion proof yellow enclosure designed to protect the electronics and make it easy for workers to identify in industrial environments The screw on front cover is easily removed for installation and maintenance however built in user interface magnetic switches a...

Страница 7: ...ss 1 Division 1 hazardous areas Installation in these areas should follow best industry standard practices and all appropriate electrical codes Generally these codes require rigid metal conduit poured seals and other installation elements necessary to ensure safety For maximum protection against RF interference or electrical surge the GASMAX CX enclosure all remote sensors and interconnecting cond...

Страница 8: ...er cable CONNECTING TO AN ETHERNET NETWORK The GASMAX CX provides a standard 10 100 Ethernet network interface on the Power I O board as shownin Fig 4 2 Both DHCP and fixed IP address modes are provided The Ethernet interface provides access to the MODBUS database via MODBUS TCP as well as remote access and setup via a built in web server COM 420 OUT 2 420 OUT 1 PWR R PWR C 420 IN 1 A COM 420 IN 2...

Страница 9: ...CX Optional Relay MODBUS Interface NOTE THE FAULT RELAY IS PROGRAMMED TO OPERATE IN FAILSAFE MODE ONLY THE RELAY IS ACTIVE WHEN NO FAULT EXISTS C NO AND BECOMES INACTIVE IF A FAULT IS PRESENT C NC COM 420 OUT 2 420 OUT 1 PWR R PWR C 420 IN 1 A COM 420 IN 2 CH 1 CH 2 E NET LOCAL SENSOR TO DISPLAY 2 3 4 1 TB1 5 B S A A B TB2 Relay Wiring 1 Fault 1 NC 2 Fault 1 Common 3 Fault 1 NO 4 Relay 3 NC 5 Rela...

Страница 10: ...he GASMAX CX and a remote GDS IR sensor is provided by the customer The interface requires a four conductor shielded cable as shown below The remote junction box provides both a magnetic switch and local pushbutton for the IR Zero function Figure 3 5 GASMAX CX GDS IR Remote Sensor Wiring Diagram COM 420 OUT 2 420 OUT 1 PWR R PWR C 420 IN 1 A COM 420 IN 2 CH 1 CH 2 E NET LOCAL SENSOR TO DISPLAY Bla...

Страница 11: ...that the supply voltage for the GASMAX CX at the far end of the string not fall below 12VDC during power up Note that while the GASMAX CX has two sets of wiring terminals for MODBUS A and B signals daisy chain power wiring requires that two wires be installed in the 24 and GND terminals on the GASMAX CX I O Power Supply board This can be difficult if wire sizes are larger than 18GA For these reaso...

Страница 12: ... INTERFACE The GASMAX CX display is shown in Figure 5 1 There are four magnetic switches on the face of the GASMAX CX arranged in a quadrant around the LCD display these are labeled NEXT EDIT DOWN CAL and UP To activate or press a magnetic switch swipe the magnetic wand near the switch For the balance of this manual the term press will be used to describe activation of any key via the magnetic wan...

Страница 13: ...AY COMPROMISE THE SAFETY OF THE GAS DETECTION SYSTEM BE SURE TO UNDERSTAND WHAT TO CHANGE AND WHY BEFORE ENTERING THE USER MENU Press the DN CAL key followed by the EDIT key to access CALIBRATION MODE Regular calibration is critically important to the continued safe operation of any gas detection system See Chapter 6 for more information on calibration Figure 4 4 Accessing Cal Mode NOTE TAKE CARE ...

Страница 14: ...ation if LED is ON the relay will be de energized In dual channel mode if either channel is in alarm the corresponding A1 or A2 indicator LED and relay will be energized Figure 4 5 GASMAX Data Display Two LEDs monitor the MODBUS RS 485 transmit TXD and receive RXD buffers Flashing indicates sent or received data RXD will flash whenever a message from the MODBUS master is received and TXD will flas...

Страница 15: ...IONAL ALARM RELAYS ARE NOT INSTALLED ALARM SETTINGS AFFECT THE OPERATION OF THE FRONT PANEL DISPLAY ONLY SEPARATE ALARM SETTINGS MAY NEED TO BE PROGRAMMED IN THE 4 20MA RECEIVING DEVICE ALARM OPERATION FAULT FAULT is typically used to indicate FAULT conditions that suggest sensor failure or out of measurement range conditions SYSTEM SETUP Once operational the user should verify the following setti...

Страница 16: ...tion gas that has passed its expiration date Check the SPAN GAS VALUE setting and make sure it matches the calibration gas value Always use a GDS Corp calibration cup or wrap that completely surrounds the sensor head Be sure to use ZERO AIR a mixture of 21 oxygen and 79 nitrogen as a zero reference unless you are certain that no target gas exists in the area Ambient gas may result in an elevated z...

Страница 17: ... 2 Calibration Setup STEP ONE GDS IR ZERO 1 Connect the cylinder of zero air to the fixed flow regulator and connect the tubing to the calibration port on the bottom of the GDS IR sensor 2 Install the GDS IR calibration wrap accessory around the GDS IR to block the sensor s gas access holes 3 Turn on the regulator and allow gas to run for 30 seconds 4 Local sensor Use the magnetic wand to trigger ...

Страница 18: ... Double check the concentration and expiration date The reading will increase as the span gas flows into the sensor 5 After the reading is stable approximately 1 minute press the EDIT key to complete the SPAN GAS calibration If the SPAN calibration is successful the display flashes REMOVE CAL GAS and starts the CAL PURGE delay 6 Immediately shut off the regulator and remove the calibration wrap At...

Страница 19: ...ds to the type of fault detected The GDS IR should be checked regularly for damage water ingress or hydrophobic filter clogging due to excessive dust or dirt If the hydrophobic filter has become contaminated by dust dirt or moisture unscrew the sensor head cover remove the set screw and gently slide the filter down to remove See Fig 7 1 Carefully clean the filter with compressed air and reinstall ...

Страница 20: ...n This will eventually allow the waveguide assembly to be removed from the GDS IR 5 Using a cotton swab and alcohol clean the surfaces of the Receiver and Source as shown 6 Reassemble the GDS IR 7 Perform a hardware zero once the sensor is completely reassembled NOTE IT IS NOT NECESSARY TO REMOVE POWER FROM THE GDS IR TO PERFORM THIS CLEANING PROCESS Figure 6 1 GDS IR Disassembly ...

Страница 21: ...MAX count settings are correct MIN counts should be 800 which corresponds to 4mA and MAX counts should be 4000 which corresponds to 20 mA Verify that the GASMAX MODBUS address matches the address programmed into the controller s channel configuration CONTROLLER SHOWING MODBUS COMM ERROR Check for incorrect MODBUS polarity swap A and B if unsure no damage will occur Verify that MODBUS master is req...

Страница 22: ... Note that a COLD BOOT will reset certain values to their default setting including the MODBUS address value If a Smart Sensor is connected to a local sensor head the GASMAX will reload the sensor type range cal span value and other sensor related values automatically ...

Страница 23: ...ndard Output Three wire 4 20mA current source outputs with fault and overrange indication Maximum loop resistance is 750 ohms with standard 24VDC supply Optional Output Relay MODBUS interface with 4x 5A SPDT programmable alarm relays Temperature Electronics 40 C to 60 C Memory On board non volatile memory retains all user settings Housing Aluminum housing with epoxy paint standard 316 stainless st...

Страница 24: ...are Parts Yellow Enclosure 10 0160 GASMAX Enclosure Electronics Nest Assembly 10 0387 Display Board 10 0388 Relay MODBUS Board 10 0390 Power I O Board 20 0195 GDS IR Sensor Personality Board GDS IR Sensor GDS IR Part number determined by target gas type Contact Factory for details 20 0236 Rain Shield 20 0243 Calibration Wrap ...

Страница 25: ...GASMAX CX GDS IR Operation Maintenance Manual Revision 1 0 Page 25 10 DRAWINGS AND DIMENSIONS Figure 10 1 GASMAX CX GDS IR DIMENSIONS Vertical 5 0 5 25 12 25 ...

Страница 26: ...GASMAX CX GDS IR Operation Maintenance Manual Revision 1 0 Page 26 Figure 10 2 GASMAX CX GDS IR DIMENSIONS Horizontal 5 0 12 25 ...

Страница 27: ......

Страница 28: ...GDS Corp 1245 Butler Road League City TX 77573 409 927 2980 409 927 4180 Fax ww gdscorp com ...

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