Omega FGD10B User guide

STATUS SCIENTIFIC CONTROLS

Issue:

17

Date:

7/1/20

Firmware:

V1.0.3

Installation, Commissioning &

Routine Gas Testing Manual

Gas Detector

Type FGD10B Oxygen / Toxic

Declaration of Conformity

We declare that, on the date the equipment accompanied by this declaration is placed on the market, the equipment conforms with all
technical and regulatory requirements of the directives listed below.

Description of Equipment:

The FGD10B Series of Fixed Gas Detectors for the detection of Oxygen or Toxic gases.
ATEX Flameproof Certified for use in Group IIC hazardous locations.

Directive 2014/34/EU ATEX

The following harmonised standards were used in support of this declaration:

EN 60079-0:2018 Explosive atmospheres Part 0: Equipment – General requirements
The FGD10 was originally certified to standard EN 60079-0:2006. This standard has been compared with the above harmonised standard
and no significant changes have occurred that are applicable this equipment.

EN 60079-1:2014 Explosive atmospheres Part 1: Equipment protection by flameproof enclosures ‘d’.
The FGD10 was originally certified to standard EN 60079-1:2007 but is considered compliant with the above harmonised standard
because both the instrument housing and GSH4 sensor housing are certified to that standard.

Notified Body for Hazardous Area Certification:

CSA Group Netherlands B.V,
Utrechtseweg 310, 6812 AR,
Arnhem,
Netherlands
Notified Body number: 2813

Notified Body for ATEX Quality Assurance Notification:

SGS Fimko Oy
Särkiniementie 3
Helsinki, 00211

Notified Body Number: 0598

Hazardous Area Certificate Number:

SIRA 08ATEX1031X II 2 G Ex d IIC
T4 (Ta = -20OC + 60 OC )

T5 (Ta = -20OC + 50 OC ) * T5 & T6 ratings are not valid for
T6 (Ta = -20OC + 35 OC ) versions fitted with an externally
mounted sensor.

ATEX Quality Assurance Notification Number:

2056

Place of Manufacture:

Mansfield, Nottinghamshire, UK. Date mark applied – see product

ISO 9001:2015 Quality Management System:

Certificate No. GB93/1938

2014/30/EU – Electromagnetic Compatibility

Harmonised Standards:
EN50270:2006 Electromagnetic compatibility - Electrical apparatus for the detection and measurement of combustible gases, toxic gases

or oxygen.

Authorised Signatory to this declaration, on behalf of the manufacturer:
Name: David Stuttard Title: Managing Director
Address: Status Scientific Controls Ltd, Hermitage Lane Industrial Estate, Kings Mill Way

Mansfield, Nottinghamshire, NG18 5ER, United Kingdom

Signature Date: 14/10/19
Extract from TD18/100

STATUS SCIENTIFIC CONTROLS

Installation, Commissioning & Routine Gas Testing

FGD10B Oxygen/Toxic Gas Detector

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CONTENTS

1. PACKAGE CONTENTS ...................................................................... 6

2. SCOPE OF THE MANUAL .................................................................. 6

3. DESCRIPTION .................................................................................... 7

3.1. GAS TYPES ................................................................................. 8

4. INSTALLATION .................................................................................. 9

4.1. CABLE ENTRIES ......................................................................... 10

4.2. MOUNTING AND TERMINAL ACCESS ............................................. 10

4.3. FGD10B CONNECTIONS ............................................................ 11

4.4. WIRING DETAILS ........................................................................ 12

4.4.1. FGD10B current sink ............................................................................ 12

4.4.2. FGD10B current source ........................................................................ 12

5. COMMISSIONING ............................................................................. 13

5.1. APPLYING POWER ...................................................................... 13

6. INITIAL GAS TESTING ..................................................................... 14

6.1. ZERO GAS ................................................................................. 14

6.2. TEST GAS ................................................................................. 16

6.2.1. Gas connection points .......................................................................... 16

6.2.2. Sampling time ....................................................................................... 17

6.2.3. Suggested calibration gas levels. ......................................................... 17

7. CALIBRATION .................................................................................. 18

7.1. SENSOR ZERO .......................................................................... 18

7.2. SENSOR SPAN .......................................................................... 19

7.3. CALIBRATION / CONFIGURATION KEYPAD ..................................... 20

7.4. MENU MODE SELECTION ............................................................ 22

7.4.1. E : 1 – Sensor Zero ............................................................................... 23

7.4.2. E : 2 – Sensor Span .............................................................................. 23

7.4.3. E : 3 – Sensor Fsd ................................................................................ 23

7.4.4. E : 4 – Output Zero (4mA) .................................................................... 23

7.4.5. E : 5 – Output Span (20mA) ................................................................. 23

7.4.6. E : 8 – Sensor Type .............................................................................. 24

7.4.7. E : 9 – Engineer diagnostics ................................................................. 25

7.4.8. E : 17 – Sensor gain ............................................................................. 26

7.4.9. E : 19 – Positive Zero Suppression ...................................................... 27

7.4.10. E : 20 – Negative Zero Suppression ............................................... 27

7.4.11. E : 25 – Positive Zero Temperature Compensation ....................... 28

7.4.12. E : 34 – Positive Span Temperature Compensation ...................... 28

7.4.13. E : 35 – Negative Span Temperature Compensation ..................... 28

7.4.14. E : 36 – Positive Zero Temperature Compensation ....................... 28

7.4.15. E : 77 – Firmware Version............................................................... 28

8. CALIBRATION .................................................................................. 29

8.1. SENSOR CALIBRATION ............................................................... 29

8.1.1. Sensor Zero .......................................................................................... 29

8.1.2. Sensor Span ......................................................................................... 30

STATUS SCIENTIFIC CONTROLS

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FGD10B Oxygen/Toxic Gas Detector

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8.2. ANALOGUE OUTPUT CALIBRATION .............................................. 31

8.2.1. Analogue Output Zero........................................................................... 32

8.2.2. Analogue Output Span.......................................................................... 32

9. ROUTINE GAS TESTING .................................................................. 33

10. SENSOR REPLACEMENT ................................................................ 34

10.1. OXYGEN / TOXIC SENSOR ........................................................... 34

11. FUSES .............................................................................................. 39

12. SPECIFICATION ............................................................................... 39

13. DIMENSIONS .................................................................................... 40

14. CERTIFICATION ............................................................................... 41

STATUS SCIENTIFIC CONTROLS

Installation, Commissioning & Routine Gas Testing

FGD10B Oxygen/Toxic Gas Detector

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1. PACKAGE CONTENTS

The FGD10B is supplied in a box containing the following items:-

Description

Stock
No

FGD10B Gas Detector

*

Installation manual

**

Calibration certificate

Optional:-

Weather guard

SS749

Calibration / Configuration Keypad

SS748

* Refer to www.status-scientific.com for Stock No’s for various gas types.

** The manual may be supplied on a CD

2. SCOPE OF THE MANUAL

This manual relates specifically to the version of the FGD10B gas detector
fitted with one of the following sensor types:-

• An Oxygen sensor.
or

• An electrochemical Toxic sensor.

STATUS SCIENTIFIC CONTROLS

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FGD10B Oxygen/Toxic Gas Detector

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Description

The FGD10B is an explosion protected ATEX and IECEx certified fixed gas
detector for use in potentially explosive atmospheres.

The unit may be optionally fitted with a protective weather guard as shown in
the following photograph.

STATUS SCIENTIFIC CONTROLS

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IMPORTANT – When used in hostile environments (e.g. oil platforms
where the instrument is exposed to salt spray or diesel) it is
recommended that the FGD10B is always fitted with its protective
weather guard. The weather guard is attached with tamperproof screws
to ensure that it is not inadvertently removed.

The unit comprises an instrument housing having two cable gland entries,
one of which is normally fitted with a certified blank, and containing the
connection terminals and electronics.

The housing containing the gas sensor has an M27 thread and is screwed
into the bottom of the unit. The sensor housing itself is a certified component
and must not be removed in service.

The main electrical features of the unit are:-

• Power supply – 8 to 24 volts dc (non-intrinsically safe)

• Loop powered 4 to 20mA dc

• Gland entry threads available – 20mm, ½” or ¾” NPT

2.1. Gas types

Versions of the FGD10B Oxygen Toxic are available for detection of gases,
fitted with any of the following sensor types:-

• O2, H2S, CO

STATUS SCIENTIFIC CONTROLS

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3. INSTALLATION

It is important that the correct cable and gland types are used when installing
the FGD10B in a hazardous location.

The cable entry devices and blanking elements of unused apertures shall be
of a certified flameproof type, suitable for the conditions of use and correctly
installed.

With the use of conduit, a suitable certified sealing device such as a stopping
box with compound shall be provided immediately at the entrance to the
flameproof enclosure.

In order to prevent dangerous overloading of the FGD10B gas detector, it is
fitted with an internal self resetting fuse which limits the maximum allowable
power dissipation.

Guidance on the correct installation of systems is provided by EN60079-14:

2014. It is the responsibility of the installer to ensure compliance with the
relevant standards.

To ensure effective gas detection, the FGD10B must be located at a height
appropriate to the density of the target gas relative to air. For example,
Methane (relative density 0.55) is lighter than air and so it will tend to
accumulate at a high level within a confined space. Whereas Petroleum
(relative density 2.8) is heavier than air and it will tend to accumulate at
around ground level.

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Cable entries

The cable entry threads are 20mm, ½” or ¾” NPT female.
The FGD10B enclosure is manufactured from die cast aluminium. Therefore,

the use of glands, conduit fittings and blanks made from brass should be
avoided because if moisture is present, bi-metallic corrosion may occur due
to the chemical reaction between the two materials.

Glands and fittings plated with nickel, tin or zinc will provide improved
protection but in harsh environments the use of stainless steel is
recommended.

When connecting the cores inside the unit it is beneficial to use pointed-nose
pliers to carefully guide the cable cores from the cable entries at the rear of
the enclosure towards the PCB mounted terminal connections situated near
to the middle of the enclosure.

3.1. Mounting and terminal access

The FGD10B should be mounted and secured using the mounting holes on
the main unit.

Figures 2 and 3 shows details of the FGD10B terminal connections – these
can be accessed as follows:-.

1. Switch OFF the supply to the FGD10B.

2. Release the locking screw located near the lip of the enclosure
cover by rotating clockwise.

3. Remove the enclosure front cover by rotating it several times in
an anti-clockwise direction.

4. The terminals can now be accessed.

Locking Screw

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FGD10B connections

ATEX certified Ex d armoured

cable glands

- 4-20 mA

+ 4-20 mA

Armoured cable

Armoured cable

Mount

vertically as

shown

Sensor

Important

Connect
enclosure
earth-point
to a high
integrity earth

Keypad

Zero
Span

Figure 2 – Armoured Cable Gland Installation

ATEX Certified compound-filled

conduit seals (stopping boxes)

Conduit

Conduit

Mount

vertically as

shown

Important

Connect
enclosure
earth-point
to a high
integrity earth

- 4-20 mA

+ 4-20 mA

Sensor

Keypad

Zero
Span

Figure 3 – EEx d Conduit Installation

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3.2. Wiring details

The FGD10B gas detector is a 4 to 20 mA loop powered device that
operates from a supply of 8 – 24 volt dc supply and as such only requires
two wires.

3.2.1. FGD10B current sink

3.2.2. FGD10B current source

- 4-20 mA

+ 4-20 mA

Sensor

Keypad

Zero
Span

0V

+24 Vdc

I 4-20 mA

Fig 4c

- 4-20 mA

+ 4-20 mA

Sensor

Keypad

Zero
Span

0V

+24 Vdc

I(4 - 20mA)

Fig 4b

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4. COMMISSIONING

Following completion of the installation:­Ensure that the front cover has not been contaminated with dirt - paying

particular attention to the thread. Replace the cover by rotating it several
times clockwise until it reaches its limit then secure using the locking screw,
turning in an anti-clockwise direction – do not over tighten.

4.1. Applying power

Once the installation is complete and the covers are secure then power can
be applied. The power source should be between 12 and 24 volts dc.

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Initial Gas Testing

FGD10B units are factory calibrated as detailed on the calibration certificate
supplied with the instrument. However, it is always advisable after installation
to confirm that the instrument reads zero with no gas present and responds
accurately when presented with an appropriate concentration of the target
gas.

The FGD10B sensor should be allowed to stabilise for the period specified
on the associated calibration certificate before attempting to check the zero
setting and gas response.

4.2. Zero gas

With no gas present check that the associated control panel display reads
zero.

a) If the instrument reads zero then no adjustment is required and gas

response testing may now be carried out as described in Section 0

b) If the instrument does not read zero then adjustment of the zero setting

is required as described in Section 5.1.1. - Sensor Zero.

c) If the analogue signal is connected to an associated control panel,

confirm that when the FGD10B display reads zero, the control panel
display also reads zero or, adjust as necessary in accordance with the
control panel manufacturers’ instructions.

* Note – If there is the possibility of a background gas being present then
zeroing of the detector should be carried out using a test gas cylinder of air in
nitrogen.

STATUS SCIENTIFIC CONTROLS

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Figure 7 – Arrangement for Application of a Certified Test Gas

Certified Test Gas
Cylinder

Remote

Sampling

Point

6mm O.D.
Sampling Tube

Calibration

Adaptor

Metal sampling adaptor, Stock No. SS336

With
weatherguard

Flow Regulator
(1 Litre/min)

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Test gas

Figure 7 shows a typical arrangement for the application of a certified test
gas.

The purpose of the test gas response check is to confirm that that the
reading on the instrument corresponds with the test gas concentration.

a) If the associated control panel reads correctly then no adjustment is

required.

b) If the above checks are satisfactory then the installation is now

complete.

c) If the instrument does not read correctly then adjustment of the sensor

span setting is required as described in Section 5.1.2. - Sensor Span.

4.2.1. Gas connection points

Certified test gas can be applied either:­a). directly to the FGD10B via the appropriate sampling/calibration adaptor.
or
b). remotely, by connecting a test gas sampling tube to the appropriate

sampling/calibration adaptor and installing a test point at the remote end of
the tube.

Method b) avoids the need to gain direct access to the unit in order to carry
out routine gas testing. The sample tube should be taken to a convenient
point and sited such that the risk of contamination is minimised. A means
must be provided to ‘cap off’ the tube when not in use in order to prevent
blockage.

The weather guard is provided with a 6mm O.D. push in tube connector to
allow connection of a gas sampling tube. Firstly, remove the blanking plug by
depressing the coloured plastic ring whilst pulling on the plug; now push in
the gas sampling tube. The standard fitting is a push fit connector for 6mm

O.D tubing. The connector is screwed into a 1/8” BSP thread; other fittings

are available on request.
Where a weather guard is not fitted, the use of a sampling adaptor (Stock

No. SS336) is required in order to present the gas to the FGD10B sensor.

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4.2.2. Sampling time

Apply the test gas and allow a sufficient time for the sample to reach the gas
detector. The response time will vary according to the length of the sampling
tube.

4.2.3. Suggested calibration gas levels.

Oxygen sensor:

Zero N2.
Span 20.9 %v/v oxygen balance nitrogen.

Toxic sensor

Zero Gas free air.
Span 50 % of measuring range (FSD).

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Calibration

Calibration of the sensor can be carried out by using the buttons on the circuit board
as seen in Fig1 and Fig 2.

These buttons only work when the FGD10B has been powered for a minimum of 10
minutes.

4.3. Sensor Zero

Sensor

Keypad

Zero
Span

Fig 1

Ensure the sensor is in a zero-gas environment.

Note: Where a purging gas has to be applied, use a flow rate of

between 500 and 1000 cc/min. Allow sufficient time for the
sensor to respond.

Press the Zero button

zero

and hold for a minimum of 5 seconds

to zero the sensor.

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4.4. Sensor Span

Always zero the sensor prior to performing a span operation.

Sensor

Keypad

Zero
Span

Fig 2

Fig 2

Apply a known concentration of gas (applicable to sensor type) at a
flow rate of between 500 and 1000 cc/min. Allow time for the sensor
to respond.

Press the Span button

span

and hold for a minimum of 5 seconds

to span the sensor.

Turn off and disconnect the calibration gas.

Note: The calibration gas level must match with the level stored in

the instrument. If the gas level is does not match then the
keypad must be used to set the correct gas level.

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4.5. Calibration / Configuration Keypad

The FGD10B sensor can be calibrated via a purpose designed keypad. The
keypad allows the user to carry out the following:

1) calibrate the sensor.

2) calibrate the 4 to 20 mA loop.

3) View the current gas level.

4) View the sensor raw data for diagnostic purposes.

Connect the keypad into the FGD10B as shown below:

The display will give the following messages:
SSCL Company

- - - ­88:88 Segment test
SSCL Manufacturer

1.0.2 Firmware version

- - - -

0.0 Gas reading

Note: if the display is continually showing - - - - then the instrument is not

communicating with the keypad.

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The menu system featured within the keypad calibration unit allows all
calibration and configuration activities to be performed.

MENU

The keypad has the following functionality:

Button

Function

Alternate Function

MENU

MENU

Open / Close Menu

Password

UP

Next / Increase

1

DOWN

Previous / Decrease

2

ENTER

Accept selection

3

This section of the manual discusses how the available menu options can be
accessed, how the associated parameter may be changed via the selected
menu option and what effect the change to the parameter has on the
operation of the FGD10B gas detector.

Note: It is important that that the FGD10B is correctly configured for the
sensor in use, prior to performing any feature available in the menu system.

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4.6. Menu Mode Selection

The external Calibration / Configuration Keypad is used in its simplest form to calibrate
the sensor for zero or gas drift.

It may also be used to configure the FGD10b.
The following features are available via the Calibration / Configuration Keypad menu

system: -

Menu Option

E : 1 – Sensor Zero

E : 2 – Sensor Span

E : 4 – Output Zero (4mA)

E : 3 – Sensor FSD

E : 5 – Output Span (20mA)

E : 9 – Diagnostics

E : 17 – Sensor Gain

E : 19 – Positive zero suppression

E : 20 – Negative zero suppression

E : 25 – Zero temperature compensation +ve

E : 34 – Span temperature compensation +ve

E : 35 – Span temperature compensation -ve

E : 36 – Zero temperature compensation -ve

E : 77 – Firmware version

The menu options are selected as follows:

• Press the MENU button, E: 1 appears on the display.

• Press or until the required menu option is displayed, see

following options.

• Press to select the menu option.

• To exit the menu press MENU.

While the instrument is in menu mode – any data displayed on the screen will alternate
between the menu number and the reading.

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4.6.1. E : 1 – Sensor Zero

Refer to section 5.1.1. for sensor calibration details.

4.6.2. E : 2 – Sensor Span

Refer to section 5.1.2. for sensor calibration details.

4.6.3. E : 3 – Sensor Fsd

This Feature sets the FSD of the instrument. It must be matched to the
sensor.

• Press MENU to open the menu system.

• Using the or buttons, select menu option: E:3

• Press .

• Using the or buttons, change the display to the required

setting.

• Press to store the new value.
Note: Pressing the MENU button rather than the button

exits without any change.

• Press MENU to close the menu system.

4.6.4. E : 4 – Output Zero (4mA)

Refer to section 5.2.1. for output calibration details.

4.6.5. E : 5 – Output Span (20mA)

Refer to section 5.2.2. for output calibration details.

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4.6.6. E : 8 – Sensor Type

There are two types of sensor that can be fitted, either an oxygen or electrochemical.

• Press MENU to open the menu system.

• Using the or buttons, select menu option: E:8

• Press .

• Using the or buttons, set the required sensor type.

• Press to store the new value.

Note: Pressing the MENU button rather than the button
exits without any change.

• Press MENU to close the menu system.

Note: This option will restore the sensor to the factory default values. The user
must set all

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4.6.7. E : 9 – Engineer diagnostics

This feature is a view-only feature. No configuration changes are possible
from within this menu.

The information is for use of Status Scientific Controls personnel.

• From the menu system select menu option: E: 9 and press
.

• Using the or buttons, display the required setting. The

displayed values are as follows:

E : 90 Reading
E : 91 Current sensor temperature °C
E : 92 Sensor AtoD counts
E : 96 Status flags

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4.6.8. E : 17 – Sensor gain

This feature is used to set up the gain of the electronics to match the range
and sensor type. The range is 0 to 31, where 0 is the lowest gain and 31 is
the highest gain.

The gain setting should be kept as low as possible. The gain settings are
based on the first stage having a gain of 61.6 (2000 / 33).

Typical settings:

Sensor Type

Max output

(nA/ppm)

Make

Range

Resolution

(display)

Units

Gain

H2S

180

Ind. Sci.

0-50

0.05

ppm

10

H2S

180

Ind. Sci.

0-100

0.1

ppm 6 H2S

180

Ind. Sci.

0-200

0.5

ppm 2 H2S

180

Ind. Sci.

0-500

1

ppm 0 H2S(L)

450

Surecell

0-50

0.05

ppm 4 H2S(L)

450

Surecell

0-100

0.1

ppm 2 H2S(L)

450

Surecell

0-300

0.5

ppm 0 H2S(4HS)

850

City Tech

0-50

0.05

ppm 2 H2S(4HS)

850

City Tech

0-250

0.1

ppm 0 CO

90

Ind. Sci.

0-200

0.2

ppm 6 CO

90

Ind. Sci.

0-500

0.5

ppm 2 CO

90

Ind. Sci.

0-1000

1

ppm 0 CO(M)

85

Surecell

0-200

0.2

ppm 6 CO(M)

85

Surecell

0-500

0.5

ppm 2 CO(M)

85

Surecell

0-1000

1

ppm 0 CO(4CF)

85

City Tech

0-200

0.2

ppm 6 CO(4CF)

85

City Tech

0-500

0.5

ppm 2 CO(4CF)

85

City Tech

0-1000

1

ppm 0 NH3(100SE)

160

Sensoric

0-100

0.1

ppm

6

NH3(1000SE)

12

Sensoric

0-1000

1

ppm

10

SO2(4S)

600

City Tech

0-20

0.02

ppm

15

Note: NH3 Sensors can have a T

90

of several minutes when protected by a sinter

and should not be used in time sensitive applications. Low levels may not

be detected.

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4.6.9. E : 19 – Positive Zero Suppression

This option is used to allow the user to suppress small amounts of positive
sensor zero drift. The setting can be set between 0 and 10% of the sensor
range as set by the FSD value.

• Press MENU to open the menu system.

• Using the or buttons, select menu option: E:19

• Press .

• Using the or buttons, set the required zero suppression

value.

• Press ENTER to store the new value.
Note: Pressing the MENU button rather than the R button

exits without any change.

• Press MENU to close the menu system.

4.6.10. E : 20 – Negative Zero Suppression

This option is used to allow the user to suppress small amounts of negative
sensor zero drift. The setting can be set between 0 and -10% of the sensor
range as set by the FSD value.

• Press MENU to open the menu system.

• Using the or buttons, select menu option: E:20

• Press .

• Using the or buttons, set the required zero suppression

value.

• Press to store the new value.
Note: Pressing the MENU button rather than the button

exits without any change.

• Press MENU to close the menu system.

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4.6.11. E : 25 – Positive Zero Temperature Compensation

This option has no effect on the sensor version 1.0.3

4.6.12. E : 34 – Positive Span Temperature Compensation

This option has no effect on the sensor version 1.0.3

4.6.13. E : 35 – Negative Span Temperature Compensation

This option has no effect on the sensor version 1.0.3

4.6.14. E : 36 – Positive Zero Temperature Compensation

This option has no effect on the sensor version 1.0.3.

4.6.15. E : 77 – Firmware Version

The FGD10b Firmware version is displayed.

• Press MENU to close the menu system.

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5. CALIBRATION

5.1. Sensor Calibration

This feature allows the sensor to be calibrated. Ensure that the correct
sensor type is selected in the configuration prior to calibration. Refer to
section 4.6. for details of the menu system operation.

Note: if the password is in operation then the user will be prompted with

PASS when ever the menu key is pressed. Pressing the MENU key
again will result in the restricted user access, i.e. only the zero and
span options will be available. Entering the correct password will
give access to the full menu facility.

5.1.1. Sensor Zero

• From the menu system select menu option: E: 1 and press

.

• Ensure the sensor is in a zero-gas environment.

Note: Where a purging gas has to be applied, use a flow rate of
between 500 and 1000cc/min. Allow sufficient time for the
sensor to respond.

• Press to zero the sensor, ‘– – – –‘ will be displayed to
confirm the sensor zero has been performed.

Note: Pressing MENU rather than exits the zero feature
without performing the calibration.

• Press MENU to close the menu system.

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5.1.2. Sensor Span

Always zero the sensor prior to performing a span operation.

• From the menu system select menu option: E: 2 and press

.

• Apply a known concentration of gas (applicable to sensor type)
at a flow rate of between 500 and 1000cc/min. Allow time for
the sensor to respond.

• Using the and buttons, set the reading to that of the
calibration gas level.

• Press to span the sensor, ‘– – – –‘ will be displayed to
confirm the sensor span has been performed.

Note: pressing MENU rather than ENTER exits the span
feature without performing the calibration.

Wait until the reading is stable, if necessary press again
to span the sensor.

• Press MENU to close the menu system.

• Turn off and disconnect the calibration gas.

Note: NH3 Sensors can take several minutes to respond. Low levels may not

be detected.

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5.2. Analogue Output Calibration

The analogue output is that of a current source. In order to calibrate the
output it is necessary to monitor the output signal. This can be performed in
one of two ways:

Current measurement:

Connect an ammeter (or multimeter set to measure current in the mA range)
in series with the analogue output.

Advantage: Direct measurement of output.
Disadvantage: The analogue output has to be disconnected to allow the

connection of the meter.

Voltage measurement:

Permanently connect a 10R resistor in series with the analogue output.
When calibration is required, connect a voltmeter (or multimeter set to
measure voltage in the mV range) across the 10R resistor.

Advantage: No need to disturb wiring between FGD10B and control

unit.

Disadvantage: Measurement accuracy dependent upon resistor tolerance.

–
+

FGD10
Analogue Output
(4 – 20mA)

Control

Unit

mA

Meter range:

0.004A – 0.020A
4mA – 20mA

–
+

FGD10
Analogue Output
(4 – 20mA)

Control

Unit

10R

mV

+

Meter range:

0.04V – 0.20V
40mV – 200mV

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5.2.1. Analogue Output Zero

• Monitor the current sourced from the analogue output of the
FGD10B using a suitable method.

• From the menu system select menu option: E: 4 and press

.

• Using the and buttons; adjust the output to the required
level (4mA or 40mV).

• Press .

Note: Pressing MENU rather than exits the zero feature
without performing the calibration.

• Press MENU to close the menu system.

5.2.2. Analogue Output Span

Always zero the analogue output prior to performing a span operation.

• From the menu system select menu option: E: 5 and press

(button 4).

• Using the and buttons; adjust the output to the required
level.

• Press .

Note: Pressing MENU rather than exits the span feature
without performing the calibration.

• Press MENU to close the menu system.

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6. ROUTINE GAS TESTING

Refer to Figure 7, which shows the arrangement for applying the test gas to the
FGD10B.

1. Before application of the test gas, check that the associated control panel
reads zero with no known gas present in the atmosphere. If necessary, carry
out adjustment of the zero setting as described in section Sensor Zero.

2. Apply the test gas and allow a sufficient time for the sample to reach the gas
detector. The response time will vary according to the length of the sampling
tube.

3. Record the time taken for the gas detector to provide a reading of 90% (T90)
of its final value (e.g. to reach 45ppm when using a 50ppm H2S test gas). This
reading should be retained for future reference as it can provide an indication
of the health of the sinter (flame arrestor). This is situated in the base of sensor
housing and it is through this device that the gas passes in order to reach the
sensor itself. If necessary, carry out adjustment of the span setting as
described in section 5.1.2. .

Carrying out the above procedure, and comparing the results with previous
readings, will confirm that the FGD10B is functioning correctly, both
physically and electrically.

In the unlikely event that the response time is seen to be increasing, when
comparing periodic readings, it is advisable to change the unit so that it can
be checked.

The period between carrying out routine gas testing shall be in accordance
with the customer’s specification.

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7. SENSOR REPLACEMENT

7.1. Oxygen / Toxic sensor

Step1

Turn cover securing stud clockwise to allow cover to open.

Step 2

Remove cover by rotating anti-clockwise

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Step 3

Disconnect sensor wires and remove the main PCB.

Step 4

Remove sensor insert using extraction tool

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Step 5

Separate the two sensor insert components.

Once separated remove old sensor and replace with a new
sensor and mate the two component parts.

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Step 6

Apply Loctite 243 or a compound equal strength to the threads Insert the
sensor housing into the FGD10B enclosure using the insertion tool.

Loctite

Step 7

Terminate the wires

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Step 8

Replace cover and fully tighten.

Step 9

Turn the cover securing stud anti clockwise until the stud is in tight contact
with the cover.

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8. FUSES

A 340 mA polyfuse is located within the FGD10B. It will automatically reset
when normal conditions return.

9. SPECIFICATION

Materials

:

Instrument Body – Aluminium Pressure Die Casting
Sensor Insert – Stainless Steel Grade 316
Weather guard – Stainless Steel Grade 304 & Nylon 66

Cable entries

:

2 x 20mm or 2 x ½NPT or 2 x ¾ NPT

Weights

:

FGD10B (excluding weather guard) – 0.75Kg
Weather guard – 200 grams

Sensor type

:

Electrochemical

Input voltage

:

8 to 24 volts dc

Input power

:

5 Watts maximum

Internal fuse

:

340mA 'Nanofuse'

Analogue
output

:

4 to 20mA (10 bit resolution)

Comms output

:

Communications with hand-held calibration keypad at
38400 baud (3V logic)

Measurement
range

:

Depends upon sensor type

Response time

:

Typically T90 < 40 sec, depends upon sensor type.

NH3 Sensors can have a T

90

of several minutes

IP rating

:

Enclosure IP68, Sensor IP65

Display /
Keypad

:

External via internal connector

Operating
temperature

:

- 20 to +60 O C

Humidity range

:

0 to 95% RH non-condensing

Operating
pressure

:

Atmospheric + or - 10%

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10. DIMENSIONS

Optional
Weatherguard

104

108 Centres

160

104

2 x 7mm dia.

mounting holes

Maximum Depth = 127mm

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11. CERTIFICATION

The FGD10 Series of Gas Detectors are ATEX and IECEx certified for use in
potentially explosive atmospheres and is marked as follows:-

** Denotes additional characters that define the gas detector configuration
e.g. Enclosure type and sensor arrangement.

YYYY – Denotes year of manufacture.

Special Conditions of Safe Use

1. The gap between the SI-IR sensor and its housing in the gas
detector is 0.11mm maximum and should not be enlarged during
maintenance etc.

2. Only Loctite 243 or a compound equal strength shall be re-applied
to the threads of the type SI-M sensor after replacing the sensing
element.

3. The SI-IR sensors shall not be installed or removed when an
explosive gas atmosphere is present.

WARNING – DO NOT OPEN WHEN AN EXPLOSIVE GAS

ATMOSPHERE IS PRESENT

GAS DETECTOR TYPE FGD10 **

STATUS SCIENTIFIC IECEx SIR 08.0009X
CONTROLS LTD. T4 (Ta -20

O

C to +60OC)

MANSFIELD T5 (Ta -20

O

C to +50OC)

NG18 5ER.UK. T6 (Ta -20

O

C to +35OC)
II 2 G Ex d IIC 1180
SIRA 08ATEX1031X

SERIAL No. XXXXXX CIRCUIT RATING: 24VDC, 5W
YYYY RELAY CONTACT RATING:

300VAC. 3A MAX.

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Compliance with the Essential Health and Safety Requirements has been
assured by compliance with:

EN 60079-0: 2018 EN 60079-1 : 2014

Electrical data

Power supply - 8Vdc to 24Vdc, 5W

Installation instructions

The cable entry devices and blanking elements of unused apertures shall be
of a certified flameproof type, suitable for the conditions of use and correctly
installed.

With the use of conduit, a suitable certified sealing device such as a stopping
box with compound shall be provided immediately at the entrance to the
flameproof enclosure.

A copy of the certificate is available for download from:-

www.status-scientific.com

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CUSTOMER NOTES

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