Ametek Land Fibroptic FG User manual

Fibroptic Model FG Thermometer
with Emissivity Adjustment
© Land Instruments International, 2012
User Guide
Issue 6: September 2012
Publication Nº 198.052
Language: English

Health and Safety Information
Read all of the instructions in this booklet - including all the WARNINGS and CAUTIONS
- before using this product. If there is any instruction which you do not understand.
DO NOT USE THE PRODUCT.
Safety Signs
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or
personal injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, could result in minor or
moderate injury to the user or users, or result in damage to the product or to property.
NOTE
Indicates a potentially hazardous situation which, if not avoided, could result in damage or the loss of
data.
Equipment Operation
Use of this instrument in a manner not specied by Land Instruments International may be hazardous.
Read and understand the user documentation supplied before installing and operating the equipment.
Protective Clothing, Face and Eye Protection
It is possible that this equipment is to be installed on, or near to, machinery or equipment operating at
high temperatures and high pressures. Suitable protective clothing, along with face and eye protection
must be worn. Refer to the health and safety guidelines for the machinery/equipment before installing
this product. If in doubt, contact Land Instruments International.
Electrical Power Supply
Before working on the electrical connections, all of the electrical power lines to the equipment must
be isolated. All the electrical cables and signal cables must be connected exactly as indicated in these
operating instructions. If in doubt, contact Land Instruments International.
Storage
The instrument should be stored in its packaging, in a dry sheltered area.
Unpacking
Check all packages for external signs of damage. Check the contents against the packing note.
Lifting Instructions
Where items are too heavy to be lifted manually, use suitably rated lifting equipment. Refer to the
Technical Specication for weights. All lifting should be done as stated in local regulations.
IMPORTANT INFORMATION - PLEASE READ

Contact Us
UK - Droneld
Land Instruments International
Tel: [phone]
E-Mail: [email protected].uk
Web: www.landinst.com
USA - Pittsburgh
AMETEK Land, Inc.
Tel: [phone]
E-Mail: [email protected]
Web: www.ametek-land.com
For further details on all LAND/Ametek ofces, distributors and representatives, please visit
our websites.
Return of Damaged Goods
IMPORTANT If any item has been damaged in transit, this should be reported to the carrier and to the
supplier immediately. Damage caused in transit is the responsibility of the carrier not the supplier.
DO NOT RETURN a damaged instrument to the sender as the carrier will not then consider a claim. Save
the packing with the damaged article for inspection by the carrier.
Return of Goods for Repair
If you need to return goods for repair please contact our Customer Service Department. They will be
able to advise you on the correct returns procedure.
Any item returned to Land Instruments International should be adequately packaged to prevent damage
during transit.
You must include a written report of the problem together with your own name and contact information,
address, telephone number, email address etc.
Design and Manufacturing Standards
The Quality Management System of Land Instruments International is approved to BS EN ISO 9001 for
the design, manufacture and on-site servicing of combustion, environmental monitoring and non-contact
temperature measuring instrumentation.
Approvals apply in the USA
This instrument complies with current European directives relating to Electromagnetic
Compatibility 89/336/EEC and Low Voltage Directive 73/23/EEC.
Operation of radio transmitters, telephones or other electrical/electronic devices in close proximity
to the equipment while the enclosure doors of the instrument or its peripherals are open, may cause
interference and possible failure where the radiated emissions exceed the EMC directive.
The protection provided by both CE and IP classications to this product may be invalidated if alterations
or additions are made to the structural, electrical, mechanical or pneumatic parts of this system. Such
changes may also invalidate the standard terms of warranty.
Copyright
This manual is provided as an aid to owners of Land Instruments International’s products and contains
information proprietary to Land Instruments International. This manual may not, in whole or part, be
copied, or reproduced without the expressed written consent of Land Instruments International Ltd.
Copyright © 2012 Land Instruments International.

Fibroptic Model FG Thermometer User Guide

User Guide Fibroptic Model FG Thermometer
Contents
1 Introduction 1
2 Specication 2
3 Installation 3
3.1 Positioning the Optic Head 3
3.2 Mounting Assemblies 3
3.3 Positioning the Processor 4
4 Dimensional Information 7
4.1 Optic Head dimensions 7
4.2 Processor dimensions 7
5 Electrical Connections 8
5.1 Power supply connections 8
5.2 Display connections 9
5.3 Cable requirements 10
5.4 Screening and earthing details 10
6 Checking the System 11
6.1 Over voltage protection 11
6.2 Using the TEST switch 11
6.3 Setting the Emissivity 12
6.4 Emissivity Tables 13
7 Maintenance 14
7.1 Lens assembly maintenance 14
7.2 Flexible lightguide maintenance 14
7.3 Processor maintenance 14
8 System Output 15

Fibroptic Model FG Thermometer User Guide
Fig. 1-1 Fibroptic Model FG Thermometer

Page 1
User Guide Fibroptic Model FG Thermometer
1 Introduction
Fibroptic Model FG is a bre optics based radiation thermometer, intended prima-
rily for use in the glass industry on forehearths, reners and melters.
The thermometer is designed to provide accurate and stable temperature meas-
urement. Five models are available covering the ranges: 980 to 1300°C, 1000 to
1400°C, 1200 to 1650°C, 1800 to 2400°F and 2200 to 3000°F.
The thermometer comprises an optic head and light guide assembly, coupled to a
detector/processing assembly.
The key features of Fibroptic Model FG are:
1) A 4 to 20mA linear temperature sensor, powered on a two wire loop.
2) A test function which allows the thermometer, interconnections and indicator
to be functionally checked.
3) High accuracy linearisation.
4) Very low drift with ambient temperature and time.
5) Over-voltage protection.
6) Adjustable emissivity setting, in the range 0.10 to 1.00

Page 2
Fibroptic Model FG Thermometer User Guide
2 Specification
Measurement Ranges
Fibroptic Model FG 9.8/13C : 980 to 1300°C
Fibroptic Model FG 10/14C : 1000 to 1400°C
Fibroptic Model FG 12/16.5C : 1200 to 1650°C
Fibroptic Model FG 18/24F : 1800 to 2400°F
Fibroptic Model FG 22/30F : 2200 to 3000°F
Optic Head
Lens aperture : 10mm/0.4in
Sighting angle : 100:1 (0.57°) (nominal)
Focusing distance : innity (nominal)
Maximum ambient temperature : 200°C/392°F
Light Guide
Length : 6.1m/20ft
Minimum bend radius : 50mm/2.0in
Maximum ambient temperature : 175°C/347°F
Processor
Detector : Silicon photovoltaic cell, 0.7 to 1µm
Output : Linear 4 to 20 mA
Response time : 0.5s
Maximum loop resistance : 1 kW
Accuracy:
Resolution : <0.1°C/<0.2°F
Temperature coefcient : <0.04°/° mid span
: <0.07°/° extremities
Linearisation conformity : <0.5°C/<1.0°F
Interchangeability : ±2°C/±4°F
Absolute accuracy : 5°C/9°F
Ambient temperature limits : 10 to 60°C/50 to 140°F
Power supply : 24V dc (nominal) 18 to 40 Volts
across the instrument terminals
System test output : 1275°C/2325°F ± 3°C/5°F indicated
temperature in test mode.
Emissivity : Adjustable in the range 0.10 to 1.00
in steps of 0.01

Page 3
User Guide Fibroptic Model FG Thermometer
3 Installation
3.1 Positioning the Optic Head
Refer to Fig. 3-1 for the target size table. The thermometer has a circular eld of
view with a conical sight path. The eld of view is 100:1.
To mount the optic head, use the two clamping nuts on the external M16 thread
of the optic head.
NOTES
When installing the optic head, ensure that the target lls the eld of view
at the chosen distance.
If possible, mount the optic head so that the line of sight is at right angles
to the target surface.
Ensure that the sight path is not obstructed or obscured.
Fig. 3-1 Target Size Diagram
3.2 Mounting Assemblies
A special air purge assembly, Part Nº 091.446, provides air purging and a quick,
no-tools disconnection facility for the Fibroptic Model FG thermometer.
The “Universal” adapter (Part Nº 028.825) enables the air purge assembly (Part
Nº 091.446) to be attached to other manufacturer’s ttings (e.g. Leeds & North-
rup and Honeywell). Refer to Fig. 3-3.
The Adapter (Part Nº 028.826) enables the air purge assembly (Part Nº 091.446)
to be connected to Land refractory sighting tubes type STO. Refer to Fig. 3-4.
Fig. 3-2 shows the complete range of Fibroptic Thermometer optic head mounting
accessories.
10/0.4 15/0.6 20/0.8 30/1.2 60/2.4
0 500/19.7 1000/39.4 2000/78.7 5000/196.9
Target Distance mm/in
Target Diameter mm/in
Target Diameter = Distance + 10mm/0.4in
100

Page 4
Fibroptic Model FG Thermometer User Guide
3.2.1 Installing the Model FG thermometer in a mounting assembly
1) Bolt the adapter securely to the air purge assembly via the three holes in
the lower ange of the air purge casting.
It is possible that the air purge assembly will be supplied as Part Nº
091.274 (ready tted with a simple right-angle bracket) or as Part Nº
091.262 (tted with an adjustable ange)
2) Disconnect the quick release adapter (028.823) from the bayonet tting on
the air purge assembly by rotating the adapter anti-clockwise.
3) Screw the adapter fully on to the M16 threaded optic head until it is trapped
lightly against the optic head lock nuts (Refer to Fig. 3-2).
4) Fasten the air purge assembly securely to a supporting member.
5) Connect a supply of clean air and establish a ow rate of approximately
1ltr/s/2.12cu.ft/min.
6) Connect the optic head to the air purge assembly via the bayonet tting.
3.3 Positioning the Processor
Warning
Risk of electric shock. Ensure that the processor is disconnected from the
power supply before removing the lid of the processor.
Caution
The Fibroptic Model FG Thermometer processor contains components
which can be damaged by an electrostatic discharge. Always ground n-
gers or screwdrivers before touching internal components (including con-
nector terminals and the test switch).
The bre optic light guide linking the optic head with the processor allows the
processor to be positioned in a safe place up to 6.1m/20ft from the measurement
point. The minimum bend radius of the exible lightguide is 50mm/2in.
1) To prevent the lightguide fouling machinery or causing a hazard, secure it
along its length to suitable points on the installation.
2) Do not strain the lightguide along its length when installing the thermometer.
3) Do not allow the lightguide to be immersed in oil or water etc.
The processor has four corner mounting screw holes through the base of
the box which allows it to be mounted securely on a wall, rack or console.
The holes are on 148mm/5.83in x 45mm/1.77in centres. The mounting
screw holes clearances are shown on the dimensional drawing, Fig. 4-2.
4) To gain access to the mounting screw holes, unscrew the four screws in the
lid of the processor and remove the lid.
5) Use 4.5mm/0.18in diameter screws through the mounting holes to secure
the processor in the required location.
6) Replace the processor lid and tighten the screws.

Page 5
User Guide Fibroptic Model FG Thermometer
Fig. 3-2 Optic head mounting accessories
Optic Head
Purge air inlet dia 6.35/0.25
Air Purge (Part Nº 091.446)
3 screws M4 x 10/0.39 CSK/HD
L&N/Honeywell Adapter Air Purge (Part Nº 028.825)
1 hole dia 34.0/1.34
Hinged Adjustable Mounting Plate (Part Nº 091.274)
4 holes dia 6.5/0.26
101.6/4.0
127.0/5.0
76.2/3.0
127.0/5.0
12.7/0.5
105.0/4.13
50.0/
1.97
4 holes dia 6.5/0.26
100.0/3.94
145.0/5.71
80.0/3.15
40.0/
1.57
Quick Release Purge & Bracket (Part Nº 091.274)
1 hole dia
11.0/0.43
Purge air inlet
dia 6.35/0.25
6.35/0.25 145.0/5.71
Purge air inlet
dia 6.35/0.25
4 holes dia 7.2/0.28
equi-spaced on
101.6/4.0 pcd
Quick Release Purge & Flange (Part Nº 091.262)
dia 127.0/5.0
Notes: When choosing a location for the Fibroptic ther- mometer mounting, ensure that the target fills the field of view of the optic head at the chosen targte distance. (Refer to the Target Size Tables). Air purge flow rate: 1 l per s / 12ft³ per min Air purge pressure: 0.1 Atmosphere / 0.1 bar All dimensions in mm/in

Page 6
Fibroptic Model FG Thermometer User Guide
Fig. 3-2 Dimensions of the Universal Adapter
Fig. 3-3 Dimensions of the adapter plate for STO sighting tubes
3 x screws M4 x
10/0.4 CSK/HD
1 hole dia.
34.0/1.3
All dimensions in millimetres/inches
All dimensions in millimetres/inches
4 holes dia 7.2/0.28 equi-spaced
on 101.6/4.0 pcd
3 holes dia 7.2/0.28 equi-spaced
on 98.4/3.87 pcd
3 holes M4 x 0.7P equi-spaced
on 54.0/2.13 pcd
127.0/5.0
11.4/0.45
3.7/0.15
57.0/2.24 dia
34.0/1.34 dia

Page 7
User Guide Fibroptic Model FG Thermometer
4 Dimensional Information
4.1 Optic Head dimensions
Fig. 4-1 Optic Head dimensions
4.2 Processor dimensions
Fig. 4-2 Processor dimensions
All dimensions in millimetres/inches
106.5/4.19
17.5/0.69
18.5/0.73 dia
M16 x 1.0P
13.0/0.51 dia
All dimensions in millimetres/inches
75.0/2.95
45.0/1.77 CTRS
M20 x 1.5P
thread 148/5.83
Mounting holes
dia 4.5/0.18
160/6.30
27.0/1.06 30.0/1.18

Page 8
Fibroptic Model FG Thermometer User Guide
5 Electrical Connections
Warning
Risk of electric shock. Ensure that the processor is disconnected from the
power supply before removing the lid of the processor.
5.1 Power supply connections
The Model FG Processor requires a power supply of between 18 and 40V d.c.
(24V d.c. nominal). The range of permissible power supply voltages in relation to
the loop resistance is given in Fig. 5-1.
Warning
In order to meet IEC 1010 safety requirements, the power supply output
must be double isolated from any hazardous, live voltages.
Fig. 5-1 Power Supply Voltage in Relation to Loop Resistance
1) Connect the processor, power supply and indicator in a 2-wire current loop
with the indicator in the negative conductor. Refer to Fig. 5-2.
Note
Ensure that the indicator is connected to the negative conductor.
2) Connect the positive and negative conductors to the thermometer to the
terminals marked + and - on the terminal strip as indicated in Fig. 5-2.
An automatic polarity correction facility is incorporated so that the
conductors may be connected to either terminal. The third terminal, marked
S, is provided for screen connections as required. Refer to Section 5.4.
20 25 30 35 4018
38 44
1000
750
500
250
0
Power Supply Output (V)
Loop Resistance (ohms)

Page 9
User Guide Fibroptic Model FG Thermometer
Fig. 5-2 Electrical connections of the 4 to 20mA current loop
5.2 Display connections
Warning
In order to meet IEC 1010 safety requirements, the power supply output
must be double isolated from any hazardous, live voltages.
The Model FG thermometer can be connected directly to most readout, recording,
control or computer equipment. The display device must be scaled for the 4 to
20mA signal to correspond with 4mA for Tmin and 20mA for Tmax for the ther-
mometer connected. Refer to Table 5-1.
Thermometer Model Tmin Tmax
Fibroptic Model FG 9.8/13C 980°C 1300°C
Fibroptic Model FG 18/24F 1800°F 2400°F
Fibroptic Model FG 10/14C 1000°C 1400°C
Fibroptic Model FG 12/16.5C 1200°C 1650°C
Fibroptic Model FG 22/30F 2200°F 3000°F
4mA 20mA
Table 5-1 - Tmax and Tmin Values
Note
If the thermometer is sighted on a target where temperature is below
Tmin, the output will fall below 4mA (possibly as low as 2.8mA, depending
on the ambient temperature). In this case, the accuracy of the displayed
reading may be reduced.
Digital Panel Meter
Power Supply Unit
4 to 20mA

Page 10
Fibroptic Model FG Thermometer User Guide
5.3 Cable requirements
Note
To comply with EMC requirements, the thermometer must be used with
screened cable.
The maximum overall cable diameter must not exceed 8mm/0.3in.
For short cable runs, when general interference is unlikely, use standard PVC 2
Core cable (BELDEN 2576 or equivalent).
For longer runs, or when interference is expected, use a screened cable (BELDEN
9302 or equivalent).
For extended high temperature environments, use a TEFLON insulated cable
(BELDEN 83319 or equivalent).
5.4 Screening and earthing details
Note
Screens or earth cores must be earthed at a single point on the indicator
unit.
The recommended implementation for multiple loops from a single isolated power
supply unit is shown schematically in Fig. 5-3.
Fig. 5-3 Screening and Earthing Arrangement
Fibroptic
Model FG
A
Fibroptic
Model FG
B
Indicator A
Indicator B
Isolated
24V d.c.
Power
Supply
L N E + -
L N E + -
L N E
+
-

Page 11
User Guide Fibroptic Model FG Thermometer
6 Checking the System
6.1 Over voltage protection
Warning
Take care when viewing the Over voltage indicator as, if it is lit, high (pos-
sibly mains) voltages are present on the exposed terminals.
The Model FG Thermometer is provided with supply over voltage protection. An
over voltage condition is indicated by illumination of LED 1, inside the processor
(Refer to Fig. 6-1). The over voltage loop current is limited to 40mA.
To check the LED;
1) Ensure that the thermometer is connected in a 4 to 20mA loop as shown in
Section 5.0.
2) Unscrew the four screws in the lid of the processor and remove the lid.
3) Refer to Fig. 6-1. If LED 1 is illuminated, an over voltage condition exists
and must be remedied as soon as possible.
Note
It is possible that, when over voltage levels are small or intermittent, the
signal loop current will be in error while the LED is not illuminated.
6.2 Using the TEST switch
Warning
Take extreme care when using the TEST switch, as high (possibly mains)
voltages are present on the exposed terminals.
The Model FG Thermometer is provided with a TEST switch. The location of the
switch is shown in Fig. 6-1. When the switch is set in the TEST position, the unit
is electrically self testing and will set its output to indicate 1275°C ± 3°C (Celsius
Models) or 2325°F ± 5°F (Fahrenheit Models).
Fig. 6-1 Location of ‘TEST’ switch, Emissivity adjustment and ‘Over voltage’ LED
0 0
Emissivity Adjustment ‘Over Voltage’ LED Indicator
‘Test’ Switch

Page 12
Fibroptic Model FG Thermometer User Guide
To test the unit:
1) Ensure that the thermometer is connected in a 4 to 20mA loop as shown in
Section 5.0.
2) Unscrew the four screws in the lid of the processor and remove the lid.
3) Refer to Fig. 6-1. Set the switch marked SIG/TEST to the TEST position.
4) Check that the temperature indicating equipment's display reads 1275°C
±3°C/2325°F ±5°F.
5) Set the switch marked SIG/TEST to the SIG position.
6) Replace the lid and tighten the four screws in the lid.
If the temperature display was not 1275°C ±3°C/2325°F ±5°F, check all the
electrical connections and repeat the test.
If the test can not be completed satisfactorily, check each item of equipment
(i.e. Power Supply, Indicator, Model FG Thermometer etc.). If the thermometer is
found to be faulty, contact Land Instruments International to arrange for repair.
6.3 Setting the Emissivity
To set the emissivity on a Model FG thermometer, the two emissivity pots (see
Fig. 6-1) on the main PCB should be manually set to correspond with the calcu-
lated emissivity value of the thermometer target. Refer to the emissivity tables
in Section 6.4.
To set an emissivity value:
1) Unscrew the four screws in the lid of the processor and remove the lid.
2) The factory default emissivity setting is 1.00. This is shown with each pot
set to ‘0’. To change the value, set each pot value accordingly (looking at
the pots with the ‘0’ uppermost).
ie. for a required value of : 0.73 - left pot set to 7, right pot set to 3
0.91 - left pot set to 9, right pot set to 1
3) Replace the processor lid and secure the four screws.
IMPORTANT NOTE
Interchangeability with ‘Original’ Model FG units
‘Original’ Model FG thermometers are permanently set, by default, to an
emissivity value of 1.00.
Units of Model FG with emissivity adjustment should therefore be set to
1.00 for optimum interchangeability with units of ‘original’ Model FG.

Page 13
User Guide Fibroptic Model FG Thermometer
6.4 Emissivity Tables
Metals
Material Emissivity
Aluminium 0.13
Oxidised 0.40
Chromium 0.43
Oxidised 0.75
Cobalt 0.32
Oxidised 0.70
Copper 0.06
Oxidised 0.85
Gold 0.05
Iron & Steel 0.35
Oxidised 0.85
Lead 0.35
Oxidised 0.65
Magnesium 0.27
Oxidised 0.75
Molybdenum 0.33
Oxidised 0.80
Nickel 0.35
Oxidised 0.85
Palladium 0.28
Platinum 0.27
Rhodium 0.25
Silver 0.05
Oxidised 0.10
Tin 0.40
Oxidised 0.60
Titanium 0.55
Oxidised 0.80
Tungsten 0.39
Zinc 0.50
Oxidised 0.60
Alloys
Material Emissivity
Brass 0.20
Oxidised 0.70
Chromel & Alumel 0.30
Oxidised 0.80
Constantin & Manganin 0.25
Oxidised 0.65
Inconel 0.30
Oxidised 0.85
Monel 0.25
Oxidised 0.70
Nichrome 0.30
Oxidised 0.85
Miscellaneous Materials
Material Emissivity
Asbestos (Board/Paper Cloth) 0.90
Asphalt 0.85
Carbon Graphite 0.85
Soot 0.95
Cement & Concrete 0.65
Cloth (all types - close weave)
(Open weave reduces emissivity)
0.75
Glass 3mm thick -
6mm thick -
12mm thick -
20mm thick 0.80
Miscellaneous Materials
Material Emissivity
Alumina 0.30
Brick Red 0.80
White refractory 0.30
Silica 0.55
Sillimanite 0.60
Ceramics 0.40
Magnesite -

Page 14
Fibroptic Model FG Thermometer User Guide
7 Maintenance
7.1 Lens assembly maintenance
After initial installation, make frequent regular inspections of the lens in order to
establish a cleaning cycle.
It may be necessary to remove the optic head from its mounting to gain
reasonable access to the lens.
If necessary, clean the lens with a soft cloth and a suitable lens cleaning uid.
7.2 Flexible lightguide maintenance
Make regular checks of the lightguide to ensure that it no part of it is fouling
machinery or being abraded during operation.
7.3 Processor maintenance
The only periodic maintenance necessary with the processor is to ensure that it is
mounted securely and the lid fastened correctly.