Ametek Land RT8B User manual

Low Temperature Standalone Thermometer
i
RT8B THERMOMETER
USER GUIDE
PUBLICATION NO815692
LANGUAGE: ENGLISH
ISSUE: 1
DATE: 14 SEPTEMBER 2022
QUALITY CUSTOMER SOLUTIONS

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 loss of data.
Signs and Symbols used on equipment and Documentation
Caution, risk of electric shock.
Caution, attention to possibility of risk of damage to the product, process or surroundings. Refer
to instruction manual.
Caution, hot surface.
Protective Conductor Terminal.
Observe precautions for handling electrostatic discharge sensitive devices.
Equipment Operation
Use of this instrument in a manner not specied by AMETEK Land may be hazardous. Read and
understand the user documentation supplied before installing and operating the equipment.
The safety of any system incorporating this equipment is the responsibility of the assembler.
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 AMETEK Land.
Wear Protective Gloves Wear Protective Clothing
Wear Eye Protection Wear Ear Protection
Wear Safety Boots Wear Face Protection
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 AMETEK Land.
IMPORTANT INFORMATION - PLEASE READ

For further details on all AMETEK Land offices, distributors and representatives, please visit our website.
Storage
The instrument should be stored in its packaging, in a dry sheltered area.
The maximum storage temperature is 10 °C (18 °F) higher than the maximum operating temperature. The
minimum storage temperature is 10 °C (18 °F) lower than the minimum operating temperature. Refer to
the Technical Specification for details of the operating temperature limits.
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 Specification for weights. All lifting should be carried out in accordance with local and national
regulations.
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 for details of the
correct returns procedure.
Any item returned to AMETEK Land 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.
Registered ISO 9001 Management System approvals apply in the USA.
UK Calibration Laboratory: UKAS 0034.
USA Calibration Laboratory: ANAB Accredited ISO/IEC 17025.
National Accreditation Board for Testing and Calibration Laboratories approvals apply in India.
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 this product may be invalidated if alterations or additions are made to the
structural, electrical, mechanical, pneumatic, software or firmware components of this system. Such
changes may also invalidate the standard terms of warranty.
Copyright
This manual is provided as an aid to owners of AMETEK Land’s products and contains information
proprietary to AMETEK Land. This manual may not, in whole or part, be copied, or reproduced without the
expressed written consent of AMETEK Land.

Low Temperature Thermometer
RT8B
User Guide
Contents
1 Introduction 1
1.1 General Introduction 1
1.2 About the RT8B thermometer 1
2 Instrument Specications 2
2.1 Specication Table 2
2.2 Thermometer Dimensions 3
2.3 Target Spot Size 3
2.4 Thermometer Installation 4
3 Electrical Connections 5
3.1 General Connections 5
3.2 Loop Resistance 6
4 Thermometer Operation 7
4.1 General 7
4.2 Location of Controls 7
4.3 Adjusting the ‘Emissivity’ Setting 8
4.4 Adjusting the Averager ‘Response Speed’ Setting 9
4.5 Settings Archive 9
5 Mountings and Accessories 10
5.1 General 10
5.2 Services 11
6 Maintenance 12
6.1 General 12
7 Emissivity 13
7.1 Refractories 13
7.2 Alloys 14
7.3 Miscellaneous 14
7.4 Metals 15

Low Temperature Thermometer RT8B
User Guide 1
1.1 General Introduction
This publication provides the necessary information required to safely operate the
AMETEK Land RT8B Thermometer.
It is important to fully check all equipment with which you have been supplied.
The equipment must only be used, maintained and serviced by suitably trained
personnel, capable of carefully following the procedures and guidelines given in this
User Guide.
This User Guide should be read thoroughly before proceeding with any operations
detailed within it and it is advisable that it is kept readily available, for reference when
the equipment is in general use.
1.2 About the RT8B thermometer
The AMETEK Land RT8B Thermometer is a highly accurate, non-contact infrared
thermometer, designed for independent or ‘stand alone’ applications.
The thermometer features include:
• stand alone operation
• adjustable response speed
• 4 to 20mA loop powered output, linear over the temperature span of
the instrument
• built-in emissivity controls
INTRODUCTION
1
Fig. 1 AMETEK Land RT8B thermometer

Low Temperature Thermometer
RT8B
User Guide
2
Operating Temperature Range:
(focused at innity)
RT80B
RT81B
RT82B
RT83B
0 to 250°C
0 to 500°F
0 to 500°C
0 to 1000°F
Specied Temperature Range: RT80B
RT81B
RT82B
RT83B
0 to 250°C
30 to 500°F
0 to 500°C
30 to 1000°F
Output: Linear 4 to 20mA over temperature range
Field of view: See section 2.2
Emissivity: 0.1 to 1.09 adjustable in steps of 0.01
Waveband: 8 to 14μm (nominal)
Response time(3t): 1 to 10s (adjustable)
Resolution: <0.2°C
Accuracy: <2°C
Ambient temperature limits: -5 to 50°C/23 to 122°F (specied)
-5 to 70°C/23 to 158°F (storage)
Drift with ambient temperature: <1.5° per 10° change in ambient temperature
Drift with time: <1°C (2°F) per year
Power supply voltage limits: 11 to 45V d.c. (26V d.c. nominal)
Maximum load resistance: 1KΩ
EMC: EN 50 082-2 (immunity)
EN 50 081-1 (emission)
IEC 61010 (electrical safety)
Sealing: Designed to meet IP65/NEMA4 requirements
Vibration: 3g any axis (10 to 300Hz)
Weight: 0.5kg/1.1lb
2.1 Specification Table
INSTRUMENT
SPECIFICATIONS
2

Low Temperature Thermometer RT8B
User Guide 3
2.2 Thermometer Dimensions
Fig. 2 RT8B thermometer dimensions
2.3 Target Spot Size
Fig. 3 RT8B thermometer target spot size table
114/4.49
80.5/3.17 158/6.22
Mounting pad: 2 holes, 1/4in BSW,
7/0.3 deep on 25/0.98 centres
All dimensions in mm/in
Not to scale
0.83 1.02 1.34 2.13 3.39 4.80 6.14
Minimum Target Size (mm)
Distance to Target (mm)
Minimum Target Size (in)
Distance to Target (in)
0 300 500 1000 1500 2000 2500
21 26 34 54 86 122 156
0 11.8 19.7 39.4 59.1 78.7 98.4

Low Temperature Thermometer
RT8B
User Guide
4
The AMETEK Land RT8B thermometer operates by sensing radiation from within a well
dened ‘eld of view’. The intersection of this eld of view with the intended target,
determines the ‘target spot’, the area where the temperature is measured. Fig. 3 shows
the RT8B thermometer target spot size table.
2.4 Thermometer Installation
The location of the RT8B thermometer should be carefully chosen, such that it is
easily accessible and in a position not unnecessarily exposed to heat, fumes or liquid
spray. The sight path between the thermometer and the target, should be as free as
possible from smoke, liquid spray and from the intrusion of machinery. The axis of
the thermometer should be at right angles to the target surface, however, an angle of
up to 45° from the normal is acceptable. It is also important that the intended target
completely lls the thermometer eld of view at the selected installed distance and
that no part of the sight path is obstructed.
NOTE
In some RT8B applications, a sighting tube may be required to eliminate any
unwanted reections from entering the thermometer and to keep the sight path
clear from obstructions. Sighting tubes can also be used to create a ‘stand-o’,
between the thermometer and the process under observation.
When selecting a suitable sighting tube, it is important to ensure that the internal
bore of the tube is at least 25% greater than the largest target spot size over the
tubes length. All distances must be measured from the thermometer datum, which
is located at the front of the thermometer.
When choosing a suitable location for mounting the RT8B thermometer, the following
criteria should be considered:
• If the installation area is not clean or free from dust, smoke or water spray,
then an AMETEK Land air purge system must be utilised to ensure that the
thermometer lens is kept free from such airborne contaminants. Ensure that a
suitably conditioned air supply is available.
• If the surrounding ambient temperatures of the installation area are outside
the thermometer specication, then an AMETEK Land water cooled protective
jacket must be utilised to ensure that the thermometer operates at the specied
ambient temperature. Ensure that a suitably conditioned water supply is available.

Low Temperature Thermometer RT8B
User Guide 5
3.1 General Connections
The electrical connections for the RT8B thermometer power supply and temperature
output are made via the 6-way socket on the rear of the thermometer (see Fig. 6).
The connection to the thermometer can be made via any of the following:
• Pre-wired 4m cable (AMETEK Land Part No. 029.673)
• 6-way plug (AMETEK Land Part No. 206.551)
• 6-way plug housed in protective jacket end cap (AMETEK Land Part No. 091.562)
Thermometer Pin Function Cable Colour End Cap Pin No.
1- - -
2- - -
3 V+, 4 to 20mA Red 5
4- - -
5- - -
6 V-, 4 to 20mA Black 6
To connect the 6-way plug to the RT8B thermometer (see Fig. 4):
• Align the red marker near the lugs of the plug, with the red marker
located above the keyway in the thermometer socket.
• Push the plug into the socket, ensuring that the locking sleeve slides
forwards, locking the plug to the socket.
To disconnect the 6-way plug to the RT8B thermometer:
• Grip the locking sleeve portion of the plug.
• Slide the locking sleeve rearwards to release the locking mechanism and
disconnect the plug from the thermometer socket.
ELECTRICAL
CONNECTIONS
3
Locking Sleeve
Lugs Keyway
Red Markers
Fig. 4 Connecting the 6-way plug to the RT8B Thermometer

Low Temperature Thermometer
RT8B
User Guide
6
3.2 Loop Resistance
The maximum allowable loop resistance in the RT8B thermometer current loop, for a
given power supply voltage, is illustrated in Fig. 5.
NOTE
The system load resistance includes the cable resistance and the indicator resistance.
Fig. 5 Graph showing load resistance versus power supply voltage
0 5 10 15 20 25 30 35
1000
900
800
700
600
500
400
300
200
100
0
Power Supply Voltage (V)
Maximum Loop Resistance (ohms)

Low Temperature Thermometer RT8B
User Guide 7
4.1 General
It is recommended that the ‘Emissivity’ and ‘Response Speed’ controls are set to
match the requirements of the specic application and measurement location, before
installation. This is particularly relevant if the thermometer is to be used in a location
which is dicult to access and/or is used in conjunction with a protective jacket and
back cap.
4.2 Location of Controls
The ‘Emissivity’ and ‘Response Speed’ control switches are located on the rear face of
the thermometer. The controls are protected by a screw-on cap (see Fig. 6).
NOTE
To ensure that the electronics of the thermometer are fully sealed against the
ingress of moisture and dirt, the screw-on cap covering the thermometer controls
must be replaced immediately after making any settings or adjustments.
Fig. 6 Location of RT8B thermometer controls screw-on cap
Screw-on cap covering
thermometer controls
Rear face of RT8B
thermometer
Electrical connector
Not to scale
THERMOMETER
OPERATION
4

Low Temperature Thermometer
RT8B
User Guide
8
4.3 Adjusting the ‘Emissivity’ Setting
To ensure that the AMETEK Land RT8B thermometer makes consistent accurate
temperature measurements, an emissivity correction value must be set in the
thermometer which accurately corresponds with the target under observation.
The emissivity value can be set in the range 0.1 to 1.09 in adjustable increments of
0.01. The thermometer is supplied with the emissivity value pre-set to 1.00.
To set the emissivity value:
• Remove the screw-on cap covering the control switches.
• Set the emissivity value using the ‘SW1’ and ‘SW2’ switches (see Fig. 7).
Switch ‘SW1’ denotes the rst gure after the decimal point of the emissivity value.
Switch ‘SW2’ denotes the second gure after the decimal point of the emissivity
value.
e.g. for an emissivity value of ‘0.87’, ‘SW1’ should be set to ‘8’ and ‘SW2’ should be set
to ‘7’.
When switch ‘SW1’ is set to ‘0’, this denotes a ‘1’ before and a ‘0’ after the decimal
point of the emissivity value.
e.g. for an emissivity value of 1.00, ‘SW1’ should be set to ‘0’ and ‘SW2’ should be set
to ‘0’.
• Ret the screw-on cap covering the control switches.
Fig. 7 RT8B Thermometer ‘Emissivity’ and ‘Response Speed’ Control
Emissivity
Example = 0.85
Response Speed
Fully anti-clockwise = 1sec (3t)
Fully clockwise = 10sec (3t)
SW2
SW1
P1 Example settings
Emissivity SW1 SW2
0.10 1 0
0.80 8 0
0.85 8 5
0.92 9 2
1.00 0 0
e=0.85

Low Temperature Thermometer RT8B
User Guide 9
4.4 Adjusting the Averager ‘Response Speed’ Setting
The response speed setting allows the time constant of the AMETEK Land RT8B
thermometer to be adjusted to suit the application. The response speed relates to
the signal output rate and gives an average reading over the duration of the response
speed time value and can be set via potentiometer P1 (see Fig. 7).
The averager response speed can be set to any value between 1 and 10 seconds (for 0
to 95% of the nal reading).
To increase the response speed value (i.e. make the response faster):
• Remove the screw-on cap covering the control switches.
• Turn the potentiometer ‘P1’ anti-clockwise. When ‘P1’ is turned fully
anti-clockwise, the response speed is 1 second (3t)
To decrease the response speed value (i.e. make the response slower):
• Remove the screw-on cap covering the control switches.
• Turn the potentiometer ‘P1’ clockwise. When ‘P1’ is turned fully
clockwise, the response speed is 10 seconds (3t).
• Ret the screw-on cap covering the control switches.
4.5 Settings Archive
It is recommended that any emissivity or response speed settings made, are recorded
and saved to archive. This allows future reference and quick traceability of settings
without having to access the instrument to check switch settings. When values for
emissivity and response speed are set, enter the information and values in the table
below:
Serial Number Date Emissivity Response Speed

Low Temperature Thermometer
RT8B
User Guide
10
5.1 General
A comprehensive range of mountings and accessories is available for the RT8B
thermometer, ensuring it is environmentally protected when utilised in hostile or
challenging applications.
NOTE
If the thermometer is to be used in an area of ambient temperature higher than
that specied, then the thermometer must be housed in a protective cooling
jacket. If the thermometer is to be used in an area where the atmosphere contains
a high proportion of dust/smoke/steam etc, then the thermometer must be used in
conjunction with an air purge system, to keep the thermometer lens clean and free
from contamination.
Fig. 8 Location of RT8B thermometer in protective jacket assembly
Sighting tube
mounting ange
Electrical
Connections
Position of RT8B thermometer
within protective jacket assembly
End cap
assembly
Cooling jacket
assembly
Air/water
cooling
Air purge
assembly
Not to scale
MOUNTINGS AND
ACCESSORIES
5

Low Temperature Thermometer RT8B
User Guide 11
Fig. 9 RT8B thermometer protective assembly dimensions
3x equi-spaced mounting
holes 6.5 to 7.0/0.26 to 0.28
clearance for M6 bolts
Thermometer removal clearance
Approx. 200/8.0
150/5.9 170/6.7 110/4.4
430/17.0
117/4.6
All dimensions in mm/in Not to scale
120/4.7
Side View
Top View
5.2 Services
When any cooling or purging accessories are utilised, it is important that the air and
water supply to these facilities are fully conditioned and supplied at the recommended
ow rates. The following information details the specied ow rates:
S4-J Cooling Jacket Assembly
Requirement: Conditioned water supply (clean and free from any contaminants) Flow
rate: 1ltr/min or 0.035cu.ft/min
S4-P Air Purge Assembly
Requirement: Conditioned air supply (clean and dry, free from any contaminants) Flow
rate: 1ltr/sec or 2cu.ft/min.
CAUTION
“Over-cooling” of the thermometer may cause a build-up of condensation
on or inside the instrument.
To prevent this, ensure that the water supply temperature is not lower
than the local dewpoint temperature.

Low Temperature Thermometer
RT8B
User Guide
12
MAINTENANCE
6
6.1 General
RT8B thermometer maintenance consists mainly of ensuring that the thermometer lens
is kept clean and free from contaminants and that all services to the system (water and
air supplies) are set correctly and are routinely checked.
It is recommended that routine checks of the RT8B thermometer system, are
incorporated into any local maintenance schedules.

Low Temperature Thermometer RT8B
User Guide 13
EMISSIVITY
7
In order to obtain accurate temperature measurements, the emissivity value of the
target surface must be known. This section of the RT8B Thermometer User Guide
contains typical emissivity values of the most commonly measured materials. Where
no emissivity value is quoted, this means that either the thermometer is not suitable
for the measurement application or the temperature of the target is outside the
thermometer’s measurement span. If you have a query regarding the emissivity
of the target in your measurement application, contact AMETEK Land Instruments
International for assistance.
7.1 Refractories
Refractories
Material Emissivity Value
Magnesite
oxidised
0.60
0.85
Brick
Red 0.90
White
Refractory 0.80
Silica 0.80
Sillimanite 0.60
Ceramics 0.90
Alumina 0.60
Fig. 10 Typical Emissivity Values for Refractories

Low Temperature Thermometer
RT8B
User Guide
14
7.2 Alloys
Alloys
Material Emissivity Value
Brass
Oxidised
0.30
0.60
Chromel & Alumel
Oxidised
0.30
0.80
Constantin & Manganin
Oxidised
0.05
0.35
Inconel
Oxidised
0.10
0.85
Monel
Oxidised
0.10
0.70
Nichrome
Oxidised
0.20
0.85
Fig. 11 - Typical Emissivity Values for Alloys
7.3 Miscellaneous
Miscellaneous
Material Emissivity Value
Asphalt 0.95
Asbestos (board/paper/cloth) 0.90
Brick Graphite
soot
0.85
0.80
0.95
Cement & Concrete 0.90
Cloth (all types - close weave)
[Open weave reduces emissivity] 0.85
Paper & Cardboard 0.80 to 0.95
Plastics opaque
transmission 0.1
transmission 0.4
0.85
0.75
0.45
Paints oils & enamels
lacquers
aluminium
0.90
0.85
0.30 to 0.60
Water depth > 50mm 0.95
Wood 0.85
Fig. 12 Typical Emissivity Values for Miscellaneous Materials

Low Temperature Thermometer RT8B
User Guide 15
7.4 Metals
Metals
Material Emissivity Value
Aluminium
Oxidised
0.03
0.35
Chromium
Oxidised
0.07
0.85
Cobalt
Oxidised
0.04
0.35
Copper
Oxidised
0.03
0.80
Gold 0.02
Iron & Steel
Oxidised
0.10
0.80
Lead
Oxidised
0.13
0.65
Magnesium
Oxidised
0.07
0.75
Molybdenum
Oxidised
0.10
0.80
Nickel
Oxidised
0.04
0.85
Palladium 0.05
Platinum 0.07
Rhodium 0.05
Silver
Oxidised
0.02
0.12
Tin
Oxidised
0.06
0.60
Titanium
Oxidised
0.15
0.60
Tungsten 0.06
Zinc 0.04
Fig. 13 Typical Emissivity Values for Metals

For a full list of international oces, please visit our website www.ametek-land.com
Copyright © 2022 LAND Instruments International.
Continuous product development may make it necessary to change these details without notice.
RT8B Thermometer User Guide, Issue 1, 14 September 2022
RT8B
LOW TEMPERATURE STANDALONE THERMOMETER
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