Fluke 1551A Ex User manual
November 2010, Rev. 1, 10/19
© 2010 - 2019 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
1551A Ex/1552A Ex
Stik Thermometer
Users Manual
LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance
with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
ООО «Флюк СИАЙЭС»
125167, г. Москва,
Ленинградский проспект дом 37,
корпус 9, подъезд 4, 1 этаж
11/99
To register your product online, visit register.fluke.com
i
Table of Contents
Title Page
Introduction ........................................................................................................ 1
Features .............................................................................................................. 1
How to Contact Fluke ........................................................................................ 2
Safety Information ............................................................................................. 3
Ex Safety Information ................................................................................... 3
Operation ........................................................................................................... 3
Immersion Depth and Usage ......................................................................... 3
Time Constant ............................................................................................... 5
Display and Controls ..................................................................................... 6
Primary Display ........................................................................................ 7
Stability Display ........................................................................................ 7
Setup and Configuration ................................................................................ 7
Temperature Unit Selection ...................................................................... 7
Stability Limit ........................................................................................... 7
Auto-Off Selection .................................................................................... 8
Battery Life ............................................................................................... 8
Operating Temperature ............................................................................. 8
Damping .................................................................................................... 8
Sampling Rate ........................................................................................... 8
Display Resolution .................................................................................... 9
RS-232 Communication ............................................................................ 9
Ohms Display ............................................................................................ 9
Start or Stop Data Logging ....................................................................... 9
Display Free Log Memory ............................................................................ 9
Logging Interval ........................................................................................ 10
Send Logged Data ..................................................................................... 10
Erase Logged Data .................................................................................... 10
Maintenance ....................................................................................................... 10
Clean the Product .......................................................................................... 10
Battery Replacement ..................................................................................... 10
Battery Life .................................................................................................... 12
Calibration ..................................................................................................... 12
SCPI Commands ................................................................................................ 12
Remote Communications ................................................................................... 12
RS-232 Port Operation .................................................................................. 12
Command Summary ...................................................................................... 12
RS-232 Interface ................................................................................................ 15
Specifications ..................................................................................................... 16
1551A Ex/1552A Ex
Users Manual
ii
1
Introduction
The Stik Thermometer (the Product or the Probe) is a precision digital thermometer that
can be used as an alternative to mercury liquid-in-glass (LIG) thermometers. It can also
be used as a reference standard for other types of digital or analog thermometers. Because
of its intrinsically safe certification, it can be used in many of the same hazardous
locations as analog thermometers.
When you receive the Product, check that it is intact. The batteries are factory installed.
Keep the shipping materials until you have made sure that there is no concealed damage.
Features
This section tells you about the features of the Product.
• The 1551A Ex Probe contains a fast-responding thin-film sensor that makes accurate
measurements quickly and with minimal immersion depth. The Probe is available in
three versions:
• 4.8 mm x 229 mm (3/16 in. x 9 in.)
• 6.35 mm x 305 mm (1/4 in. x 12 in.)
• 6.35 mm x 508 mm (1/4 in. x 20 in.)
• The 1552A Ex Probe contains a stable, wire-wound platinum sensor with a 6.35 mm
x 305 mm (1/4 in. x 12 in.) length sheath.
A rotatable probe mount lets the display module be turned horizontally or vertically.
A unique feature of the Product is the trend indication arrows. You can configure the
arrows to show when the measurements are adequately stable to record a result.
The auto-off feature gives extended battery life of 300 hours maximum. The typical user
may only have to change the batteries a few times a year.
1551A/1552A Ex
Users Manual
2
Added features let you tailor the Product for specific applications.
These features include:
• ±0.05 °C accuracy over full range
• Intrinsically safe
• Display temperature in °C or °F
• Temperature trend indicator
• User-selectable resolution (0.1, 0.01, 0.001)
• Large LCD with backlight
• 300 hour battery life
• Percent battery life and low-battery indicator
• NVLAP accredited calibration (NIST traceable)
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
• Technical Support USA: 1-800-44-FLUKE (1-800-443-5853)
• Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853)
• Canada: 1-800-36-FLUKE (1-800-363-5853)
• Europe: +31 402-675-200
• Japan: +81-3-6714-3114
• Singapore: +65-6799-5566
• China: +86-400-921-0835
• Brazil: +55-11-3530-8901
• Anywhere in the world: +1-425-446-5500
Or, visit Fluke's website at www.fluke.com.
To register your product, visit http://register.fluke.com.
To see, print, or download the latest manual supplement, visit
http://us.fluke.com/usen/support/manuals.
Stik Thermometer
Safety Information
3
Safety Information
A Warning identifies conditions and actions that pose hazard(s) to the user. A Caution
identifies conditions and procedures that could cause Product damage, equipment under
test damage, or permanent loss of data.
General Safety Information is in the printed Safety Information document that ships with
the Product and at www.Fluke.com. More specific safety information is listed where
applicable.
If the Product overheats or is exposed to sudden physical shock, examine it for damage
that can cause a safety risk. If possible, compare the displayed temperature to a known
reference before Product use. If not sure, send the Product to Fluke Corporation. Refer to
“How to Contact Fluke”.
Substitution of components will impair suitability for hazardous locations.
Ex Safety Information
This manual contains data and safety regulations that must be followed for safe, reliable
use of the Product in hazardous areas under the detailed conditions. If you do not follow
these instructions, personal injury or Product damage can occur. Violation of applicable
legislation can also occur. Read the full manual before you use the Product. To make sure
of safe Product operation, fully follow all instructions and warnings in the manual. If you
are not sure (due to translation and/or printing errors), refer to the English manual.
An “Ex-hazardous area,” as used in this manual, refers to an area made hazardous by the
possible presence of flammable or explosive vapors. These areas are also referred to as
“hazardous locations.”
gjo006.bmp
Operation
Immersion Depth and Usage
WCaution
To prevent possible damage to the Product or to equipment
under test, do not immerse the Probe beyond the maximum
immersion depth. This may damage its internal electronics.
The Product must be adequately immersed in the medium to make an accurate
temperature measurement.
Allow enough time for the Probe to stabilize before recording measurements. Use the
Stability Display to determine when the Probe has stabilized.
1551A/1552A Ex
Users Manual
4
Probe sensor length is shown in Figure 1.
gjo004.bmp
Sheath Length:
1551A-9: 229 mm (9 in)
1551A-20: 508 mm (20 in)
1551A-12/1552A-12: 305 mm (12 in)
Sensor Length:
1551A: ≤10 mm (0.39 in)
1552A: ≤30 mm (1.18 in)
Sheath Diameter:
1551A-9: 4.8 mm (3/16 in)
1551A-12/1551A-20/1552A: 6.35 mm (1/4 in)
Figure 1. Probe Measurements
• The minimum required immersion depth depends on the type of medium (wet or
dry) as shown in Table 1. These figures should result in immersion errors of
<0.005 °C in most cases. Actual results depend on the type and form of the
surrounding materials.
Table 1. Minimum Immersion Depth
Medium Minimum Immersion Depth
Wet (liquid bath, thermowell with thermal
compound) 70 mm (2.8 in.)
Dry (dry-well, thermowell without thermal
compound) 120 mm (4.8 in.)
• The maximum immersion depth for the 1551A Ex is 50 mm (2 in) less than the total
length. Make sure the last 50 mm of Probe, nearest to the internal electronics of the
device, are not put into the heat source.
• The maximum immersion depth for the 1552A Ex is 75 mm (3 in) less than the total
length. Make sure the last 75 mm of the Probe, nearest to the internal electronics of
the device, are not put into the heat source.
See Figure 2.
Stik Thermometer
Operation
5
gjo002.bmp
1552A Ex: Maximum immersion: 75 mm less than total probe length.
1551A Ex: Maximum immersion: 50 mm less than total probe length.
Figure 2. Maximum Immersion Depth
Time Constant
The different probe sizes of the Thermometer exhibit different settling time constants.
This parameter describes the time it takes for the Thermometer to change 63 % toward its
final temperature (see ASTM E644). The time constant depends on the diameter of the
metal sheath of the Thermometer. Typical time constants are given in Table 2.
Table 2. Time Constant
Sheath Diameter Time Constant
4.8 mm (3/16 in.) 14 seconds
6.35 mm (1/4 in.) 21 seconds
1551A/1552A Ex
Users Manual
6
Display and Controls
The Display and Controls are explained below and in the Setup and Configuration
section. See Figure 3.
gjo001.bmp
Number Item Description
D Push to power the Product on and off. Hold the button down at power-up to
check the display to see that all display segments are shown.
A Push to toggle the main display value between min, max, and trend modes.
B Push to change the various set-up parameters of the Product.
C Push to enter data in set-up modes. When the Product is displaying
temperature, push C to activate the backlight.
Primary
Display Shows the temperature values in °C or °F. Also used in set-up mode.
Icon area Used in regular and setup modes.
Stability
Display Shows the trend and stability of data.
Arrow
Buttons Secondary functions of Aand B. Enter data in the setup modes.
M Backlight symbol.
E Flashes when the batteries need to be changed.
Figure 3. Display and Controls
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