Fluke Thermometer 5623A User Manual

Hart Scientific  
5623A  
Platinum Resistance Thermometer  
User’s Guide  
Rev. 5A1101  
 
Table of Contents  
i
 
1 Before You Start  
1
Before You Start  
1.1  
Symbols Used  
Table 1 lists the International Electrical Symbols. Some or all of these symbols  
may be used on the instrument or in this manual.  
Table 1 International Electrical Symbols  
Symbol  
Description  
AC (Alternating Current)  
AC-DC  
Battery  
CE Complies with European Union Directives  
DC  
Double Insulated  
Electric Shock  
Fuse  
PE Ground  
Hot Surface (Burn Hazard)  
Read the User’s Manual (Important Information)  
Off  
On  
5623A  
1
 
 
1 Before You Start  
Symbol  
Description  
Canadian Standards Association  
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 refers to the  
level of Impulse Withstand Voltage protection provided. Equipment of OVERVOLTAGE CATE-  
GORY II is energy-consuming equipment to be supplied from the fixed installation. Exam-  
ples include household, office, and laboratory appliances.  
CAT  
C-TIC Australian EMC Mark  
1.2  
Safety Information  
Use this instrument only as specified in this manual. Otherwise, the protection  
provided by the instrument may be impaired.  
The following definitions apply to the terms “Warning” and “Caution”.  
“Warning” identifies conditions and actions that may pose hazards to the user.  
“Caution” identifies conditions and actions that may damage the instrument be-  
ing used.  
1.2.1  
Warnings  
To avoid personal injury, follow these guidelines.  
DO NOT use this instrument to measure the temperature of any hazard-  
ous live component.  
Use of this instrument at high temperatures for extended periods of time  
can cause the handle to become hot.  
Follow all safety guidelines listed in the user’s manual.  
Calibration Equipment should only be used by Trained Personnel.  
1.2.2  
Cautions  
To avoid possible damage to the instrument, follow these guidelines.  
DO NOT drop or bang the probe in any way. This will cause damage to  
the probe internally and affect its calibration.  
Read Section 5 entitled “PRT Care and Handling Guidelines” before re-  
moving the PRT from the shipping box. Incorrect handling can damage  
the PRT and void the warranty.  
2
Hart Scientific  
 
 
1 Before You Start  
Keep the shipping container in case it is necessary to ship the PRT. Incor-  
rect packaging of the PRT for shipment can cause irreparable damage.  
1.3  
Hart Scientific Authorized Service Centers  
Please contact one of the following authorized Service Centers to coordinate  
service on your Hart product:  
Hart Scientific, Inc.  
799 E. Utah Valley Drive  
American Fork, UT 84003-9775  
USA  
Phone: +1.801.763.1600  
Telefax: +1.801.763.1010  
Fluke Nederland B.V.  
Customer Support Services  
Science Park Eindhoven 5108  
5692 EC Son  
NETHERLANDS  
Phone: +31-402-675300  
Telefax: +31-402-675321  
Fluke Int'l Corporation  
Service Center - Instrimpex  
Room 2301 Sciteck Tower  
22 Jianguomenwai Dajie  
Chao Yang District  
Beijing 100004, PRC  
CHINA  
Phone: +86-10-6-512-3436  
Telefax: +86-10-6-512-3437  
5623A  
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1 Before You Start  
Fluke South East Asia Pte Ltd.  
Fluke ASEAN Regional Office  
Service Center  
83 Clemenceau Avenue  
#15-15/06 Ue Square  
239920  
SINGAPORE  
Phone: +65-737-2922  
Telefax: +65-737-5155  
When contacting these Service Centers for support, please have the following  
information available:  
Model Number  
Serial Number  
Complete description of the problem  
4
Hart Scientific  
 
2 Introduction  
2
Introduction  
2.1  
General  
The Platinum Resistance Thermometers (PRT) model 5623A is designed to be  
a secondary standard interpolating instrument converting temperature to resis-  
tance. The 5623A assembly design allows for exposure to very cold tempera-  
ture (–200°C) and is an ideal reference for verification, monitoring or  
calibrating control sensors in located in freezers or incubators. The 5623A may  
also be used as a temperature standard for calibration of industrial sensors. The  
PRT is used with a readout device to detect temperature changes or actual tem-  
perature. The 5623A covers the range from –200°C to 156°C. Standard length  
is 6 inches. Custom lengths are available on request.  
2.2  
Recalibration  
The recalibration of the 5623A PRT should be scheduled according to the  
user’s company Quality Assurance requirements. Normally, a PRT is  
recalibrated annually. Unless the PRT is used only over a limited range, calibra-  
tion over the full range of the PRT (–200°C to 156°C) is recommended. For in-  
formation on recalibrating your 5623A, contact an Authorized Hart Scientific  
Service Center for an RMA number and current pricing (see Section 1.3).  
Depending on the user’s Quality Assurance requirements, the PRT drift should  
be checked periodically at the Triple Point of Water (TPW). Section 7,Trouble-  
shooting, provides information on drift with respect to mechanical shock and  
oxidation.  
5623A  
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3 Specifications and Warranty  
3
Specifications and Warranty  
3.1  
Specifications  
See Table 2.  
Table 2 Specifications  
Temperature Range  
–200°C to 156°C  
–200°C to 156°C  
0.05°C (full range)  
Entire Assembly Range  
Accuracy (Includes calibration  
uncertainty and short-term  
stability)  
Long-term Drift (°C)  
Hysteresis (°C)  
Temperature Coefficient  
Size (O.D.)  
< 0.01 at 0°C per year, when used periodically at 200  
<0.01  
0.003925 ohms/ohms/°C  
0.25" (6.35 mm)  
Sheath Length  
Sheath Material  
Cable length  
6" (152.4 mm)  
Inconel 600  
20 ft. (609.6 cm)  
Lead Wires  
22 AWG/ Teflon insulated cable, 4-wire  
3.2  
Warranty  
Hart Scientific, Inc. (Hart) warrants this product to be free from defects in ma-  
terial and workmanship under normal use and service for a period as stated in  
our current product catalog from the date of shipment. This warranty extends  
only to the original purchaser and shall not apply to any product which, in  
Hart’s sole opinion, has been subject to misuse, alteration, abuse or abnormal  
conditions of operation or handling.  
Software is warranted to operate in accordance with its programmed instruc-  
tions on appropriate Hart products. It is not warranted to be error free.  
Hart’s obligation under this warranty is limited to repair or replacement of a  
product which is returned to Hart within the warranty period and is determined,  
upon examination by Hart, to be defective. If Hart determines that the defect or  
malfunction has been caused by misuse, alteration, abuse or abnormal condi-  
tions or operation or handling, Hart will repair the product and bill the pur-  
chaser for the reasonable cost of repair.  
5623A  
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3 Specifications and Warranty  
To exercise this warranty, the purchaser must forward the product after calling  
or writing an Authorized Hart Scientific Service Center (see Section 1.3 on  
page 3) for authorization. The Service Center assumes NO risk for in-transit  
damage.  
THE FOREGOING WARRANTY IS PURCHASER’S SOLE AND EXCLU-  
SIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EX-  
PRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY  
IMPLIED WARRANTY OR MERCHANTABILITY, OR FITNESS FOR ANY  
PARTICULAR PURPOSE OR USE. HART SHALL NOT BE LIABLE FOR  
ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAM-  
AGES OR LOSS WHETHER IN CONTRACT, TORT, OR OTHERWISE.  
8
Hart Scientific  
 
4 Installation  
4
Installation  
4.1  
Lead Wire Identification  
The 5623A PRT is equipped with a four-wire cable (see Figure 1). Four lead  
wires are used to cancel lead wire resistance. For best results, the readout de-  
vice should be equipped to handle four-terminal resistors.  
White  
Red  
Red  
White  
Figure 1 PRT Schematic  
The lead wires are two different colors. Lead wire pairs attached to each end of  
the sensor are identified by red and white insulation.  
5623A  
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5 PRT Care and Handling Guidelines  
5
PRT Care and Handling Guidelines  
5.1  
PRT Care  
CAUTION: READ THIS SECTION BEFORE REMOVING THE PRT  
FROM THE SHIPPING BOX OR CASE  
Care must be taken in handling the PRT to maintain calibration accuracy. Care  
should still be used when handling the PRT even though the Inconel sheath is  
durable and provides good protection for the sensor. Correct handling of the  
PRT will prolong the life expectancy. When not in use, the PRT should be  
stored in an optional protective case that can be purchased from Hart Scientific.  
The handle is designed to be immersed.  
5.2  
PRT Handling Guidelines  
DO keep the thermometer as clean as possible.  
DO immerse the thermometer in the appropriate liquid for the tempera-  
ture range. If a dry block is used, the well diameter should allow the PRT  
to comfortably slip in and out without excess movement. For best results,  
immerse the thermometer as deep as possible to avoid “stem effect” (the  
temperature error caused by the conduction of heat away from the sen-  
sor).  
DO allow sufficient time for the thermometer to stabilize before making  
measurements. This allows for the best accuracy.  
DO use the correct drive current with the thermometer to prevent error in  
temperature or resistance. Hart Scientific recommends 1mA.  
DO use the protective shipping box provided or other protection when the  
thermometer is not in use.  
DO NOT subject the thermometer to any physical shock or vibration.  
DO NOT use pliers or other devices to squeeze the sheath. This action  
can permanently damage the PRT.  
DO NOT subject the thermometer to temperatures above the highest  
specified operating temperature.  
DO NOT expose the thermometer’s handle or cables to extreme tempera-  
tures. The temperature limits of the handle are: –200°C to 156°C  
5623A  
11  
 
 
5 PRT Care and Handling Guidelines  
DO NOT screw a clamp down so tight that it dents the sheath. This can  
permanently damage the PRT.  
12  
Hart Scientific  
 
6 Operation  
6
Operation  
6.1  
General  
For best results, be familiar with the operation of the heat source and the  
read-out instrument. Be sure to follow the manufacturer’s instructions for the  
read-out instrument and the heat source.  
6.2  
Immersion Requirements  
Stem effect can cause measurement errors for any thermometer not immersed  
in the fluid at least 114 mm (4.5 inches). This error is due to heat lost or gained  
by the sensing element through the thermometer stem. In addition, heat losses  
occur due to radiation losses from the sensing element to the housing.  
The immersion depth for standards is dependent on several factors including  
accuracy requirements and type of liquid. Therefore, we recommend a 114 mm  
(4.5 inches) minimum immersion depth. However, remember the handle limita-  
tions. The handle is designed to be immersed. The temperature limits of the  
handle are –200°C to 156°C. Temperatures outside these limits can damage the  
handle and the probe. Convection of heat from the heat source must be kept  
within the handle limits.  
The exact immersion depth required can be determined by performing a gradi-  
ent test taking measurements approximately every 1.27 cm (.5 inches) until  
there is a significant difference in readings. Allow the thermometer to stabilize  
at each new depth. Plot the results to see the stem effect.  
6.3  
Thermal EMF  
Two factors contribute to thermal EMF, chemical consistency and physical con-  
sistency. Variations in chemical structure due to impurities can contribute to  
thermal EMF. Also discrepancies in crystal structure can contribute to thermal  
EMF. These factors are minimized by annealing the full length of wire before  
construction of the PRT.  
Likewise, connection to extension lead wires and readout instruments can be a  
source of thermal EMF. The thermal EMF is caused by a difference in tempera-  
ture between two connections. If the two connections are the same temperature,  
there will be little or no thermal EMF effects. However, if there is a substantial  
temperature difference between connections, the thermal EMF effects will be  
significant. Therefore, cover or insulate any exposed bridge or galvanometer  
terminals to lessen the source of error. The effects of thermal EMF can be can-  
celed by using an AC bridge or a DC bridge with reversible current.  
5623A  
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7 Troubleshooting  
7
Troubleshooting  
7.1  
Troubleshooting  
In the event that the probe appears to function abnormally, this section may be  
of use in solving the problem. Several possible problem conditions are de-  
scribed along with likely causes and solutions. If a problem arises, please read  
this section carefully and attempt to understand and solve the problem. If the  
probe seems faulty or the problem cannot otherwise be solved, contact an Au-  
thorized Hart Scientific Service Center (see Section 1.3) for assistance. Be sure  
to have the model number and serial number of your probe available.  
Problem  
Causes and Solutions  
Data changes greater than 0.1°C  
are observed  
Mechanical shock can cause temperature errors as great as 0.5°C. If this  
is observed, first measure and record the Rtp.  
Data changes less than 0.1°C  
Data unstable  
Slight mechanical shock can cause temperature errors less than 0.1°C.  
If the data is unstable at the Triple Point of Water (TPW), check the con-  
nector. If the connector is correct, contact an Authorized Hart Scientific  
Service Center (see Section 1.3). The PRT may be damaged.  
If the data is unstable at high temperatures, it may be due to electrical  
noise in the system. Reduce the temperature and observe the data. If it  
is stable, electrical noise is interfering with the measurements at high  
temperatures. Check the grounding of the readout device and the heat  
source. A faulty ground on either device could interfere with high tem-  
perature measurements. A ground wire attached to the metal sheath of  
the PRT may help to reduce electrical noise interference.  
Temperature readout different than  
expected, e.g. the heat source is set  
at 150°C, the PRT measures 125°C.  
Measure the PRT resistance at TPW.  
If the resistance of the PRT is less than the rated resistance, e.g. 70 Ω,  
there may be a short in the sensor. Contact an Authorized Hart Scientific  
Service Center (see Section 1.3).  
If the resistance of the PRT is only a few ohms, there may be a short in  
the four lead-wires. Contact an Authorized Hart Scientific Service Center  
(see Section 1.3).  
If the PRT is open, the resistance will be “Out of Limits” or in the  
kilo-ohm or mega-ohm range. Contact an Authorized Hart Scientific Ser-  
vice Center (see Section 1.3).  
5623A  
15  
 
 

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