Fluke Thermometer 5626 5628 User Manual

Hart Scientific  
5626/5628  
Platinum Resistance Thermometer  
User’s Guide  
Rev. 532801  
 
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 sym-  
bols 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  
1
 
 
5626/5628  
User’s Guide  
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 CATEGORY II is energy-con-  
suming equipment to be supplied from the fixed installation. Exam-  
ples include household, office, and laboratory appliances.  
CAT  
C-TIC Australian EMC Mark  
The European Waste Electrical and Electronic Equipment (WEEE) Di-  
rective (2002/96/EC) mark.  
1.2  
Safety Information  
Use this instrument only as specified in this manual. Otherwise, the protec-  
tion 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  
being used.  
1.2.1  
Warnings  
To avoid personal injury, follow these guidelines.  
DO NOT use this instrument to measure the temperature of any haz-  
ardous live component.  
DO NOT use this unit for any application other than calibration work.  
DO NOT use this unit in environments other than those listed in the  
user’s manual.  
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 remove the label from the handle. This cautions the user con-  
cerning the delicate nature of the instrument.  
2
 
 
1
Before You Start  
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 or case. Incorrect handling can  
damage the PRT and void the warranty.  
Keep the shipping container in case it is necessary to ship the PRT. In-  
correct packaging of the PRT for shipment can cause irreparable dam-  
age.  
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  
3
 
 
5626/5628  
User’s Guide  
Phone: +86-10-6-512-3436  
Telefax: +86-10-6-512-3437  
Fluke South East Asia Pte Ltd.  
Fluke ASEAN Regional Office  
Service Center  
60 Alexandra Terrace #03-16  
The Comtech (Lobby D)  
118502  
SINGAPORE  
Phone: +65 6799-5588  
Telefax: +65 6799-5588  
When contacting these Service Centers for support, please have the follow-  
ing information available:  
Model Number  
Serial Number  
Complete description of the problem  
4
 
2
Introduction  
2
Introduction  
2.1  
General  
The Hart Platinum Resistance Thermometers (PRT) models 5626 and 5628,  
are designed to be the best secondary standard interpolating instrument  
converting temperature to resistance. The PRTs are used with a readout de-  
vice to detect temperature changes or actual temperature. The PRTs cover  
the International Temperature Scale of 1990 (ITS-90) range from –200°C to  
661°C. Two standard resistance values are available. The 5626 is 100Ω and  
the 5628 is 25.5Ω. Standard lengths are 12, 15, and 20 inches. Custom  
lengths are available on request.  
The two PRTs are hand constructed at Hart Scientific by experts with years  
of PRT manufacturing experience. Each PRT is carefully annealed at the ap-  
propriate temperatures and precisely tested for stability. The sensing ele-  
ment is fabricated using high purity platinum wire wound in a strain free  
design on a specially designed support. The 1/4 inch O.D. Inconel 600  
sheaths are sealed with a specially mixed gas and fit with a terminal box  
handle and strain relieved connection to the four-wire cable. Gold plated  
spade lugs terminate the wires.  
2.2  
Application  
Hart 5626 and 5628 thermometers are classified as secondary standards. A  
secondary standard is defined in terms of transfer of the ITS-90 from a  
standards laboratory to a customer’s laboratory. Secondary standards are  
Figure 1 Hart Model 5626 and 5628 Platinum Resistance Thermometers  
5
 
 
5626/5628  
User’s Guide  
calibrated using a primary standard that has been calibrated in a primary  
calibration laboratory using known intrinsic values.  
2.3  
Calibration  
In order for any instrument to be used as a standard it must be calibrated.  
The PRTs are calibrated in Hart Scientific's calibration laboratory and pro-  
vided with a NIST traceable “Report of Calibration”.  
At the time of purchase, the 5626 and 5628 are calibrated over their entire  
range (–196°C to 660°C) at specified ITS-90 fixed points. Generally, a sec-  
ondary PRT is calibrated by comparison method. All PRTs calibrated by Hart  
Scientific are calibrated using standard calibration techniques.  
2.4  
Recalibration  
The recalibration of the 5626/5628 Secondary PRT should be scheduled ac-  
cording to the user’s company Quality Assurance requirements. Normally, a  
PRT is recalibrated annually. Unless the PRT is used only over a limited  
range, calibration over the full range of the PRT (–196°C to 661°C) is recom-  
mended. For information on recalibrating your 5626 or 5628, contact Hart  
Scientific’s Customer Service department for an RMA number and current  
pricing (see Section , Before You Start).  
Depending on the user’s Quality Assurance requirements, the PRT drift  
should be checked periodically at the Triple Point of Water (TPW). Section  
8,Troubleshooting, provides information on drift with respect to mechanical  
shock and oxidation. If the Rtp cannot be restored after annealing to within  
calibration tolerances, a full recalibration should be scheduled.  
6
 
 
3
Specifications and Warranty  
3
Specifications and Warranty  
3.1  
Specifications  
See Table 2 and Figure 2.  
Table 2 Specifications  
5626  
5628  
Temperature Range  
Rtp  
–200°C to 661°C  
100Ω 1Ω at 0.01°C  
25.5Ω 0.5Ω at 0.01°C  
Resistance RatioW(Ga)  
W(302.9146K) 1.11807  
α ≥ 0.003925  
Calibration Uncertainty  
(k=2)  
0.006°C at –200°C  
0.004°C at 0°C  
0.009°C at 420°C  
0.014°C at 661°C  
Short-Term Stability  
0.003°C  
0.002°C  
Long-Term Drift (Rtp)  
0.03°C with 500 hours at  
0.02°C with 500 hours at  
661°C  
661°C  
Sheath  
Inconel™ 600  
Handle Temperature  
Range  
0°C to 80°C  
Lead Wires  
Termination  
Size  
4-wire Super-Flex PVC, 22 AWG  
Gold-plated spade lugs  
304.8 mm x 6.35 mm dia. (12" L x 0.25")  
381 mm x 6.35 mm dia.(15" L x 0.25”)  
508 mm x 6.35 mm dia. (20" L x 0.25")  
562X-12 12"  
562X-15 15"  
562X-20 20”  
65 mm  
(2.5")  
5626  
SN:0021  
6.35 mm  
(.25")  
Inconel Sheath  
Strain Relief  
Terminal Box  
Lead Wire  
Gold-plated Terminals  
2 meters  
(6')  
152 mm  
(6")  
Figure 2 Standard Dimensions  
7
 
 
5626/5628  
User’s Guide  
3.2  
3.3  
3.4  
Construction  
The Model 5626 and 5628 PRTs cover the range from –200°C to 661°C. The  
sensor elements are crafted using high purity platinum wire wound in a  
strain free design on a specially designed support.  
Electrical Circuit  
The PRTs are provided with a terminal box handle. The two meter cable has  
four Super-Flex wires enclosed in a PVC jacket with a stainless steel spring  
strain relief. Gold plated spade lugs terminate the wires.  
Warranty  
Hart Scientific, Inc. (Hart) warrants this product to be free from defects in  
material and workmanship under normal use and service for a period as  
stated in our current product catalog from the date of shipment. This war-  
ranty 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 in-  
structions 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 deter-  
mined, upon examination by Hart, to be defective. If Hart determines that  
the defect or malfunction has been caused by misuse, alteration, abuse or  
abnormal conditions or operation or handling, Hart will repair the product  
and bill the purchaser for the reasonable cost of repair.  
To exercise this warranty, the purchaser must forward the product after call-  
ing 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 EXCLUSIVE REM-  
EDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,  
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OR MERCHANT-  
ABILITY, OR FITNESS FOR ANY PARTICULAR PURPOSE OR USE. HART SHALL  
NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSE-  
QUENTIAL DAMAGES OR LOSS WHETHER IN CONTRACT, TORT, OR  
OTHERWISE.  
8
 
 
4
Installation  
4
Installation  
4.1  
Environmental Issues  
Ideally, temperature calibration equipment should be used in a calibration  
laboratory or other facility specifically designed for this purpose. Environ-  
mental requirements include:  
Stable temperature and relative humidity <80%  
Clean, draft-free area  
Low noise level: low radio frequency, magnetic or electrical interfer-  
ence  
Low vibration levels  
4.2  
Mounting  
Most often temperature standards, primary and secondary, are used to cali-  
brate other temperature-sensitive equipment. The PRT must be mounted  
carefully to avoid any damage to the sheath or sensor. If the fluid bath used  
does not have a lid designed for PRT insertion, clamps should be used to  
ensure the handle and cable are not immersed. Do not screw the clamps  
too tight. Over tightening will damage the sheath. If metal comparison  
blocks are used in the bath, maintain a close fit between the thermometer  
sheath and the well in the comparison block. However, allow for the ther-  
mal expansion of the thermometer sheath when determining block well  
tolerances.  
4.3  
Lead Wire Identification  
The 5626 and 5628 PRTs are equipped with a four-wire cable. The same  
circuit schematic applies to both PRTs (see Figure 3). Four lead wires are  
used to cancel lead wire resistance. For best results, the readout device  
should be equipped to handle four-terminal resistors.  
RED  
(Heat Shrink)  
BLACK  
(Heat Shrink)  
Figure 3 PRT Schematic  
The lead wires are four different colors. Lead wire pairs attached to each  
end of the sensor are identified by red and black heat shrink tubing.  
9
 
 
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  
The 5626 and 5628 Platinum Resistance Thermometers (PRTs) are delicate  
instruments. Care must be taken in handling the PRTs to maintain calibra-  
tion accuracy. The stress free design of the PRT sensor reduces the effects of  
mechanical shock. In addition, contamination problems of the sensor at high  
temperature have been eliminated. However, 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 the protective  
case provided by Hart.  
Note: The PRT sheath changes color after use at high temperatures.  
The PRT may arrive with a brown tint to the sheath due to calibration  
at high temperatures.  
The handle is not designed to be immersed. The temperature limits of the  
handle are: 0°C to 80°C. Temperatures outside these limits can damage the  
sealed portion of the handle and the connectors.  
5.2  
PRT Handling Guidelines  
DO anneal the thermometer after shipment. Shipping the thermometer  
can cause mechanical shocks that effect the accuracy of the thermome-  
ter. Therefore, if possible, we advise that the thermometer be annealed  
before use. The thermometer should be annealed at 500°C overnight  
or 660°C for four (4) hours.  
DO keep the thermometer as clean as possible. Always remove any  
fluid from the sheath immediately after taking the thermometer from a  
bath.  
DO immerse the thermometer in the appropriate liquid for the temper-  
ature 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 sensor). Do not submerge the handles.  
11  
 
 
5626/5628  
User’s Guide  
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 anneal the thermometer at 600 to 661°C for 12 hours if it becomes  
oxidized.  
DO use the protective shipping box or case provided or other protec-  
tion 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 tem-  
peratures. The temperature limits of the handle are: 0°C to 80°C  
DO NOT submerge the handle or cable in liquids.  
DO NOT screw a clamp down so tight that it dents the sheath. This can  
permanently damage the PRT.  
12  
 
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  
Comparison Calibration of Other  
Instruments  
The uniformity and stability of the heat source and the degree of accuracy  
required determine the number of temperature measurements necessary.  
However, to follow “good” practice procedures, always measure the triple  
point of water (Rtp) after each temperature measurement. The following  
equation provides the most accurate measurement of the ratio:  
Rt  
Rtp  
Wt =  
All PRTs experience errors caused by self-heating of the element.  
Self-heating is a combination of two factors, heat dissipation and heat sink.  
Self-heating error can be reduced to have a negligible effect if the PRT is  
used with the same excitation current and medium in which it was  
calibrated.  
6.3  
Immersion Requirements  
Stem effect can cause measurement errors for any thermometer not im-  
mersed in the fluid at least 152 mm (6 inches). This error is due to heat lost  
or gained by the sensing element through the thermometer stem. In addi-  
tion, heat losses occur due to radiation losses from the sensing element to  
the housing.  
The immersion depth for standards is dependent on several factors includ-  
ing accuracy requirements and type of liquid. Therefore, we recommend a  
152 mm (6 inches) minimum immersion depth. However, remember the  
handle limitations. The handle is not designed to be immersed. The temper-  
ature limits of the handle are 0°C to 80°C. Temperatures outside these limits  
can damage the handle. 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  
gradient 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.  
13  
 
 
5626/5628  
User’s Guide  
6.4  
Thermal EMF  
Two factors contribute to thermal EMF, chemical consistency and physical  
consistency. Variations in chemical structure due to impurities can contrib-  
ute 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  
temperature 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 canceled by using an AC bridge or a DC bridge with re-  
versible current.  
14  
 
 
7
Accessories  
7
Accessories  
7.1  
Case Options  
The 5626/5628 PRT comes in a rigid case appropriate for the length of the  
probe.  
Model Number 2601 PRT Protective Case for 5626-12 and 5628-12  
PRT  
Model Number 2602 PRT Protective Case for 5626-15, 5628-15,  
5626-20, and 5628-20 PRT  
7.2  
PRT Termination  
The 5626/5628 PRT can be terminated in three ways (Figure 4) depending  
on the user’s requirements:  
Gold Plated Spade Lug  
Bare Wire  
5-Pin Din Connector  
Spade Lug  
(standard)  
Bare Wire  
(customer option)  
5-Pin DIN  
(customer option)  
5
4
1
2
3
Figure 4 Probe Termination Examples  
15  
 
 
8
Troubleshooting  
8
Troubleshooting  
8.1  
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  
described 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, con-  
tact an Authorized Hart Scientific Service Center (see Section 1.3) for assis-  
tance. 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. Next anneal the PRT at 660°C overnight. Measure the  
Rtp again. The annealing should decrease the Rtp. If the  
Rtp is stable, recalibrate the PRT.  
Data changes less than  
0.1°C  
Slight mechanical shock can cause temperature errors  
less than 0.1°C. If this is observed, first measure and re-  
cord the Rtp. Next anneal the PRT at 660°C overnight.  
Measure the Rtp again. The annealing should decrease  
the Rtp. Repeat the annealing, Rtp measurement cycle  
several times. When the Rtp is stable, recalibrate the PRT.  
If the Rtp does not stabilize, contact an Authorized Hart  
Scientific Service Center (see Section 1.3).  
Oxidation of the platinum sensor may occur after pro-  
longed use between 200 – 450°C. This oxidation will  
demonstrate itself by an increase in Rtp of less than  
0.1°C. To reduce the effects of oxidation, anneal the PRT  
at 600 – 661°C overnight (12 hr.). Measure the Rtp again.  
Repeat the annealing, Rtp measurement cycle several  
times This annealing process should return Rtp to within  
calibration tolerances. If the Rtp is within calibration tol-  
erance, the PRT is usable. If the Rtp is not within calibra-  
tion tolerance, but it is stable, recalibrate the PRT.  
Data unstable  
If the data is unstable at the Triple Point of Water (TPW),  
check the connector. If the connector is correct, contact  
an Authorized Hart Scientific Service Center (see Section  
If the data is unstable at high temperatures, it may be  
due to electrical noise in the system. Reduce the temper-  
ature and observe the data. If it is stable, electrical noise  
is interfering with the measurements at high tempera-  
tures. Check the grounding of the readout device and  
the heat source. A faulty ground on either device could  
interfere with high temperature measurements. A  
ground wire attached to the metal sheath of the PRT  
may help to reduce electrical noise interference.  
17  
 
 
5626/5628  
User’s Guide  
Problem  
Causes and Solutions  
Temperature readout differ-  
ent than expected, e.g. the  
heat source is set at 300°C,  
the PRT measures 275°C.  
Measure the PRT resistance at TPW.  
If the resistance of the PRT is less than the rated resis-  
tance, e.g. 70 Ω for the 5626, 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 Autho-  
rized 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 Au-  
thorized Hart Scientific Service Center (see Section 1.3).  
18  
 

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