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8

Troubleshooting

8.1

Troubleshooting

In the event that the probe appears to function abnormally, this section may
help to find and solve 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 Service Center (see Section 1.3) for assistance. Be sure to have the
model number and serial number of your probe available.

Problem

Solution

Data changes

•

Slight mechanical shock can cause temperature errors
as much as 2mK. If this is observed, first measure and
record the R

tp.

Next anneal the SPRT at 480°C (5680

and 5682) or 661° (5699 only) overnight. Measure the
R

tp

again. The annealing should decrease the R

tp

. Re-

peat the annealing, R

tp

measurement cycle several

times. When the R

tp

is stable, recalibrate the SPRT. If

the R

tp

does not stabilize, contact a Hart Scientific Autho-

rized Service Center.

•

Oxidation of the platinum sensor may occur after pro-
longed use between 200 – 450°C. R

tp

will show an in-

crease. To reduce the effects of oxidation, anneal the
SPRT at 480°C (5680 and 5682) or 661°C (5699 only)
overnight (12 hours). Measure the R

tp

again. Repeat the

annealing, R

tp

measurement cycle several times This an-

nealing process should return R

tp

to within calibration tol-

erances. If the R

tp

is within calibration tolerance, the

SPRT is usable. If the R

tp

is not within calibration toler-

ance, but it is stable, recalibrate the SPRT.

•

Severe mechanical shock can permanently damage the
SPRT. If annealing the SPRT does not resolve the data
change, contact an Authorized Service Center.

Data unstable

•

If the data is unstable at the Triple Point of Water
(TPW), check the connection first. If this action does not
fix the problem contact a Hart Scientific Authorized Ser-
vice Center. The SPRT may be damaged and need re-
pair.

•

If the data is unstable at high temperatures, it may be
due to electrical noise in the system. Reduce the tem-
perature and observe the data. If it is stable, electrical
noise is interfering with the measurements at high tem-
peratures. 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 lead wire (the fifth wire) of the SPRT may help to
reduce electrical noise interference. Be sure the ground
lead wire is connected to an appropriate ground on the
read-out device.

21

8 Troubleshooting

Troubleshooting

1.888.610.7664 

[email protected]

Fluke

-

Direct

.com

Содержание 5680

Страница 1: ...5680 5682 5699 Metal Sheath Standard Platinum Resistance Thermometer User s Guide Rev 5C1301 Hart Scientific 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 2: ...ure 6 3 Specifications and Warranty 9 3 1 Specifications 9 3 2 Construction 9 3 3 Electrical Circuit 9 3 4 Warranty 10 4 Installation 11 4 1 Environmental Issues 11 4 2 Mounting 11 4 3 Lead Wire Identification 11 5 SPRT Care and Handling Guidelines 13 5 1 SPRT Care 13 5 2 SPRT Handling Guidelines 13 6 Operation 15 6 1 General 15 6 2 Comparison Calibration of Other Instruments 15 6 3 Immersion Requ...

Страница 3: ...6 5 Measuring Current 16 6 6 Cooling Rates at High Temperatures 16 7 Accessories 19 7 1 Case 19 8 Troubleshooting 21 8 1 Troubleshooting 21 ii 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 4: ...le 1 International Electrical Symbols 1 Figure 1 5680 5682 5699 Metal Sheath Platinum Resistance Thermometer 5 Table 2 Specifications 9 Figure 2 Circuit Schematic 12 iii 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 5: ...anual 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 1 Before You Start Symbols Used Table 1 International Electrical Symbols 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 6: ... may pose hazards to the user CAUTION identifies conditions and actions that may damage the in strument being 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 DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in t...

Страница 7: ...case Incorrect handling can damage the SPRT and void the warranty Keep the shipping container in case it is necessary to ship the SPRT In correct packaging of the SPRT for shipment can cause irreparable dam age 1 Before You Start Authorized Service Centers 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 8: ... 5699 has a resistance of 25 5Ω at the triple point of water These metal sheath SPRTs are hand constructed at Hart Scientific by experts with years of SPRT manufacturing experience Each SPRT is carefully an nealed at the appropriate temperatures and precisely tested for stability The sensing element is fabricated using high purity platinum wire wound in a strain free design on a special frame The ...

Страница 9: ...lity Assurance requirements the SPRT 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 cali bration tolerances a full recalibration should be scheduled 2 4 Recalibration The recalibration of the SPRTs should be scheduled ...

Страница 10: ...ragile is recommended Whether the thermometer is returned for repair or warranty please include a letter containing the following information Description of the faulty operation and circumstances of failure Complete shipping instructions for the return of the thermometer to the customer 7 2 Introduction Return Procedure 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 11: ...19 0 005 0 127 mm 0 005 Length 482 mm 19 Insulation Resistance 100MΩ at 480 C 1000MΩ at 20 C 100MΩ at 661 C 1000MΩ at 20 C 3 2 Construction The Model 5680 5682 SPRTs cover the range from 200 C to 480 C and the Model 5699 SPRT covers the range from 200 C to 661 C The sensor ele ments are crafted using high purity platinum wire wound in a strain free design on a specially designed support 3 3 Electr...

Страница 12: ...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 To exercise this warranty the purchaser must forward the product after calling or writing an Authorized Service ...

Страница 13: ...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 thermal expansion of the thermometer sheath when determining block well tolerances 4 3 Lead Wire Identification The Model 5680 5682 5699 SPRTs are equipped with a five wire cable Four lead wir...

Страница 14: ...which should be connected to the ground See Figure 2 5680 5682 5689 SPRT User s Guide 12 BLACK RED White Yellow Red Black Rx GREEN connected to Inconel sheath to ground Figure 2 Circuit Schematic 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 15: ...RT to comfortably slip in and out without excess movement For best results immerse the thermometer as deep as possible to avoid stem ef fect the temperature error caused by the conduction of heat away from the sensor Do not submerge the handles 3 DO allow sufficient time for the thermometer to stabilize before making measurements allowing for the best accuracy 4 DO use the correct drive current wi...

Страница 16: ...DON T take the SPRT out directly when it has been at a temperature higher than 500 C Allow the SPRT to cool to a temperature less than 500 C before removing it to room temperature See Section 6 6 for more information 5680 5682 5689 SPRT User s Guide 14 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 17: ... element to the housing How ever the effect of the shunt resistance is insignificant Full immersion is recom mended in a furnace or freeze point cell The immersion depth for primary standards is dependent on several factors in cluding accuracy requirements and type of liquid Therefore we recommend a 203 mm 8 inch minimum immersion depth The exact immersion depth required can be determined by perfo...

Страница 18: ...682 5699 measurements are made at 1 mA and 1 4 mA These measurements are then extrapolated to zero current This can be done graphically by plotting i vs R and extrapolating to zero power or by using the following equation R R i R R i i 0 1 1 2 2 1 2 2 1 2 where R0 Zero current resistance R1 Resistance measured at current i1 R2 Resistance measured at current i2 Equation 2 Calculation of R0 6 6 Cool...

Страница 19: ...ly removed from an instrument at 500 C or less and cooled to room temperature without concern for the cooling rate 17 6 Operation Cooling Rates at High Temperatures 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 20: ...ped in a protective case The SPRT should be stored in this case when not in use The SPRT should be shipped in this case when returning see Section 2 5 Return Procedure 19 7 Accessories Case 1 888 610 7664 info Fluke Direct com Fluke Direct com ...

Страница 21: ... C 5680 and 5682 or 661 C 5699 only overnight 12 hours Measure the Rtp again Repeat the annealing Rtp measurement cycle several times This an nealing process should return Rtp to within calibration tol erances If the Rtp is within calibration tolerance the SPRT is usable If the Rtp is not within calibration toler ance but it is stable recalibrate the SPRT Severe mechanical shock can permanently da...

Страница 22: ...here may be a short in the sensor Contact an Authorized Service Center If the resistance of the SPRT is only a few ohms there may be a short in the four lead wires Contact an Autho rized Service Center If the SPRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm range Contact an Au thorized Service Center 5680 5682 5689 SPRT User s Guide 22 1 888 610 7664 info Fluke Dire...

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