Fluke Calibration 6054 Manual de usuario

6054

Calibration Bath

User Manual

October 2013

All product names are trademarks of their respective companies.

Via Acquanera, 29 22100 Como

tel. 031.526.566 (r.a.) fax 031.507.984

info@calpower.it www.calpower.it

WARNING

To ensure the safety of operating personnel, and to avoid damage to this unit:

DO NOT operate this unit without a properly grounded, properly polarized power cord.

DO NOT connect this unit to a non-grounded, non-polarized outlet.

DO use a ground fault interrupt device.

WARNING

HIGH TEMPERATURES PRESENT

in this equipment.

FIRES and SEVERE BURNS

may result if personnel fail to observe safety precautions.

WARNING

HIGH VOLTAGE

is used in the operation of this equipment.

SEVERE INJURY or DEATH

may result if personnel fail to observe safety precautions.

Before working inside the equipment, turn power off and disconnect power cord.

WARNING

Fluids used in this bath may produce

NOXIOUS OR TOXIC FUMES

under certain circumstances.

Consult the fluid manufacturer’s MSDS (Material Safety Data Sheet).

PROPER VENTILATION AND

SAFETY PRECAUTIONS MUST BE OBSERVED.

TABLE OF CONTENTS

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1 Two Modes of Temperature Control . . . . . . . . . . . . . . . . . . . . . . 11

3.1.1 The Temperature Control Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1.2 The Temperature Drift Mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.1.3 The Fluid system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2 Description Of Features and Controls . . . . . . . . . . . . . . . . . . . . . 12

3.2.1 The Controller Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.2.2 The Power Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.2.3 The Rear Panel: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.1 Receiving and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2 Installation Location Requirements . . . . . . . . . . . . . . . . . . . . . . 16

4.2.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.2 Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.2.3 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

4.3 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3.1 Filling the Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.3.1.1 Filling the Bath With Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.3.2 Draining the Oil from the Bath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6 Controller Operation . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.1 Bath temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2 Reset Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.3 Temperature Set-point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.3.1 Programmable Set-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.3.2 Set-point Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.3.3 Set-point vernier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4 Temperature Scale Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.5 Secondary Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.6 Heater Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.7 Proportional Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

6.8 Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.9 Controller Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.10 Probe Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.10.1 R0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.10.2 ALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.11 Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.11.1 Cutout Reset Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

6.11.2 Stirrer Mode Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.11.3 Stirrer set-point. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.12 Serial Interface Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.12.1 BAUD Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.12.2 Sample Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.12.3 Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.12.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.13 IEEE-488 Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.13.1 IEEE-488 Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.14 Calibration Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.14.1 CTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.14.2 CO and CG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.14.3 H and L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.15 Operation Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7 Digital Communication Interface . . . . . . . . . . . . . . . . . . . 28

7.1 Serial Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.1.1 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.1.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.1.2.1 BAUD rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.1.2.2 Sample Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.1.2.3 Duplex Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.1.2.4 Linefeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.1.3 Serial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.2 IEEE-488 Communication (optional) . . . . . . . . . . . . . . . . . . . . . . 29

7.2.1 Setup and Address Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.2.2 IEEE-488 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

7.3 Interface Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.4 Power Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.5 Heater Settings for Control. . . . . . . . . . . . . . . . . . . . . . . . . . . 32

8 Bath Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

8.1 Calibration Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

8.2 Measuring the Set-point Error . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.3 Computing R0 and ALPHA . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8.4 Calibration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9 Bath Heat Transfer Fluid . . . . . . . . . . . . . . . . . . . . . . . 35

9.1 Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.2 Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.3 Specific heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.4 Thermal Conductivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.5 Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.6 Electrical Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

9.7 Fluid lifetime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.8 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.9 Cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.9.1 Commonly used fluids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

9.9.2 Water. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.9.3 Ethylene Glycol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.9.4 Mineral Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9.9.5 Silicone oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.9.6 Heat Transfer Salt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

9.10 Fluid Characteristics Charts . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.10.1 Limitations and Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

9.10.2 About the Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10.1 The Heater Indicator LED Stays Red But The Temperature Does Not In-

crease. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10.2 The Controller Display Flashes “CUT-OUT” And The Heater Does Not Oper-

ate. 41

10.3 The Display Flashes “CUT-OUT” And An Incorrect Process Temperature. . . 41

10.4 The Displayed Process Temperature Is In Error And The Controller Remains In

The Cooling Or Heating State At Any Set-point Value. . . . . . . . . . . . . . . . . 42

10.5 The Controller Controls Or Attempts To Control At An Inaccurate Tempera-

ture. 42

10.6 The Controller Shows That The Output Power Is Steady But The Process Temper-

ature Is Unstable.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

10.7 The Controller Alternately Heats For A While Then Cools. . . . . . . . . . . 42

10.8 The Controller Erratically Heats Then Cools, Control Is Unstable. . . . . . . . 42

vii

1 Introduction

The Hart Scientific Model 6054 Calibration Bath is a

highly stable constant temperature liquid bath. It has

been designed for calibrating liquid and glass ther-

mometers or other types of long thermometers

against a known temperature standard such as a

Standard Platinum Resistance Thermometer

(SPRT).

The 6054 calibration bath provides the following fea-

tures:

•A deep fluid tank (test well is 7.5 inches in di-

ameter and has 24 inches of fluid depth).

•It provides a highly temperature stable low gra-

dient environment typically a nominal stability

of ±0.005°C with oils. The fluid is well stirred

and environmentally protected to minimize

gradients.

•The fluid level is near the top of the test well to

facilitate calibration of liquid and glass ther-

mometers without needing to compensate for

stem effect.

•The bath provides two calibration modes. An

electronically controlled mode uses a hybrid

digital and analog PI controller with lock in am-

plifier design. The temperature and other func-

tions are selected with the four button keypad

to a hundredth of a degree and finer with a digi-

tal vernier adjustment. The Drift mode by-

passes the controller with heater power

manually controlled with variable transformer.

Introduction

2 Specifications

Specifications

Power Required . . . . . . . . . 230 VAC; 60 Hz; 15 Amps max.

Bath Temperature Range . . . . 50°C to 325°C

Temperature Stability. . . . . . . ±0.005°C to 200°C, ±0.010°C to 325°C

Temperature Uniformity . . . . . ±0.005°C max

Controller Accuracy . . . . . . . ±0.5°C

Test Well Area . . . . . . . . . . 7.5-inches dia X 24-inches deep

Heater . . . . . . . . . . . . . . Electrical, 5 positions; 1=off, 2=250, 3=500, 4=750 & 5=1,000 watts at

240 VAC line

Boost Heater . . . . . . . . . . . 750watts

Heat Transfer Liquid . . . . . . . Fluids compatible with stainless steel may be used. (e.g. oils such as

Dow Corning 710 and 210H or Hart Salt)

Exterior Dimensions . . . . . . . Height 56" X Width 31" X FB 23"

Weight . . . . . . . . . . . . . . 156 Lbs.

Table 1

Specifications

3 Theory of Operation

The components, features and operational theory of

the Model 6054 calibration bath are described in this

section.

3.1 Two Modes of

Temperature Control

Two modes of temperature control are available with

the model 6054. The TEMPERATURE CONTROL

mode or the TEMPERATURE DRIFT mode may be

selected by a switch on the front panel.

3.1.1 The Temperature Control Mode

The control mode uses a hybrid digital/analog PI tem-

perature controller with lock-in-amplifier. The bath

stability is very high with this controller. The tempera-

ture is selected using a four button keypad on the front

panel. Temperatures from 0.00 to 325.00°C may be

selected directly to a hundredth of a degree. Finer ad-

justment is available using the vernier adjustment.

Accuracy of the setting is typically ±0.5°C or better.

The controller pulses AC current to the control heat-

ers in a time modulated fashion to compensate for

heat gains and losses to the system. A two color LED

on the control panel glows red when the heaters are

on and glows green when they are off and cooling is

taking place. (Note: The cooling required for control is

supplied through heat loss to ambient.)

The Temperature control probe uses a 100 ohm PRT.

It is a totally separate unit for ease of replacement. It is

inserted into the top of the bath near the stirring motor

as shown and plugs into the rear of the control unit.

The heaters are external to the tank. They are ar-

ranged electrically to provide the 4 control heating po-

sitions plus an off position. The additional boost

heating position is accessed from a separate switch

on the control panel.

3.1.2 The Temperature Drift Mode:

In the Temperature Drift mode the heater may be set

manually to allow the temperature to drift very slowly

(a few milli-°C per minute) over the desired range.

This allows the control noise to be eliminated al-

though greater skill is required in making calibrations.

The heater power is adjusted by means of a variable

transformer located on the control panel. It allows po-

sition one of the heater selection switch to be continu-

ally variable from 0 to 100% Positions 2, 3, 4 and

Boost add their full value of heat incrementally to the

adjusted value of position 1.

3.1.3 The Fluid system

The fluid system consists of the insulated tank, the

stirrer assembly, the condensate drain, the overflow

test well, and the fluid itself. The heaters and probe,

which are part of the control system, are physically

external to the tank.

The tank and other wetted parts are made of stainless

steel for compatibility with most practical

thermostating fluids.The stirrer is attached to the tank

top plate of the bath and its motor receives additional

cooling from a fan to keep from overheating and in-

crease lifetime at high bath temperatures. The stirrer

directly drives four 2-inch diameter stirring propellers.

The down draft from the propellers forces the bath

fluid through the overflow test well. The stirring motor

plugs into the rear of the control unit. (See Figure 3 on

page 14.)

The over-flow test well serves to provide a constant

depth of fluid at an essentially constant height near

the well opening. Variations in fluid volume due to

thermal expansion and volatilization will not effect

measurements within reasonable volume ranges.

The fluid expelled from the tank is controlled to flow

past the control heaters first before entering the main

tank for thermal management.

A drain is provided for convenience in changing the

bath fluid. (See draining the tank.)

The condensate drain collects condensed oil vapor

and oil that has expanded over the top of the tank

walls.Tubes on either side of the drain at the bottom of

the bath allow the liquid to be collected into a pan. Be

sure this pan is in place at all times to prevent oil from

draining onto the floor The condensate pan must be

Theory of Operation

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