Brookfield 75 User Manual

BROOKFIELD MODEL 75

TEMPERATURE CONTROLLER

Operating Instructions

Manual No. M/98-205-A0100

SPECIALISTS IN THE
MEASUREMENT AND
CONTROL OF VISCOSITY

BROOKFIELD ENGINEERING LABORATORIES, INC.

11 Commerce Blvd., Middleboro, MA 02346 USA

TEL[phone]
F

AX

508-946-6262

Brookfield Engineering Labs., Inc. Page 1 Manual No. M/98-205-A0100

or 800-628-8139 (USA excluding MA)

NTERNET

I

http://www.brookfieldengineering.com

Contents

I.INTRODUCTION .................................................................................................. 3

II.SPECIFICATIONS ................................................................................................ 3

II.1 Power............................................................................................................. 3

II.2 Controller ....................................................................................................... 3

III.INSTALLATION .................................................................................................... 4

III.1 Probe ............................................................................................................ 4

III.2 Recorder ....................................................................................................... 4

III.3 AC, Power Switch and Power Fuse .............................................................. 5

III.4 Load .............................................................................................................. 5

IV.CONTROL KEYS AND DISPLAY PANEL ........................................................... 6

IV.1 The °F/°C Key .............................................................................................. 6

IV.2 The RUN/STBY Key .................................................................................... 6

IV.3 The SET Key ............................................................................................... 7

IV.4 The Arrow (direction) Keys .......................................................................... 7

IV.5 The HEAT LED ............................................................................................ 7

IV.6 The RUN LED .............................................................................................. 7

IV.7 Piezo Buzzer................................................................................................. 7

V. TEMPERATURE CONTROLLER OPERATION .................................................. 7

V.1 Powering Up the Model 75 Temperature Controller....................................... 7

V.2 Setting a Temperature ................................................................................... 8

VI. ERROR MESSAGES AND FAIL SAFES ........................................................... 9

VI.1 Open Sensor Error ....................................................................................... 9

VI.2 Thermosel Overheat Error.......................................................................... 10

VI.3 High/Low Temperature Limit Error.............................................................. 10

VII. TROUBLESHOOTING .................................................................................... 10

Appendix A - Warranty Repair and Service ........................................................... 11

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I. INTRODUCTION

The Model 75 T emperature Controller is part of the Brookfield Thermosel accessory to allow for
viscosity measurements at elevated temperatures. The unit includes a solid state proportional
temperature controller, a means for entering the desired temperature setpoint and appropriate
status indicators.

The front panel is used to display and enter setpoint temperatures. The front panel also presents
the status of the system (e.g. the current temperature of the Thermosel and any error messages).

A list of the parts shipped with the Model 75 Controller is provided below. If any parts are miss­ing or damaged, please contact Brookfield or your local authorized representative immediately.

Model 75 System Contents

Description Part Number Quantity

Temperature Controller HT-109 1
RTD Temperature Probe DVP-94Y 1
Operating Instructions Manual M/98-205 1
Recorder Output Cable HT-88Y 1

A.C. Power Cord DVP-65 (115v) 1

DVP-66 (230V) 1

TABLE 1

II. SPECIFICATIONS

II.1 Power

Voltage Specifications

(check the label beneath the Temperature Controller

Input V oltage/Frequency for the voltage requirements of your unit)

II.2 Controller

Range above ambient to 300°C/572°F
Resolution 0.1 °C or °F
Reading ±1.0°C up to +150°C

Accuracy ±2.0°C +150 to 300°C
Setpoint The temperature will be maintained within 0.3°C of
Stability the setpoint.
Recorder Output Voltage 0 to 4 Volts

85-265 VAC; 50/60 Hz

TABLE 2

Temperature Controller Specifications

1 volt = 0°C/32 °F; 4 volts = 300°C/572°F

TABLE 3

Note: The temperature accuracies stated above are a result of the combined accuracies of

the Model 75 Controller, the RTD temperature probe, and the Thermo Container.

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Thermosel Container

Thermosel Container Specifications

Range above ambient to 300°C/572°F

Accuracy ±0.5% of the controller setpoint

TABLE 4

III. INSTALLATION

Plug the R TD Temperature Probe (DVP-94Y) into the “probe” receptacle, the Thermo Container
into the “Thermosel” receptacle, and a strip chart recorder (if used) into the recorder jack. The
rear panel will appear as follows in Figure 1.

OFF ON

Thermosel

Probe

F
U
S
E

Power Input

Figure 1

III.1 Probe

Recorder

The probe is a 100 ohm precision platinum RTD (Resistance Temperature Detector) probe
(Brookfield Part No. DVP-94Y) which is plugged into the probe port on the rear panel.

Note: The RTD Probe must be plugged into the Model 75 Controller and the RTD Probe end

must be inserted into the Thermo Container before power is turned on. An error message
will be displayed if the Model 75 Controller is turned on and the RTD Probe is not in­stalled.

III.2 Recorder

The recorder jack provides a signal to a recording device (the HT-88Y cable is provided for this
service) such as a strip chart recorder . The full scale recorder output signal range is from 0 to 4 V
for the Thermosel. The temperature can be obtained from the output potential (in mV) as follows:

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The 0 to 4 volt output corresponds to a temperature range of -100°C (-148°F) to 300°C (572°F).
Realistically, temperatures in the Thermosel will typically be above ambient. Therefore, output
voltages will generally range from slightly less than 2 volts (<100°C) to the full 4 volts (300°C).

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The temperature corresponding to any intermediate output voltage can be obtained from the fol­lowing:

(0.1 x mV) - 100 = °C (Centigrade T emperatures)
(0.18 x mV) - 48 = °F (Fahrenheit Temperatures)

For example, the temperature corresponding to a reading of 2.5 V (2500 mV) would be calcu­lated as follows:

(0.1 x 2500) - 100 = 150°C or (0.18 x 2500) - 148 = 302°F

The recorder jack is a standard 1/4" phono jack. An analog output cable (Brookfield Part No.
HT-88Y) is provided with the Model 75 Controller. Single channel and dual channel strip chart
recorders are available from Brookfield.

III.3 AC, Power Switch and Power Fuse

The power requirement for the Model 75 Controller is 85-265 VAC, 50/60 Hz. and must be
connected through the power cord. The voltage for which the unit has been configured will be
indicated on the bottom of the Model 75 Controller. The power consumption at 120 VAC is 400
mA plus the Thermo Container load power.

The power fuses must be 3A/ 250V fast blow Littlefuse type 3AG 312.003 or equivalent. These
fuses protect the controller electronics only on the hot and neutral lines.

III.4 Load

The “Thermosel” connector is provided to supply power to the Thermo Container . The connector
is specially keyed so that other loads cannot be readily substituted. The power limit supplied by
this connector is 300 watts.

Note: The current provided to the Thermosel connector is potentially dangerous. Do not insert

or remove the load plug while power is applied to the Model 75 T emperature Controller .

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IV. CONTROL KEYS AND DISPLAY PANEL

The front panel of the unit which includes all user controls and status indicators is shown in
Figure 2:

Temperture Controller

°F
°C

RUN

HEAT

SET

Figure 2

RUN

STBY

The digital display is used to set temperature values, to show system status during operation and
to present certain messages to the user.

The allowable range for temperature entries is from 0°C to 300.0°C (32.0°F to 572.0°F), with a
minimum increment of 0.1° (either scale). If a proposed temperature value is above the maxi­mum or below the minimum input, an audible sound (beep) will be heard and the current maxi­mum (or minimum) value will be displayed.

The various buttons and light emitting diodes (LED’s) have the following functions or meanings:

IV.1

°F

The °F/°C Key

°C

This key is used to toggle the units in which temperature is displayed and entered. The rightmost
digit in the main display indicates the units currently being used (F = Fahrenheit; C = Centi­grade).

IV.2

The
setpoint operation, press
of the controller. When the Temperature Controller is operating, pressing the

RUN

The RUN/STBY Key

key initiates or stops operation of the Model 75 Controller. To initiate a temperature

RUN

. The LED labeled “RUN” will light up to indicate the present status

STBY

RUN

key will place

STBY

RUN

STBY

STBY

the unit in a standby mode and cease control of the Thermo Container.

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IV.3

SET

The SET Key

The SET key is pressed when the operator wants to view or edit temperature data.

IV.4 The Arrow (direction) Ke ys

The ARROW keys are used to increment (or decrement) temperature values. To input tempera­tures, a single press of either of these keys will result in a single digit increment in the displayed
temperature value. When large temperature steps are required, the user will find it simpler to
press and hold these keys and scroll through available numbers. At first, this will result in a slow
increment (or decrement) of the display temperature. However, after a couple of seconds, the
display will rapidly increment (or decrement) and the user must be careful not to overshoot (or
undershoot) the desired input value.

IV.5 HEA T

The HEAT LED

The HEAT LED is illuminated when the controller is providing power to the Thermo Container.
The LED will flash at a rapid rate when the temperature of the Thermo Container is being main­tained at a set temperature.

IV.6 RUN

The RUN LED

The RUN LED is illuminated when the temperature of the Thermo Container is being controlled
by the Model 75 Controller.

Piezo Buzzer

IV.7

The unit includes a buzzer which will provide an audible tone (beep) in the following situations:

• During the Model 75 Controller’s startup sequence.

• If an unacceptable data entry has been made (e.g. attempting to set a temperature above or
below the allowable inputs).

• If the temperature probe is not plugged in or becomes disconnected.

V. TEMPERATURE CONTROLLER OPERATION

V.1 Powering Up the Model 75 Temperature Controller

The Model 75 Controller is turned on by placing the rear panel mounted ON/OFF switch in the
ON position. The buzzer will “beep” and, after a few seconds, the digital display will indicate the
present temperature of the Thermo container. When the unit is initialized, all of the indicator
LED’s are off.

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V.2 Setting a Temperature

1) Press the

Note: The Model 75 Controller will display the last set point temperature value upon

SET

key.

entering the temperature setpoint screen.

If you do not press either of the

or

keys or the

SET

key within approximately 4-5

seconds, the Model 75Controller will “beep” and revert to its non setpoint mode (the

SET

temperature will again be displaying tenth degree values). Simply press the

key again

to re-enter the temperature setpoint mode.

2) A press of either the

or

keys will cause the tenths degree digit to stop flashing and
the tenths degree value to begin incrementing (or decrementing) at a one-to-two character
per second rate. When the scrolled tenths value exceeds ten-tenths of a degree (i.e. one
degree) in either direction, the scroll speed will then accelerate and the ones digit will then
be incremented (or decremented) as required. If the or keys are held in for an
extended time, the scroll speed will again increase to its maximum rate.

3) If the user lets up on an

or

key for more than the 4-5 second timeout period, the

display will revert to that of the current Thermo Container temperature with no change in

SET

the setpoint temperature taking place. At this point, a press of the

key will display the
last valid setpoint temperature that existed before the user began to change the setpoint
temperature.

4) If the user lets up on the
then re-presses an

or

or

key for less than the 4-5 second timeout period, and

key, the display will return to the tenths degree digit set mode

and again the temperature set mode as described above.

5) If the user scrolls to some new setpoint temperature, lets up on the
presses the
new set point temperature. If the user had pressed the

SET

key, the Model 75 Controller will accept the scrolled to temperature as the

RUN

STBY

instead of the

or

SET

keys and

key, the

Model 75 Controller would have begun controlling the Thermo Container at the new
scrolled-to setpoint temperature. In this case, the RUN LED would illuminate and the

HEAT

LED may or may not be lit depending on the temperature in the Thermo Con­tainer compared to the setpoint temperature. In any case, the Model 75 Controller action
will regulate the temperature of the Thermo Container to the new setpoint temperature. The
current temperature of the Thermosel Container will be displayed on the front panel digital
display with the RUN LED illuminated. Power will be provided to the Thermo Con­tainer if the new setpoint temperature is above the previous temperature of the Thermo
Container. When power is provided to the Thermo Container, the HEAT

LED will be

illuminated. The Model 75 Controller will provide power to reach the indicated set point
and maintain it at that level indefinitely.

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Note: The last scrolled-to-temperature (the last setpoint temperature) will be retained in

non-volatile memory and will become the default setpoint temperature the next time
the temperature controller is powered up.

6) Temperature control of the Thermo Container will be maintained for as long as the Model

75 Controller is powered up, or until the

VI. ERR OR MESSAGES AND FAIL SAFES

If the display shows an error message or there is a continuous “beeping”, you are in one of
the following error conditions:

1) The RTD probe has become disconnected from the Model 75 Controller. Plug the RTD probe

in to correct the error.

2) The Model 75 Controller is providing power to the Thermo Container, but the temperature

sensor is not reporting an increase in temperature. The power to the Thermo Container will be
interrupted. It will be necessary to power down the Model 75 Controller and determine the
cause of the fault before continuing operation.

3) The Model 75 Controller sensed a temperature higher or lower than its built-in limits. The

following paragraphs provide further detail.

VI.1 Open Sensor Error

If the sensor fails or an open circuit condition occurs (infinite resistance), the unit will cause a
probe error as follows:

RUN

STBY

key is pressed to stop the control action.

0ˉ

Note that this error message could be momentarily preceded by either of the following displays:

lÏ--

h1-

The Model 75 Controller will stop control and will stay in this state until the problem is corrected.
This is usually due to the R TD temperature probe not being plugged into the Model 75 Controller .
Once corrected, the unit will return to viewing the “controlled” temperature.

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-

VI.2 Thermosel Overheat Error

If the sensor becomes dislodged or is left out of the Thermo Container or if the Thermo Container
coils become “open”, and the Model 75 Controller is not sensing a temperature rise while dis­pensing power to the Thermo Container, it will display the following message after approxi­mately a 3-minute delay:

eÂÂ

The Model 75 Controller will stop control and will stay in this state until the problem is corrected.
The only way to correct this error is to turn off the Model 75 Controller and then turn it back on.

VI.3 High/Low Temperature Limit Error

If a temperature outside of the Temperature Controllers high or low temperature limits is de­tected, either of the two messages ­stop control and will stay in this state until the problem is corrected. Once corrected, the unit will
return to viewing the controlled temperature.

LoLo

Lo- or -

LoLo

HIHI

HI- will be displayed. The Model 75 Controller will

HIHI

VII. TROUBLESHOOTING

In the event that the Model 75 Controller does not appear to be working, disconnect the unit from
the power source (mains) and check the power fuses (located in a removable section of the power
input block) to determine whether they are still functional. Refer to Figure 1, Section III - use
screwdriver to remove fuse holder.

The power fuses protect the controller electronics. These fuses (Brookfield Part No. HT-98H) are
3A/ 250V fast blow Littlefuse type 3AG 312.003 or equivalent.

The Model 75 Controller is designed to require a minimum amount of user maintenance. There
are no user serviceable parts inside the unit. In the event of difficulties with the product, con-
tact Brookfield Engineering Laboratories or its authorized representative. Please have the serial
number of the unit available (the serial number is indicated on a label on the bottom of the
controller).

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Appendix A - Warranty Repair and Service

Warranty

The Brookfield Model 75 Temperature Controller is guaranteed for one year from date of purchase
against defects in materials and workmanship. The Controller must be returned toBrookfield Engi­neering Laboratories, Inc. or the Brookfield dealer from whom it was purchased for no charge warranty
service. Transportation is at the purchaser’s expense.

For repair or service in the United States return to:

Brookfield Engineering Laboratories, Inc.

11 Commerce Boulevard

Middleboro, MA 02346 U.S.A.

Telephone: [phone] FAX: [phone]

For repair or service outside the United States, consult Brookfield Engineering Laboratories, Inc. or
the dealer from whom you purchased the instrument.

For repair or service in the United Kingdom, return to:

Brookfield V iscometers Limited

1 Whitehall Estate

Flex Meadow

Pinnacles West

Harlow, Essex CM19 5TJ, United Kingdom

Telephone: [phone] FAX: [phone]

For repair or service in Germany, return to:

Brookfield Engineering Labs. Vertriebs GmbH

Barbarossastrasse 3

D-73547 Lorch, Germany

Telephone: [phone] FAX: [phone]

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