Refrigerated Circulators
User’s Manual
Manual P/N U00971
Rev. 02/14/08
PolySt at® Refrigerated Circulator
Preface
Safety
General Information
Installation
Instruction and Operation Manual
Compliance ............................................................ 3
Unpacking .............................................................. 3
Warranty ................................................................ 3
Warnings................................................................ 4
Description ............................................................. 5
Specifications ........................................................ 5
Site ........................................................................ 6
Electrical Requirements ......................................... 7
Plumbing Requirements ........................................ 8
Fluids ..................................................................... 9
Filling Requirements ............................................. 9
Operation
Digital Controller
Advanced Digital
Controller
Controllers ........................................................... 10
Start Up ................................................................ 10
Main Display ........................................................ 11
Key Button Definition ........................................... 11
Viewing Setpoint .................................................. 11
Changing Setpoint ............................................... 11
Setup Loop .......................................................... 12
Calibration Loop ................................................... 13
Main Display ........................................................ 14
Key Button Definition ........................................... 14
Changing Setpoint ............................................... 14
Viewing Setpoint .................................................. 14
Setup Loop .......................................................... 15
Calibration Loop ................................................... 16
- 1 -
Programmable
Controller
Additional Features
Maintenance &
Troubleshooting
Main Display ........................................................ 17
Key Button Definition ........................................... 17
Changing Setpoint ............................................... 18
Programming Loop .............................................. 18
Setup Loop .......................................................... 19
Calibration Loop ................................................... 21
Sample Program .................................................. 22
DB9 Connector Pinouts ....................................... 23
RS-232 Serial Communications Protocol ............. 24
High Temperature/Low Liquid Safety ................... 25
Cleaning ............................................................... 26
Algae.................................................................... 26
Checklist .............................................................. 26
PID Values ........................................................... 27
Appendix
Water Quality Standards and Recommendations
- 2 -
Compliance
Unpacking
Warranty
Preface
Products tested and found to be in compliance with the requirements defined
in the EMC standards defined by 89/336/EEC as well as Low Voltage
Directive (LVD) 73/23/EEC can be identified by the CE Mark on the rear of
the unit. The testing has demonstrated compliance with the following directives:
LVD, 73/23/EEC Complies with IEC/EN61010-1
EMC, 89/336/EEC IEC/EN61326-1
For any additional information, refer to the Declaration of Conformity that
shipped with the unit.
Retain all cartons and packing material until the unit is operated and found to
be in good condition. If the unit shows external or internal damage contact
the transportation company and file a damage claim. Under ICC regulations,
this is your responsibility.
The Cole-Parmer circulators distributed by Cole-Parmer, Cole-Parmer
warrants to the direct purchaser that the product will be free from defects in
material or workmanship for a period of two years from the date of delivery.
Cole-Parmer will repair or replace the product or provide credit, as its sole
option, upon prompt notification and compliance with its instructions.
The Distributor warrants to Customer that upon prompt notification and
compliance with Distributor's instructions, that the Distributor will repair or
replace, at Distributor's sole option, any Product which is defective in material or workmanship.
Distributor expressly disclaims all other warranties, whether expressed,
implied or statutory, including the warranties of merchantability, and fitness
for a particular purpose. Distributor's sole responsibility and the Customer's
exclusive remedy for any claim arising out of the purchase of any Product is
repair or replacement, as described above. In no event shall Distributor's
liability exceed the purchase price pain therefor; nor shall Distributor be liable
for any claims, losses or damage of any third party or for lost profits or any
special, indirect, incidental, consequential, or exemplary damages, howsoever arising, even if Distributor has been advised of the possibility of such
damages.
- 3 -
Warnings
Safety
In addition to the safety warnings listed below, warnings are posted throughout
the manual. These warnings are designated by an exclamation mark inside an
equilateral triangle with text highlighted in bold print. Read and follow these
important instructions. Failure to observe these instructions can result in
permanent damage to the unit, significant property damage, personal injury or
death.
The lightning flash with arrow symbol, within an equilateral triangle, is
intended to alert the user to the presence of non-insulated "dangerous
voltage" within the unit's enclosure. The voltage may be of significant magnitude to constitute a risk of electrical shock.
This label, engraved into the front of the tank lip, indicates the presence of
hot surfaces.
Make sure you read and understand all instructions and safety precautions
listed in this manual before installing or operating your unit. If you have any
questions concerning the operation of your unit or the information in this
manual, contact our Sales Department.
Performance of installation, operation, or maintenance procedures
other than those described in this manual may result in a hazardous
situation and may void the manufacturer's warranty.
Transport the unit with care. Sudden jolts or drops can damage the
unit's components.
Observe all warning labels.
Never remove warning labels.
Never operate damaged or leaking equipment.
Never operate the unit without fluid in the circulator.
Use water unless operating above 80°C or below 7°C. Above 80°C use
Dow 200 silicon oil. For operation below 7°C, a 50/50 mixture, by volume, of filtered tap water and laboratory grade ethylene glycol is
suggested.
Always turn off the unit and disconnect the line cord from the power
source before performing any service or maintenance procedures, or
before moving the unit.
Always empty the circulator before moving the unit.
Never operate equipment with damaged line cords.
Refer service and repairs to a qualified technician.
- 4 -
Description
Specifications
Temperature Range °C
Digital -20 to +150 -20 to +150 -30 to +150 -25 to +100
Advanced Digital -20 to +200 -20 to +200 -30 to +200 -25 to +100
Programmable -20 to +200 -20 to +200 -30 to +200 -25 to +100
General Information
The PolyStat® Refrigerated Circulators are designed to provide temperature control for
applications requiring a fluid work area or pumping to an external system.
The units consist of a circulation pump, stainless steel reservoir, a work area
cover, and a temperature controller.
R6L R6LP R13L R28L
1
Temperature Stability
Digital ±0.05 ±0.05 ±0.05 ±0.05
Advanced Digital ±0.01 ±0.01 ±0.01 ±0.01
Programmable ±0.01 ±0.01 ±0.01 ±0.01
Pumping Capacity
60Hz 15 lpm at 0 psig 15 lpm at 0 psig 15 lpm at 0 psig 15 lpm at 0 psig
50Hz 12 lpm at 0 psig 12 lpm at 0 psig 12 lpm at 0 psig 12 lpm at 0 psig
Cooling Capacity Watts
(60Hz/50Hz)
@+20°C 350 / 290 350 / 290 660
@ 0°C 120 / 100 190 / 175 480 / 400 450 / 370
@ -10°C 90 / 75 90 / 85 - -
@-20°C - - 200 / 165 175 / 145
Heater Watts
60/50Hz 800 / 1000 800 / 1000 800 / 1000 800 / 1000
Circulator Work Area
(L x W x D)
Inches 5¼ x 8 x 6 5¼ x 8 x 6 5¼ x 9 x 8 11½ x 11¼ x 8
Centimeters 13.3 x 20.3 x 15.2 13.3 x 20.3 x 15.2 13.3 x 22.9 x 20.3 29.2 x 28.6 x 20.3
2
3
1
4
/ 545
4
7004 / 580
4
Reservoir Volume
Gallons/Liters 1½ / 6 1½ / 6 3
7
/16 / 13 73/8 / 28
Dimensions
(L x W x H)
Inches 15¾ x 10 x 21½ 15¾ x 18¾ x 15
5
/8 175/8 x 15 x 261/8 22 x 27½ x 185/8
Centimeters 40.0 x 25.4 x 54.6 40.0 x 47.6 x 39.7 44.8 x 38.1 x 66.4 55.9 x 69.9 x 47.4
Shipping Weight
Pounds/Kilograms 79 / 36 70 / 32 112 / 51 162 / 73
1. Low-end temperatures and cooling capacities achieved using a fluid with a specific gravity of 0.5.
2. Stability is measured at fluid temperature of 20°C, ambient of 20°C, with water as the fluid and not
in maximum cooling mode.
3. Pumping capacity for units operating at fluid temperature of 20°C, ambient of 21°C, using water.
4. 20°C heat load data taken in maximum cooling mode.
5. R28L shipping weight includes a 23 pound (10 Kilograms) skid.
- 5 -
Site
Installation
Never place the unit in a location where excessive heat, moisture, or
corrosive materials are present.
Locate the unit on a sturdy table or bench top.
Ambient Temperature Range +50°F to +89.6°F (+10°C to +32°C)
Relative Humidity Range 10% to 80% (non-condensing)
Operating Altitiude Sea Level to 2000 meters (6562 feet)
Overvoltage Category II
Pollution Degree 2
The unit has an air-cooled refrigeration system. Air is drawn through the front
panel and discharged through the rear panel. The unit must be positioned so
the air intake and discharge are not impeded. A minimum clearance of
12 inches (30 centimeters) at the front and rear of the unit is necessary for
adequate ventilation. Inadequate ventilation will reduce cooling capacity and,
in extreme cases, can cause compressor failure.
Excessively dusty areas should be avoided and a periodic cleaning schedule
should be instituted, see Cleaning on page 26.
- 6 -
Electrical
Requirements
Line voltage may be easily accessible inside the pump/control box.
Always unplug the unit prior to removing the pump/control box cover.
The unit construction provides protection against the risk of electric
shock by grounding appropriate metal parts. The protection may not
function unless the power cord is connected to a properly grounded
outlet. It is the user's responsibility to assure a proper ground connection is provided.
Refer to the serial number label on the rear of the unit to identify the specific
electrical requirements of your unit.
Ensure the voltage of the power source meets the specified voltage, ±10%.
Electrical Service Required:
R6L/R6LP
Voltage Frequency Phase Branch Circuit Line Cord
Requirements Plug
115 VAC 60 Hz 1 15 A N5 - 15P
230 VAC 50 Hz 1 10 A CEE7
R13L/R28L
Voltage Frequency Phase Branch Circuit Line Cord
Requirements Plug
115 VAC 60 Hz 1 20 A N5 - 20P
230 VAC 50 Hz 1 16 A CEE7
- 7 -
Plumbing
Requirements
Ensure the unit is off before connecting tubing to the unit.
To prevent damage to the plumbing lines, always support the ¾"
fittings while installing/removing the pumping caps and lines.
Hose Connections
The pump connections are located at the rear of the pump box and are
labelled
capped with stainless steel serrated plugs.
The pump lines have ¼ inch male pipe threads for mating with standard
plumbing fittings. For your convenience two stainless steel adapters, ¼ inch
female pipe thread to 3/8 inch O.D. serrated fitting, are provided. (To ensure
proper fit, they should be installed using PTFE tape around the threads.)
Flexible tubing, if used, should be of heavy wall or reinforced construction.
Make sure all tubing connections are securely clamped. Avoid running
tubing near radiators, hot water pipes, etc. If substantial lengths of tubing
are necessary, insulation may be required to prevent loss of cooling capacity.
It is important to keep the distance between the unit and the external system
as short as possible, and to use the largest diameter tubing practical. Tubing
should be straight and without bends. If diameter reductions must be made,
make them at the inlet and outlet of the external system, not at the unit.
If substantial lengths of cooling lines are required, they should be pre-filled
with bath fluid before connecting them to the unit. This will ensure that a
adequate amount of fluid will be in the circulator once it is in operation.
(pump outlet) and (pump inlet). The connections are
Pumping
The pump is designed to deliver a flow of 15 liters/minute (4 gallons per
minute) at 0 feet head. To prevent external circulation, the INLET and
OUTLET lines are capped. The caps must be removed when external
circulation is required.
To properly secure the external hose connections to the unit, wrap PTFE
tape around the pipe line threads before installation. Once the hose connec-
tions are made, the pump must be properly plumbed to an external system. It
is important the circulator is not in operation until all plumbing is complete.
If
the circulator is not used for external circulation, make sure the stainless
steel caps are in place prior to operating the circulator.
- 8 -
Fluids
Filling
Requirements
Never use flammable or corrosive fluids with this unit.
Water is the recommended fluid for operation from +7°C to +80°C, see the
Appendix.
Dow 200 silicon oil is recommended for operation above +80°C.
Due to potential fire hazard, do not use any other fluid above +80°C.
For operation below +7°C, a 50/50 mixture, by volume, of laboratory grade
ethylene glycol and filtered tap water is suggested.
Never use pure ethylene glycol as a fluid. A maximum 80/20 mixture of
ethylene glycol and filtered tap water is allowed.
The circulator work area has a high and low level marker to guide filling. The
markers are 1 inch horizontal slits located in the center of the stainless steel
baffle separating the work area and the pump assembly. The correct fluid
level falls between these two markers. The heating and cooling coils will be
exposed and may become damaged if the correct fluid level is not provided.
When pumping to an external system, keep extra fluid on hand to maintain
the proper level in both the circulating lines and external system.
Never run the unit when the work area is empty.
When using Dow 200-50, ensure the work area contains no water
before filling the unit.
Dow 200-50 fluid will expand when heated.
- 9 -
Controllers
Start Up
Operation
Three temperature controllers are available with the unit: Digital, Advanced
Digital and Programmable. This section explains these three controllers.
Before starting the unit, check all electrical and plumbing connections and
make sure the work area has been properly filled with fluid.
To start any unit place the I/O switch on the side of the controller to the
I (power on) position. The pump will start and the controller display will light.
For units with the Digital Controller the refrigeration is manually controlled by
the ON/OFF switch on the side of the control box.
For units with standard controllers, the refrigeration is manually controlled by
the ON/OFF switch on the side of the control box. In addition, units R13L and
R28L have HI/LO refrigeration control. For optimal cooling, use HI when
operating at 20°C or below, otherwise use LO.
The refrigeration system is not designed to operate above 35°C. When
operating above 35°C ensure that the refrigeration is turned off.
If the FAULT light is illuminated see page 25.
NOTE: When the unit is shut off, wait approximately five minutes before
restarting. This allows time for the refrigeration pressures to equalize. If the
pressures are not allowed to equalize, the compressor will short-cycle
(clicking sound) and no cooling will occur.
- 10 -
Main Display
Digital Controller
The Digital Controller consists of a seven-segment LCD, unit-temperature
status indicators, a three-button keypad and a user-adjustable Proportional,
Integral and Derivative (PID) control.
The LCD Main Display normally indicates the fluid temperature.
°C
°F
Key Button Definition
Viewing Setpoint
Changing Setpoint
SET ENTER is used to change the current value or status of a function within
the software, and then to "accept" the new value or function.
NEXT is used as a means to quickly scroll through the software loops and
settings.
The up and down arrow keys are used to change a numeric value.
The setpoint is the desired fluid temperature. To view the setpoint, press
SET ENTER. The current setpoint will flash. Press SET ENTER again to
return to the temperature display.
To change the setpoint, press SET. The current setpoint will flash. Use the
arrow keys to change the setpoint. Scrolling includes three speed accelera-
tion. Press ENTER to accept the new setpoint. NOTE: If you do not press
ENTER, a time out will occur 30 seconds after the last key is pressed and
the old setpoint will be used.
- 11 -
Setup Loop
Pxx.x
I x.xx
Dx.xx
unit
The setup loop is used to adjust the PID control and change the temperature scale. (Preset PID values are P = 1.2, I = 0.20, D = 0.05.) To enter the
setup loop, from the main display press and hold NEXT for three seconds.
The display will indicate Pxx.x. NOTE: If a key is not depressed within 60
seconds, a "time out" will occur and the main display will revert to the fluid
NEXT key
temperature.
Press SET and the number will start flashing. Use the arrow keys to change
the value. Press ENTER to accept the new value. Press NEXT to display
the I parameter Ix.xx.
Press SET and the number will start flashing. Use the arrow keys to change
the value. Press ENTER to accept the new value. Press NEXT to display
the D parameter Dx.xx.
Press SET and the number will start flashing. Use the arrow keys to change
the value. Press ENTER to accept the new value. Press NEXT to display unit.
Press SET and the currently selected temperature scale lamp flashes. Use
either arrow key to change the scale. Press ENTER to accept the new
scale. Press NEXT to display the temperature.
MAIN DISPLAY
- 12 -
Calibration Loop
Lo
xxx.x
hi
Use the calibration loop to recalibrate the unit's temperature display. The
wider the temperature spread used, the more accurate the calibration.
NOTE: Changing the factory set calibration will affect the accuracy of the
controller. A time out is not used in this loop.
To enter the calibration loop, from the main display press and hold the
up arrow key while pressing ENTER - NEXT - ENTER. The display
will indicate Lo (low calibration temperature).
NEXT key
SET key
Press SET and the low calibration temperature will flash indicating it
can be changed. NOTE: Pressing NEXT instead of SET scrolls to the
high temperature calibration.
Use the arrow keys to change the displayed value to the actual fluid
temperature. Press ENTER to accept and the numbers will stop
flashing. NOTE: The calibration will adjust to the temperature value
read at the moment ENTER is pressed. Press NEXT to display hi
(high calibration temperature).
xxx.x
MAIN DISPLAY
Press SET and the high calibration temperature will flash indicating it
can be changed. NOTE: Pressing NEXT instead of SET scrolls to Lo,
the cold temperature calibration.
Use the arrow keys to change the displayed value to the actual fluid
temperature. Press ENTER to accept and the numbers will stop
flashing. NOTE: The calibration will adjust to the temperature value
read at the moment ENTER is pressed. Press NEXT to calibrate.
The calibration constants are calculated and GOOD or BAD is briefly dis-
played to indicate whether the calibration was accepted. The display will then
indicate the fluid temperature.
- 13 -
Main Display
Advanced Digital Controller
The Advanced Digital controller consists of a seven-segment LCD Display
with contrast control, heating/cooling status indicators, a four-button keypad
and user adjustable 0.1° or 0.01° display resolution. It also features on/off
refrigeration control, automatic min/max refrigeration control, audio/visual
alarm messages, user selected high/low temperature limits, RS232 communication, and a user-adjustable Proportional, Integral and Derivative (PID)
control.
The LCD Main Display indicates the fluid temperature as well as the current
setpoint temperature.
Key Button
Definition
Viewing Setpoint
Changing Setpoint
SET ENTER is used to change the current value or status of a function within
the software, and then to "accept" the new value or function.
The up and down arrow keys are used to change a numeric value and to
confirm, change or reject a question asked within the software.
The up and down arrow keys are used to change a numeric value.
The setpoint is the desired fluid temperature. To view the setpoint, press
SET ENTER. The current setpoint will flash. Press SET ENTER again to
return to the temperature display.
To change the setpoint, press SET. The current setpoint will flash. Use the
arrow keys to change the setpoint. Scrolling includes three speed accelera-
tion. Press ENTER to accept the new setpoint. NOTE: If you do not press
ENTER, a time out will occur 30 seconds after the last key is pressed and
the old setpoint will be used.
- 14 -
Setup Loop
SETUP LOOP?
MAIN DISPLAY
The setup loop is used to enable cooling, change the display
resolution, change the temperature scale, change temperature limits, adjust the PID values, enable/disable max cooling, and enable/disable RS232 communications.
COOLING ENABLED
PRESS NO TO CHANGE
RESOLUTION = 0.01
PRESS NO TO CHANGE
UNITS ARE C
PRESS NO TO CHANGE
U=K1(C+K2)+K3
Kn=xxx.x
HIGH T LIMIT xxx.xxC
LOW T LIMIT xxx.xxC
ENTER PID
CONSTRAINTS?
PROPORTIONAL
TERM
P=xx.x% OF SPAN
INTEGRAL TERM
I=x.xx REPEATS/MIN
DERIVATIVE TERM
D=x.xx MINUTES
To enter the setup loop, press and hold NEXT for three
NEXT key
Down arrow
Up arrow key
seconds. The display will indicate
SETUP LOOP?
NOTE: Pressing NO displays the software version and then the Main Display.
Also, the display times out 60 seconds after any key is pressed and reverts to
the Main Display.
Press NEXT or YES to display
COOLING ENABLED PRESS NO TO CHANGE. Press
NO to toggle between cooling enabled and cooling disabled.
Press NEXT to display RESOLUTION = 0.01 PRESS NO TO CHANGE. Press NO to
toggle the resolution between 0.1° and 0.01°.
Press NEXT to display UNITS ARE C PRESS NO TO CHANGE. Press NO to toggle the
scale between Fahrenheit (F), Celsius (C) or a user (U) scale.
NOTE: The following is needed only if a user (U) scale was selected. Press
NEXT to display U = K1(C + K2) + K3 Kn=xxx.x. Press SET and then use the
arrow keys to change the K values.
Press NEXT to display HIGH T LIMIT xxx.xxC LOW T LIMIT xxx.xxC. Press SET to
be able to use the arrow keys to change the high temperature limit. Press
ENTER to accept the new value. Press SET again to be able to change the
low temperature limit. Press ENTER to accept the new value. NOTE: To
bypass changing the high temperature value press SET twice when HIGH T
LIMIT xxx.xxC LOW T LIMIT xxx.xxC
is initially display.
Press NEXT to display ENTER PID CONSTANTS? (Preset PID values are P =
1.2, I = 0.20, D = 0.05.) Press NO to bypass changing the constants and
display SAVE SETUP? Press YES or NEXT to display PROPORTIONAL TERM P =
xx.x% OF SPAN
. Press SET and then use the arrow keys to change the value.
Press NEXT to display INTEGRAL TERM I = x.xx REPEATS/MIN. Press SET and
then use the arrow keys to change the value. Press NEXT to display DERIVA-
TIVE TERM D = x.xx MINUTES
. Press SET and then use the arrow keys to
change the value.
MAX COOLING DISABLED
PRESS NO TO CHANGE
RS232 DISABLED
PRESS NO TO CHANGE
SAVE SETUP?
PRESS YES OR NO
Press NEXT to display MAX COOLING DISABLED PRESS NO TO CHANGE. Press NO
to toggle between cooling modes.
Press NEXT to display RS232 IS DISABLED PRESS NO TO CHANGE. Press NO to
toggle between disabled and enabled, or press ENTER to use the displayed
mode.
Press NEXT to display SAVE SETUP? PRESS YES OR
Press YES to accept all the changes. Press NO
NO.
MAIN DISPLAY
to ignore all of them. With either choice the unit will
return to the Main Display.
- 15 -
Calibration Loop
CALIBRATE RTD?
NOTE: The Calibration Loop is not accessible if RS232 communications is
enabled.
Use the calibration loop to calibrate the RTD temperature probe. The wider
the temperature spread used, the more accurate the calibration. NOTE:
Changing the factory set calibration will affect the accuracy of the controller.
A time out is not used in this loop.
Run the temperature to a suitable low-end
MAIN DISPLAY
value. Once stabilized enter the calibration
loop. From the main display press and hold
NEXT while pressing, within three seconds,
ENTER - NO - ENTER. The display will
indicate
CALIBRATE RTD?
CALIBRATE LOW TEMP?
CAL RTD
LOW TEMP xxx.xxC
CALIBRATE HIGH TEMP?
CAL RTD
HIGH TEMP xxx.xxC
SAVE CALIBRATION?
PRESS YES OR NO
NEXT key
Up arrow key
MAIN DISPLAY
Down arrow
Press NEXT and the display indicates
CALIBRATE LOW TEMP? To perform a low
temperature calibration press YES or NEXT
and the display will indicate
CAL RTD LOW TEMP xxx.xxC. Press SET and
then use the arrow keys to change the
displayed value to the actual fluid temperature (as measured with a calibrated reference
thermometer). Press NEXT until the display
indicates SAVE CALIBRATION PRESS YES OR
Press YES to save the change. The
NO.
display will momentarily indicate BOTH HIGH
AND LOW CAL MUST BE DONE
then return to
the main display.
Run the temperature to a suitable high-end
value. Once stabilized reenter the calibration
loop. Press YES or NEXT until the display
indicates CALIBRATE HIGH TEMP? To perform
a high temperature calibration press NEXT
and the display will indicate CAL RTD HIGH
TEMP xxx.xxC.
Press SET and then use the
arrow keys to change the displayed value to
the actual fluid temperature (as measured
with a calibrated reference thermometer).
- 16 -
Press NEXT and the display will indicate SAVE
CALIBRATION PRESS YES OR NO.
Press YES to
save the change. The unit will return to the
main display.
Main Display
Programmable Controller
The Programmable Controller consists of a seven-segment LCD with contrast control, heating/cooling status indicators, a 12-button keypad and user
adjustable 0.1° or 0.01° temperature display resolution, external sensor input
with automatic switching in the event of external sensor failure. It also
features automatic on/off refrigeration control, automatic min/max refrigeration control, audio/visual alarm messages, automatic fixed temperature limit,
user selected high/low temperature limits, programmable temperature profile,
RS-232 communication and a user-adjustable Proportional, Integral and
Derivative (PID) control.
The LCD normally indicates the fluid temperature as well as the current
setpoint temperature, or the external temperature and setpoint.
Key Button Definition
SET ENTER is used to change the current value or status of a function within
the software, and then to "accept" the new value or function.
YES is used to confirm a question asked within the software.
NO is used to reject or change a function within the software.
NEXT is used as a means to quickly scroll through the software loops and
settings.
± is used to change the current numeric value from positive to negative, or
negative to positive.
SETUP is used to enter the controller's setup loop.
PROG is used to enter the controller's program loop.
ESC is used to backtrack to the previous screen within a software loop.
1 - 9 keys are used to enter a number.
- 17 -
Changing Setpoint
Program Loop
RUN PROGRAM A?
RUN PROGRAM B?
EDIT PROGRAM A?
A SET xxx.xxC
STEP n TIME hhh:mmm
A REPETITIONS nnn
FINAL SETPT xxx.xxC
To change the setpoint, press SET ENTER. The current setpoint will flash. If
the number to be entered is negative, press the +/- key. Otherwise, enter the
most significant digit of the number. The digit will appear in the least significant decimal position. As each digit is entered the previously entered digits
will shift up in significance. Enter trailing zeros as needed to obtain the
desired order of magnitude. Press SET ENTER to accept the new setpoint.
NOTE: If you do not press SET ENTER, a time out will occur 30 seconds
after the last key is pressed and the old setpoint will be used.
NOTE: The program loop is not accessible if the RS-232 communications is
enabled, see Setup Loop. The program loop is used to program the controller.
The controller can store up to two
programs, each with as many as ten
steps. (Refer to the Setup Loop on the
next page for other options.) A sample
NEXT key
Down arrow
Up arrow key
MAIN DISPLAY
ESC key
program is shown on page 22.
To enter the program loop, press and
hold PROG for three seconds. The
display will indicate RUN PROGRAM A? NOTE: A time out will occur 60
seconds after the last key is pressed and the program will revert to old
values and the display will revert to the fluid temperature.
The unit's are not shipped with stored programs. Before a program can
be run, it has to be edited and stored. Therefore, for initial program-
ming or program editing press NEXT to display RUN PROGRAM B? and
then press NEXT again to display EDIT PROGRAM A?
Press YES or NEXT to display the temperature, step number and time
duration. Steps start at 0. Press SET ENTER and using the keypad
enter the setpoint temperature. Press SET ENTER. Press SET ENTER
and enter the number of hours. Press SET ENTER. Press SET ENTER
and enter the number of minutes. Press SET ENTER.
EDIT PROGRAM B?
B SET xxx.xxC
STEP n TIME hhh:mmm
B REPETITIONS nnn
FINAL SETPT xxx.xxC
SAVE PROGRAMS?
MAIN DISPLAY
The display will increment to step 1. Repeat the procedure for the total
number of desired steps. To skip a number press SET ENTER twice.
To end a program with fewer than ten steps, enter 0 hours and 0
minutes.
Press NEXT to display the number of program repetitions. Press SET
ENTER and enter the number of reps. Press SET ENTER. Press SET
ENTER and enter the final setpoint for the program. Press SET ENTER.
Press NEXT to display EDIT PROGRAM B? Use the same procedures.
Press NEXT to display SAVE PROGRAMS? Press YES to save or NO
to ignore. The unit returns to the main display.
With program(s) saved, when the display reads RUN PRO-
pressing YES will start the program, pressing NO will
GRAM
stop it. With either choice the unit returns to the main display.
- 18 -
Setup Loop
SETUP LOOP?
REFRIGERATION OFF
WHEN SETPOINT >xxC
RESOLUTION = 0.01
PRESS NO TO CHANGE
UNITS ARE C
PRESS NO TO CHANGE
NOTE: The setup loop is not accessible if a program is running. If RS-232
communications is enabled, only the RS-232 portion of the setup loop is active.
The setup loop is used to enable refrigeration, change the display resolution,
change the temperature scale, change temperature limits, adjust the PID
control (preset PID values are P = 1.2,
MAIN DISPLAY
I = 0.20, D = 0.05.), selects internal or
external probe, enter the maximum
internal and external temperature differ-
ence and enable RS-232.
NEXT key
Down arrow
Up arrow key
ESC key
To enter the setup loop from the main
display, press and hold SETUP for three
seconds. The display will indicate SETUP LOOP? NOTE: A time
out will occur 60 seconds after the last key is pressed and the
display will revert to the fluid temperature.
U=K1(C+K2)+K3
Kn=xxx.x
HIGH T LIMIT xxx.xxC
LOW T LIMIT xxx.xxC
ENTER PID
CONSTRAINTS?
PROPORTIONAL TERM
P=xx.x% OF SPAN
INTEGRAL TERM
I=x.xx REPEATS/MIN
DERIVATIVE TERM
D=x.xx MINUTES
PROBE IS INTERNAL
PRESS NO TO CHANGE
MAX INTERN EXTERN
TEMP DIFFERENCE xxC
RS232 DISABLED
PRESS NO TO CHANGE
MAX COOLING DISABLED
PRESS NO TO CHANGE
Press YES or NEXT to display
SETPOINT>xxC.
Use the keypad to display the desired temperature.
REFRIGERATION OFF WHEN
The refrigeration system is not designed to
operate above 35°C.
Press NEXT to display RESOLUTION = 0.01 PRESS NO TO CHANGE.
Press NO to toggle between 0.1°C and 0.01°C display resolution,
press YES or NEXT to maintain the displayed resolution.
Press NEXT to display UNITS ARE C PRESS NO TO CHANGE. Press
NO to toggle between temperature scales Celsius (C), Fahrenheit
(F) and a user defined (U) scale. Press YES or NEXT to maintain
the displayed scale.
NOTE: The following is used only if a user (U) scale was selected.
Press NEXT to display U = K1(C + K2) + K3 Kn=xxx.x. Press SET ENTER
and use the keypad to change the values.
Press NEXT to display HIGH T LIMIT xxx.xxC LOW T LIMIT xxx.xxC.
Press SET ENTER and enter the high temperature limit. Press SET
ENTER to accept the new value. Press SET ENTER again to be
able to change the low temperature limit. Press SET ENTER to
accept the new value. NOTE: To bypass changing the high temperature value press SET ENTER twice when HIGH T LIMIT xxx.xxC
LOW T LIMIT xxx.xxC
is initially display.
SAVE SETUP?
PRESS YES OR NO
MAIN DISPLAY
- 19 -
Press NEXT to display ENTER
PID CONSTANTS?
Press NO to
bypass changing the constants and display PROBE IS INTERNAL PRESS NO TO
CHANGE
or press NEXT to display PROPORTIONAL TERM P = xx.x% OF SPAN.
Press SET ENTER and use the keypad to enter the desired value.
Press NEXT to display INTEGRAL TERM I = x.xx REPEATS/MIN. Press SET
ENTER and use the keypad to enter the desired value.
Press NEXT to display DERIVATIVE TERM D = x.xx MINUTES. Press
SET ENTER and use the keypad to enter the desired value.
Press NEXT to display PROBE IS INTERNAL PRESS NO TO CHANGE. Press NO
to toggle between internal or external probe or press YES or SET ENTER to
use the displayed probe.
Press NEXT to display MAX INTERN EXTERN TEMP DIFFERENCE xxC. Press
SET ENTER and use the keypad to enter the desired value.
Press NEXT to display RS232 IS DISABLED PRESS NO TO CHANGE. Press NO
to toggle between disabled and enabled or press YES or SET ENTER to use
the displayed mode.
Press NEXT to display MAX COOLING DISABLED PRESS NO TO CHANGE. Press
NO to toggle between disabled and enabled or press YES or SET ENTER to
use the displayed mode.
Press NEXT to display SAVE SETUP? PRESS YES OR NO. Press YES to accept
the changes. Press NO to ignore them. The unit will return to the main
display.
- 20 -
Calibration Loop
CALIBRATE?
CAL INTERNAL RTD?
NOTE: The calibration loop is not accessible if a program is running or if
RS-232 communications is enabled.
Use the calibration loop to calibrate the internal and external RTD tempera-
tures. NOTE: Changing the factory set calibration will affect the accuracy of
the controller. A time out is not used in this
loop.
MASTER DISPLAY
Run the temperature to a suitable low-end
value. Once stabilized enter the calibration
loop. From the main display press and hold
NEXT while pressing ESC - ENTER - ESC. The
NEXT key
Up arrow key
Down arrow
ESC key
display will indicate
CALIBRATE?
CALIBRATE LOW TEMP?
INTERNAL
LOW TEMP xxx.xxC
CALIBRATE HIGH TEMP?
INTERNAL
HIGH TEMP xxx.xxC
CAL EXTERNAL RTD?
CALIBRATE LOW TEMP?
Press YES or NEXT and the display indicates CAL INTERNAL
Press YES or NEXT and the display indicates CALIBRATE
RTD?
LOW TEMP?
LOW TEMP xxx.xxC
Press NEXT and the display indicates INTERNAL
. Press SET and use the keypad to change
the displayed value to the actual fluid temperature (as measured
with a calibrated reference thermometer). Press NEXT until the
display indicates CAL EXTERNAL RTD? Use the same procedure
to calibrate the external probe (if desired). Press NEXT until the
display indicates SAVE CALIBRATION PRESS YES OR NO. Press YES
to save the changes. The display will momentarily indicate BOTH
HIGH AND LOW CAL MUST BE DONE
then return to the main display.
Run the temperature to a suitable high-end value. Once stabilized reenter the calibration loop. Repeat the same procedure for
the high temperature calibration. Press NEXT and the display will
indicate SAVE CALIBRATION? PRESS YES OR NO. Press YES to
save the changes. The unit will return to the main display.
EXTERNAL
LOW TEMP xxx.xxC
CALIBRATE HIGH TEMP?
EXTERNAL
HIGH TEMP xxx.xxC
SAVE CALIBRATION?
PRESS YES OR NO
MASTER DISPLAY
- 21 -
Sample Program
This sample program A has three steps and two repetitions. The final
setpoint is 35.0°C. Enter these values as described on page 18.
Stepn SETxxx.xxC TIME hhh mmm
0 25.0 0 2
1 20.0 0 3
2 30.0 0 1
3 NA* 0 0
REPETITIONS nnnn FINAL SETPT xxx.xC
2 35.0
* Any value can be entered.
Pressing YES to RUN PROG A? returns to the MAIN DISPLAY which now
has a lower line reading:
PGM A 0 w 25.0C
A is the current program, 0 is the current step, w indicates a waiting phase
(described in the next paragraph) and 25.0 is the current setpoint.
A w is displayed when the program is waiting for the bath to heat or cool
from the previous setpoint to the current setpoint. When the bath tempera-
ture gets to within 0.5° of the current setpoint, the display changes to PGM A
0 r 25.0, the r indicating the running phase for that step. Actual step time
starts when the display turns to r.
The following graph displays this program and indicates the lower half of the
MAIN DISPLAY.
35°C
30°C
25°C
20°C
PGM A 0 w 25.0C
PGM A 1 w 20.0C
PGM A 0 r 25.0C
PGM A 1 r 20.0C
PGM A 2 w 30.0C
PGM A 0 w 25.0C
PGM A 2 r 30.0C
PGM A 1 w 20.0C
PGM A 0 r 25.0C
PGM A 1 r 20.0C
PGM A 2 w 30.0C
PGM A 2 r 30.0C
SETPOINT 35.0C
STEP 0
STEP 1
REPETITION 1 REPETITION 2
STEP 2
STEP 0
STEP 1
STEP 2
NOTE: There is no indication on the display as to which repetition the
program is in.
- 22 -
DB9 Connector
Pinouts
Additional Features
RS232 Connections DB9 Female (J3)
5 Common
3 Receive (RxD) (Data from computer)
2 Transmit (TxD) (Data to Computer)
External RTD DB9 Male (P2)
3 RTD2A
4 RTD2A
8 RTD2B
- 23 -
RS232 Serial
Communications
Protocol
Commands Description Response
(UPPERCASE only)
?[CR] Help Protocol Examples
A1[CR] Reports “OK” to indicate that RS232 is enabled [CR]OK[CR][CR]
S?[CR] Report temperature setpoint n[CR]OK[CR][CR]
Sn[CR] Change temperature setpoint to n [CR]OK[CR][CR]
F?[CR] Report bath temperature n[CR]OK[CR][CR]
U?[CR] Report bath temperature units (x = C, F or U) x[CR]OK[CR][CR]
C[CR] Change temperature units to °C [CR]OK[CR][CR]
F[CR] Change temperature units to °F [CR]OK[CR][CR]
U[CR] Change temperature units to °U (user defined units) [CR]OK[CR][CR]
&LH?[CR] Report high temperature limit n[CR]OK[CR][CR]
&LL?[CR] Report low temperature limit n[CR]OK[CR][CR]
&LHn[CR] Change high temperature limit to n [CR]OK[CR][CR]
&LLn[CR] Change low temperature limit to n [CR]OK[CR][CR]
&P?[CR] Report temperature resolution n[CR]OK[CR][CR]
&Pn[CR] Change temperature resolution (n = 1 or 2) [CR]OK[CR][CR]
Baud rate: 9600 Stop bits: 1
Parity: none Flow control: none
Data bits: 8
(number of decimal places)
[CR] = carriage return
n = numeric data
Error Messages Description
INPUT OR RANGE ERROR[CR][CR] Controller received a setpoint that was out of range.
REQUEST DENIED[CR][CR] Setpoint can be changed only while:
Displaying temperature
A value is not currently being entered
Not in program mode.
- 24 -
High Temperature/
Low Liquid
Level Safety
To protect your application, the adjustable High Temperature/Low Liquid
Level Safety (HIGH TEMP/LOW LEVEL) ensures the heater will not exceed
temperatures which can cause serious damage to your unit. A single temperature sensor, located on the heater coils in the circulator, monitors both
conditions. A High Temperature/Low Liquid Level fault occurs when the
temperature of the sensor exceeds the set temperature limit.
In the event of a fault, the unit will shut down and a FAULT LED will illuminate. The cause of the fault must be identified and corrected before the unit
can be restarted.
To set the safety, locate the HIGH TEMP/LOW LEVEL SAFETY adjustment
dial in back of the pump box. Turn the dial fully clockwise.
Start the unit. Adjust the setpoint for a few degrees higher than the highest
desired fluid temperature and allow the circulator to stabilize at the temperature setpoint. Turn the HIGH TEMP/LOW LEVEL SAFETY dial counterclockwise until you hear a click and the unit shuts down. The red FAULT LED on
the temperature controller will light to indicate a fault has occurred.
Cool the circulator and then, without moving the adjustment dial, turn the unit
off then back on.
-
+
HTC
- 25 -
Cleaning
Maintenance & Troubleshooting
Allow sufficient for the fluid to cool to room temperature before handling.
Turn the unit off before cleaning.
Routine cleaning can be achieved by simply sponging down the seamless
stainless steel tank with a mild soapy solution.
Do not use steel wool; its abrasiveness will lead to rusting.
Dry the circulator using a soft cloth.
For proper operation, the unit needs to pull substantial amounts of air
through a condenser. A build up of dust or debris on the fins of the condenser will lead to a loss of cooling capacity.
Periodic vacuuming of the condenser is necessary. The frequency of cleaning depends on the operating environment. After initial installation we recommend the wrapper be removed and a monthly visual inspection of the
condenser be made. After several months the frequency of cleaning will be
established.
Algae
Checklist
To restrict the growth of algae in the circulator, we recommend the circulator
cover be kept in place and that all circulation lines be opaque. This will
eliminate the entrance of light required for the growth of most common algae.
We recommend the use of Chloramine-T, 1 gram per 3.5 liters.
Unit will not start
Make sure the voltage of the power source meets the specified voltage,
±10%. Refer to the serial number label on the rear of the unit to identify the
specific electrical requirements of your unit.
Check the High Temperature/Low Liquid Level Safety. If the FAULT light is
on, make sure the fluid level in the circulator is between the marks in the
baffle and the HIGH TEMP/LOW LEVEL SAFETY setting is greater than the
fluid temperature. Turn the unit's I/O switch off then back on to reset the
safety.
- 26 -
Loss of cooling capacity
Be sure the cooling capacity of the unit has not been exceeded if circulating
to an external system.
When the unit is shut off, wait approximately five minutes before restarting.
This allows time for the refrigeration pressures to equalize. If the pressures
are not allowed to equalize, the compressor will short-cycle (clicking sound)
and no cooling will occur.
Proper ventilation is required for heat removal. Make sure ventilation
through the front and rear panels is not impeded and the panels are free of
dust and debris.
Ice build up on the cooling coils can act as insulation and lower the cooling
capacity. Raise the temperature of the circulator to de-ice the cooling coil
and increase the concentration of non-freezing fluid.
Check controller PID values, see below.
No external circulation
Make sure the stainless steel plugs on the PUMP INLET and PUMP
OUTLET have been removed.
PID Values
Check for obstructions, kinks, or leaks in the circulation tubing.
Circulation will cease when the pump head has been exceeded.
The PID values can be verified in the controller's Setup Loop. The factory
preset PID values are:
Digital P = 1.2 I = 0.20 D = 0.05
Advanced Digital P = 1.2 I = 0.20 D = 0.05
Programmable P = 1.2 I = 0.20 D = 0.05
- 27 -
Appendix Fluids
Water Quality Standards and Recommendations
Microbiologicals
(algae, bacteria, fungi) 0 0
Inorganic Chemicals
Calcium <25 <0.6
Chloride <25 <10
Magnesium <12 <0.1
Sulfate <25 <1
Total Hardness <17 <0.05
Unfavorably high total ionized solids (TIS) can accelerate the rate of galvanic
corrosion. These contaminants can function as electrolytes which increase
the potential for galvanic cell corrosion and lead to localized corrosion such
as pitting which can be observed at the studs and on the outside surface of
cooling coils. Eventually, the pitting will become so extensive that the coil will
leak refrigerant into the water reservoir.
Permissible (PPM) Desirable (PPM)
For example, tap water in the U.S. averages 171 ppm (of NaCl). The recommended level for use in a water system is between 0.5 to 5.0 ppm (of NaCl).
Recommendation: Initially fill the tank with distilled/deionized water. Do not
use untreated tap water as the total ionized solids level may be too high.
Maintain this water quality at a resistivity of between 1 to 10 MOhmcm
(compensated to 25°C) by using a purification system. Although the initial fill
may be as high as 18 MOhmcm (compensated to 25°C), the desired level for
long time usage is 1 to 3 MOhmcm (compensated to 25°C).
The above two recommendations will reduce the electrolytic potential of the
water and prevent or reduce the galvanic corrosion observed.
- 28 -
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