Page ST325 User Handbook
24
Further copies of this handbook may be found at www.staffordinstruments.co.uk/docs/st32x/user325.pdf
Program No:
Segment
No.
Ramp
Rate
°C/hr
Soak
Temp
°C
Soak
Time
hr.min
Notes
Please photocopy me!
Please photocopy me!
ST325 User Handbook Page
1
ST325
User Handbook
ST325 Temperature Programmer
TAFFOR
S
D
Stafford Instruments Ltd.
Tel: +44(0)1785 255588
Fax: +44(0)1785 255589
www.staffordinstruments.co.uk
email: support@stafford-inst.co.uk
Issue: 1.02
Date: 21 Feb 2011
See separate handbook for User Instructions
© Copyright 2011 Stafford Instruments Ltd.
Page ST325 User Handbook
2
MAIN DISPLAY
SEGMENT
MIMIC
DISPLAY
DISPLAY
INDICATORS
CONTROL
KEYS
(6)
At A Glance
SOAK TIME LAMP
SOAK TEMPERATURE LAMP
COOLING
RAMP LAMP
FIRING LAMP
HEATING
RAMP LAMP
POWER
SWITCH
(ON BASE)
EVENT LAMP
PAUSED LAMP
CARD
READER
(ON SIDE)
ST325 User Handbook Page
23
All error messages cause the ST325 to terminate the firing with all the
keys locked. An alarm buzzer sounds once per second.
SWITCH KILN OFF!
To reset the ST325 turn off the power to the instrument and have the fault
investigated and rectified by your installer or kiln service engineer.
Technical note: any error message will cause the alarm relay to open
- see installation handbook for details.
Note: these error messages are provided to detect kiln faults and so
offer some protection to the kiln. For increased protection the use of
a heat fuse or other independent over-temperature trip is recommended - such as the Stafford Instruments ST121.
Error 7. Maximum room temperature
exceeded. The internal temperature of
the ST325 has exceeded an installer
selectable (30 - 70°C) limit.
Err7
°C
°C/hr
hr.min
Possible causes are: room vent fan failure, ventilation grills blocked, kiln room too
small, damper or bung left open.
Error Messages
Page ST325 User Handbook
22
Error Messages
Error Messages
Error 1. The kiln temperature is not
increasing as required. The kiln has been
on full power for 1 hour but the kiln
temperature has not risen by at least 8°C.
Error 2. Thermocouple or thermocouple
wiring open circuit. Get thermocouple and
wiring checked. Have thermocouple
replaced if necessary.
Error 3. Thermocouple reversed (kiln
temperature apparently less than -40°C).
This is an installation fault. Get wiring
checked.
Error 4. Kiln temperature too high. The
kiln has been on zero power for 30
minutes but the kiln temperature has not
fallen by at least 1°C
Err1
°C
°C/hr
hr.min
Err2
°C
°C/hr
hr.min
Err3
°C
°C/hr
hr.min
Err4
°C
°C/hr
hr.min
Possible causes are: kiln door or lid not closed properly, heater element failure,
elements too old, power phase failure, contactor failure or thermocouple shortcircuit.
Error 5. Kiln temperature overshoot. The
kiln temperature exceeds the desired
temperature by at least 10°C - 50°C
(installer selectable).
Err5
°C
°C/hr
hr.min
Error 6. Maximum firing time exceeded.
The length of the current firing has
exceeded an installer selectable (10 - 999
hours) limit.
Err6
°C
°C/hr
hr.min
Possible causes are: contactor failure or thermocouple connection intermittent or
high resistance.
ST325 User Handbook Page
3
Quick Start Guide
Quick Start Guide
Switch on & wait for kiln temperature display
To run a firing program set up previously press
the START/STOP key
To stop the firing at any time press the START/
STOP key again
To review firing data press the ¨ key to enter
the programming menu
To change firing data press the © & ª keys to
change the displayed value
Use the ¨ key again as necessary to index to
the next firing value or segment to be reviewed
or changed
To mark the end of a program set a ramp rate to
End with the ª key
If the keyboard is locked then press the © & ª
keys together & hold down for 5 seconds to
unlock
To exit the programming menu either wait 10
seconds or press the START/STOP key to start
firing
Page ST325 User Handbook
4
Contents
Contents
At a Glance .......................................................................................... 2
Quick Start Guide................................................................................. 3
Contents............................................................................................... 4
Features ............................................................................................... 4
Turning On ........................................................................................... 5
Programming..................................................................................... 6-8
Sample Ceramics Programs ................................................................ 9
Temperature Display .......................................................................... 10
Firing .................................................................................................. 11
Sample Glass Programs ............................................................... 12-13
Cooling ............................................................................................... 14
Operating Notes ................................................................................. 15
Adjusting While Firing.................................................................... 16-17
Other Features ................................................................................... 18
Card Reader....................................................................................... 19
Control Relay ................................................................................ 19-21
Error Messages............................................................................. 22-23
Program Record Sheet....................................................................... 24
• Multi-zone
• 32 programs each with up to 32 segments
• 1 controlled heating / cooling ramp + soak per segment
• Soak times up to nearly 100 hours
• Ramp rates from 1 to 999°C/hour + full
• Ideal for glass or ceramics use
• Programs can be altered while firing
• Program pause + segment advance facilities
• Event / Damper Relay Output
• Keyboard lockable
• Delayed start facility - up to nearly 100 hours
• Power failure recovery
• Info key for energy used & set point display
• Alarm Buzzer & Alarm Relay Output
• Mains power switch
• Micro-SD memory card reader
Features
Features
ST325 User Handbook Page
21
FAn.1
°C
°C/hr
hr.min
200
°C
°C/hr
hr.min
FAn.0
°C
°C/hr
hr.min
700
°C
°C/hr
hr.min
At the start of the firing the fan remains off while the kiln temperature is
below the fan start temperature. The fan starts when the kiln temperature
has risen to the fan start temperature and remains on until the kiln temperature has risen to the fan stop temperature. The fan then turns off and
stays off until the end of the program.
The instrument will now reset and the new fan control temperatures will
be stored.
Note: in the sequence above it is important that the
¨
key is
pressed a total of 4 times else configuration changes will not be
saved.
Fan Operation
Fan Output
To enter damper temperature configuration mode press and hold down
the
§ & ¨ keys at the same time while the controller is not running a
program (FIRING LAMP not lit).
Note: in the sequence below if no key presses are detected within
15 seconds the instrument will exit configuration mode and configuration changes will not be saved.
The fan start temperature prompt is
shown. Release the
§ & ¨keys.
Press the ¨ key.
The fan start temperature is now shown.
Adjust with the
© & ª keys (hold down
for acceleration).
Press the ¨ key.
The fan stop temperature prompt is now
shown.
Press the
¨ key.
The fan stop temperature is now shown.
Adjust with the
© & ª keys (hold down
for acceleration)
Press the
¨ key.
Control Relay
Page ST325 User Handbook
20
To enter damper temperature configuration mode press and hold down
the
§ & ¨ keys at the same time while the controller is not running a
program (FIRING LAMP not lit).
Note: in the sequence below if no key presses are detected within
15 seconds the instrument will exit configuration mode and configuration changes will not be saved.
dPr.C
°C
°C/hr
hr.min
The damper close temperature prompt is
shown. Release the
§ & ¨keys.
Press the ¨ key.
150
°C
°C/hr
hr.min
The damper close temperature is now
shown. Adjust with the
© & ª keys
(hold down for acceleration).
Press the ¨ key.
dPr.0
°C
°C/hr
hr.min
The damper open temperature prompt is
now shown.
Press the
¨ key.
500
°C
°C/hr
hr.min
The damper open temperature is now
shown. Adjust with the
©& ª keys
(hold down for acceleration)
Press the
¨ key.
The instrument will now reset and the new damper control temperatures
will be stored.
Note: in the sequence above it is important that the
¨
key is pressed
a total of 4 times else configuration changes will not be saved.
Damper Output
Damper Operation
Prior to firing the damper will be open. During firing, when the kiln reaches
the damper close temperature, the damper will closed.
At the end of the firing and when the kiln has cooled naturally to the
damper open temperature, the damper will open.
Control Relay
ST325 User Handbook Page
5
Turning On
tC.r tC.S
tC.n tC.K
When turned on the ST325 performs
a display test by briefly illuminating all
of the display digits and all of the front
panel lamps.
The version number of the embedded
software is now displayed. If you
need technical support you may be
asked for this code together with the
ST325’s serial number.
Next displayed is the thermocouple type to which the ST325 is set. This
thermocouple type setting should match the type of thermocouple fitted to
the kiln and can be R, S, K or N type.
‘R’ type
thermocouple
‘S’ type
thermocouple
‘K’ type
thermocouple
‘N’ type
thermocouple
20
°C
°C/hr
hr.min
. 20
°C
°C/hr
hr.min
20.
°C
°C/hr
hr.min
The final display should show the kiln
temperature (20°C shown here) with
the ‘°C’ indicator on. All other lamps
should be off.
If the left-hand decimal point is on
then the keyboard is locked. This is
an anti-tamper feature. Press the ©
& ª keys together & hold down for 5
seconds to unlock.
If any mimic panel lamps are on then
the ST325 is firing. Press the
START/STOP key to stop the firing.
During firing the right-hand decimal
point will light to show when the kiln
is heating.
Turning On
8888
°C
°C/hr
hr.min
F1.01
°C
°C/hr
hr.min
Turn on the mains supply to the controller using the switch on the base.
Page ST325 User Handbook
6
Programming
A firing segment
An ST325 firing segment comprises a ramp followed by a soak period.
Two segments can be used for simple firing (bisque firing for example)
or up to 32 segments can be used per program for complex firing
(crystal glazing or glass-making for example).
The ST325 ramps the kiln temperature at the required ramp rate until
the kiln reaches the soak temperature. It then soaks (dwells) at the
soak temperature for the soak time. It then runs subsequent segments until the end of the program is reached.
The ST325 is capable of both positive (heating) ramps and negative
(cooling) ramps - as used in glassmaking for annealing. The type of
ramp is clearly shown on the mimic display during firing.
The ramp rate is settable in the range 1°C/hour to 999°C/hour or FULL
(full power) or End (end of program).
The soak temperature is settable over the range 0 to 1320°C.
The soak time is settable over the range 00.00 (no soak) to 99 hours
59 mins.
Note: during soaking the ST325 display alternates every 15
seconds between kiln temperature and soak time remaining.
Programming
soak temperature
heating ramp
cooling ramp
soak period
ST325 User Handbook Page
19
Control Relay
Control Relay Configuration
100
°C
°C/hr
hr.min
While displaying a ramp rate the event
relay can be switched on or off by holding in the f
n (function) key then pressing
the (event) key. The event relay will
be closed when the event lamp is on.
The ST325 has a relay output that can be configured (see installation instructions)
as not used, a damper control output, a fan control output or an event output.
00.15
°C
°C/hr
hr.min
While displaying a soak time the event
relay can be switched on or off by holding in the f
n (function) key then pressing
the (event) key. The event relay will
be closed when the event lamp is on.
Control Relay
Event Output
Card Reader
This controller has a card slot for a micro SD memory card (the same type of card as used on many
mobile phones). The card can only be inserted one
way around with the gold contacts facing away from
you (towards the back of the controller).
Card Reader
Card files can also be used to update the operating
firmware (software) of the controller if necessary for
bug fixes or to add extra features or options.
Files on the card can be used to modify the
configuration of the controller.
You could request a pre-programmed card be sent through the post. Alternatively
the files may be sent via email or downloaded from our website and then copied on
to a suitable card. The controller has been tested with several makes of 1G & 2G
micro-SD cards. Suitable cards are available from Stafford Instruments.
Note: to copy files to the card your computer will need either an SD memory card
slot or a USB card programmer. You may also need an SD to micro-SD card
adapter (often sold with the micro-SD card). Your computer will recognise the card
as a removable disk. The files should reside in the root directory of the card/disk.
Only FAT16 is supported.
To update the controller first turn it off. Insert the card into the controller’s slot.
Press and hold down the green f
n key while turning the controller on. The °C, °C/hr
& hr.min lamps will now flash showing an update is in progress. Release the f
n key.
Wait for the update to finish (might take up to 2 minutes) then remove the card.
Page ST325 User Handbook
18
Other Features
Other Features
Info Key
Hold down the green fn key and then press the i key to display the energy
used in kW hours. If pressed during a firing it shows the energy used so
far. After a firing it shows the total energy used for that firing. This information is stored while power is off and is only reset to zero when a new
firing is started. If the value displayed is always 0.0 then the kiln power
rating has not been configured into the ST325 - see installation handbook.
Keeping the green f
n key pressed down, press the i key again to display
the current set point (target temperature).
Keyboard Lock Facility
1.200
°C
°C/hr
hr.min
The keys on the ST325 can be locked so that pressing them has no effect.
This is an anti-tamper feature used to ensure that the operation of the
ST325 or the program data cannot be altered by un-authorised people.
The ST325 can be locked when it is idle (not firing) or while it is firing. It
cannot be locked while it is being programmed.
If the left-hand decimal point in the
display is lit then the ST325 is locked.
Press and hold in both the © & ª
keys for 5 seconds to unlock the
ST325.
1200
°C
°C/hr
hr.min
If the left-hand decimal point in the
display is not lit then the ST325 is not
locked. Press and hold in both the ©
& ª keys for 5 seconds to lock the
ST325.
Power Failure Recovery
If power fails during firing then the ST325 recovers as follows:For power failure during start delay then by default the ST325 times off the
remaining start delay when power returns (configurable - can be set to fire
immediately when power returns - see installation manual).
For power failure during ramping the ST325 continues the ramp it was previously executing.
For power failure during soaking the ST325 ramps back up to soak temperature at the correct ramp rate then applies the remaining soak period.
Power failure recovery can be disabled if required (see installation handbook) - the ST325 will then lock up with FAIL displayed and kiln off in the
event of power failure.
ST325 User Handbook Page
7
When not firing no lamps lit on the mimic panel, the firing lamp is off
and the display shows the kiln temperature with the °C indicator lit.
Segment 1 is displayed.
Changing / entering a program
. 20
°C
°C/hr
hr.min
If the left-hand decimal point is on then the
keyboard is locked. Press the © & ª keys
together & hold down for 5 seconds to
unlock.
Note: holding down the © or ª keys causes rapid change of the
displayed value.
150
°C
°C/hr
hr.min
¨ then displays the ramp rate in the range
1 to 999°C/hr or FULL or End. This can be
altered with the © & ª keys. The
HEATING RAMP or COOLING RAMP
lamp on the mimic display will flash.
600
°C
°C/hr
hr.min
¨ then displays the soak temperature in
the range 0 to 1320°C. This can be altered
with the © & ª keys. The SOAK
TEMPERATURE lamp on the mimic
display will flash.
Programming
00.15
°C
°C/hr
hr.min
The next push of the ¨ key displays the
soak time in the range 00.00 to 99.59 (99
hours 59 mins). This can be altered with
the © & ª keys. The SOAK TIME lamp on
the mimic display will flash.
A further push of the ¨ key increments the segment display digit and
firing data for the next segment can be entered. Continue
programming susequent segments as required.
Pr.12
°C
°C/hr
hr.min
1
Press the ¨ key to display the currently
selected (flashing) program number. This
can be changed as required with the © &
ª keys. There are 32 programs available.
End
°C
°C/hr
hr.min
Data entry is terminated if End is selected
for a ramp rate with the ª key. Data entry
is also automatically terminated if 32
segments have been entered.
2
Page ST325 User Handbook
8
To exit programming mode at any time wait 10 seconds without
pressing any keys - the ST325 will then revert to the idle display.
Alternatively press the START/STOP key to exit programming and to
begin firing immediately.
The
§
key can be used to reverse through the programming steps to
correct errors or to exit programming mode.
Available ramp rate displays are: End, 1 … 999
& FULL. If End is
shown but another segment is required then push the © key to obtain
the required ramp rate (in the range 1°C/hr to 999°C/hr). If full power
is required then push the © key until FULL is displayed.
Programming Notes
Programming
To declare the end of a program while prompted for a ramp rate push
the ª key until End is displayed.
FAQ (Frequently Asked Questions)
During programming the COOLING lamp sometimes flashes when I want the
kiln to heat - why is this?
The ST325 asks you to input the ramp rate before
it asks for the soak
temperature so if the (still to be set) soak temperature in the current segment is
less than the soak temperature in the previous segment the ST325 will assume
cooling is required. This anomaly will be rectified when all of the program has
been entered. This can be confirmed by stepping through the completed
program with the ¨ key.
Q:
A:
During programming the HEATING lamp sometimes flashes when I want the
kiln to cool - why is this?
The ST325 asks you to input the ramp rate before
it asks for the soak
temperature so if the (still to be set) soak temperature in the current segment is
more than the soak temperature in the previous segment the ST325 will
assume heating is required. This anomaly will be rectified when all of the
program has been entered. This can be confirmed by stepping through the
completed program with the ¨ key.
Q:
A:
During programming End is displayed when I want to enter another segment why is this?
Available ramp rate displays are: End, 1 … 999
& FULL. If End is shown but
another segment is required then push the © key to obtain the required ramp
rate (in the range 1°C/hr to 999°C/hr). If full power is required then push the ©
key until FULL
is displayed.
Q:
A:
How do I declare the end of the program?
Press the ¨ key to advance to the next segment. Push the ª key until End
is
displayed. (Press the ¨ key again to exit programming mode).
Q:
A:
ST325 User Handbook Page
17
Program Pause Facility
While firing press and hold down the green fn (function) key then press the
▌▐ (pause) key. The ST325 will pause the executing program. To unpause the program repeat the above key press sequence. The effects of
pausing are as follows:-
If paused during ramping the kiln temperature will be held (soaked) indefi-
nitely at the current kiln temperature. The ramp will continue when unpause is selected.
If paused during soaking then the soak time will be extended indefinitely.
The remainder of the soak period will be resumed when un-pause is selected.
Segment advance ►►can also be used to terminate the pause. This will
advance the segment and will immediately terminate a paused soak - advancing to the next segment (if any).
Changes made to the operation of the ST325 in this way are temporary
and are not stored.
600
°C
°C/hr
hr.min
As a warning during pause a double
beep is sounded every 10 seconds
and the display scrolls PAUSed. The
PAUSED lamp to the bottom left of
the main display is lit.
Adjusting While Firing
WARNING - PROGRAM PAUSE
The program pause facility should be used with care. Program
execution is suspended and the kiln will be held at its current
temperature indefinitely.
If left too long at high temperatures kiln damage could result.
Page ST325 User Handbook
16
Adjusting While Firing
Firing values can be adjusted while the ST325 is firing. Also there are program pause/un-pause and segment advance features that are particulary
useful for glass work.
Adjusting Firing Values
While firing operate the ¨ key to select the required parameter as shown
by a flashing lamp on the mimic display. The firing value is shown on the
main display and can now be adjusted with the © & ª keys in the usual
way. The contents of the current segment or any segment still to be
executed can be changed. Firing will still carry on as normal while these
changes are being made. The ST325 will return to its normal running
display 10 seconds after key presses cease (or immediately after End is
displayed).
Changes made to programs in this way are stored and are used for
subsequent firings.
Segment Advance Facility
While firing press and hold down the green fn (function) key then press the
►► (advance) key. The ST325 will sound a short beep and the executing
program will immediately advance one step as indicated by lamps on the
mimic panel. The effect of this is as follows:-
If a start delay is currently executing then the ST325 will terminate this and
start firing immediately.
If ramping is currently executing then the ST325 will switch to soak at the
current kiln temperature.
If currently soaking then the ST325 will advance to the next segment if any,
or else it will end the firing.
Changes made to the operation of the ST325 in this way are temporary
and are not stored.
Adjusting While Firing
ST325 User Handbook Page
9
Sample Ceramics Programs
Sample Ceramics Programs
Note
It has been found that a kiln controller will give greater heat work as the temperature
increases. Therefore to achieve a stoneware firing of cone 8-9 we suggest setting
the final soak temperature to 1235°C. A slight adjustment can then be made after
the first firing. It should be remembered that kiln controllers are indicators of
temperature and the effects of faster or slower firings may cause extreme variations
in the end result. This is known within ceramics as “heatwork”. Cones are
measures of heatwork and it is strongly recommended that cones are always used
in conjunction with a kiln controller to appreciate the differences between heatwork
and temperature indicated by the controller. Stoneware firings will also demonstrate
the greatest potential differences between heatwork and indicated temperature.
All of the information on this page was kindly provided by Reg Griggs
of Clayman Supplies Limited (www.claymansupplies.co.uk).
Program Name Segment 1
Ramp Rate
Segment 1
Soak Temp
Segment 1
Soak Time
Segment 2
Ramp Rate
Segment 2
Soak Temp
Segment 2
Soak Time
Slow Bisque 60°C/hr 600°C 00:00 FULL 1000°C 00:00
Normal Bisque 100°C/hr 600°C 00:00 FULL 1000°C 00:00
High Bisque 100°C/hr 600°C 00:00 FULL 1140°C 00:00
Brush-on
Earthenware Glaze
1000°C (Cone 6)
100°C/hr 300°C 00:00 FULL 1000°C 00:00
Standard
Earthenware Glaze
1100°C
100°C/hr 300°C 00:00 FULL 1100°C 00:00
Earthenware High
Temperature Glaze
1140°C
100°C/hr 300°C 00:00 FULL 1140°C 00:00
Mid-Range
Stoneware Glaze
1200°C
100°C/hr 300°C 00:00 FULL 1200°C 00:00
Standard
Stoneware Glaze
1260°C (see note)
100°C/hr 300°C 00:00 FULL 1235°C 00:00
Onglaze 780°C 100°C/hr 400°C 00:00 FULL 780°C 00:00
Lustre 750°C 100°C/hr 400°C 00:00 FULL 750°C 00:00
Segment 3
Ramp Rate
End
End
End
End
End
End
End
End
End
End
Page ST325 User Handbook
10
Temperature Dispaly
Temperature Display
1020
°C
°C/hr
hr.min
For multi-zone kilns the temperature of
each zone can be displayed. Zone 1 is
displayed by default when the ST325 is
powered on.
Ch 1
°C
°C/hr
hr.min
To check which zone / channel is currently
displayed press the © or ª keys. The
zone temperature will be displayed again
after 5 seconds or if the ¨or § keys are
pressed.
Ch 2
°C
°C/hr
hr.min
To change the displayed zone / channel
press either the © or ª keys again. Ch 1
& Ch 2 will be shown for 2-zone kilns and
Ch 3 will be shown for 3-zone kilns.
1023
°C
°C/hr
hr.min
To display the zone temperature either
wait 5 seconds or press the ¨or § keys.
This section only applies to multi-zone (2 or 3 zones) kilns. A single zone
kiln will always show the temperature of zone 1 only.
ST325 User Handbook Page
15
If the ST325 is programmed to heat the kiln at a faster rate than the kiln is
capable of then the ST325 will turn on full power then wait until the kiln
temperature has risen to the correct temperature before proceeding to the
next ramp or soak segment.
Likewise if the ST325 is programmed to cool the kiln at a faster rate than
the kiln is capable of then the ST325 will apply zero power then wait until
the kiln has cooled to the correct temperature before proceeding to the
next ramp or soak segment.
Kiln too slow
Heating & Cooling Ramps
The ST325 is capable of controlled ramps for both heating and cooling.
The type of ramp required is determined by comparing the required soak
temperature to the soak temperature in the previous segment and is shown
on the mimic display.
STOP key operation
If the START/STOP key is pressed during a firing then the firing will be
halted (not paused). Pressing the START/STOP key again will cause the
ST325 to restart the firing from the beginning. The ST325 will look at the
current kiln temperature and if this is greater than the required soak temperature then the ST325 will automatically cool from current temperature to
the soak temperature. This may not be what is desired so the STOP key
should only be used to halt the firing in an emergency.
The program can be paused or program data can be changed while the
controller is firing (see page 14). This is a better option than using the
STOP key. The segment advance feature (see page 16) is however available to recover quickly from STOP key operation if required.
Memory
All programs & necessary data are remembered when the ST325 is turned
off. In the event of power failure during firing the ST325 will automatically
resume firing when power is returned (this feature can be disabled: see
installation handbook).
Operating Notes
Delayed Start
The delayed start time period is by default set to 00.00 when the ST325 is
turned on. This zeroing feature can be changed to allow a previously entered delayed start time to be remembered: see installation handbook.
Operating Notes
Page ST325 User Handbook
14
Cooling
Upon completion of firing the ST325 lights all lamps on the mimic display and the
kiln is allowed to cool naturally.
120
°C
°C/hr
hr.min
Hot
°C
°C/hr
hr.min
39
°C
°C/hr
hr.min
End
°C
°C/hr
hr.min
While the kiln temperature is above 40°C the display alternates every 5 seconds
between the kiln temperature and Hot
When the kiln has cooled to less than 40°C the display alternates every 5 seconds
between the kiln temperature and End
To return the ST325 back to idle condition ready for the next firing press the START/
STOP key (or turn off the power to the instrument).
Cooling
ST325 User Handbook Page
11
00.00
°C
°C/hr
hr.min
Firing
Information: The ST325 operates by calculating the amount of energy required by the kiln
every 30 seconds. If for example 40% of full energy is required to maintain a particular
ramp rate or a particular soak temperature then the ST325 will apply heating power to the
kiln for 12 seconds every 30 seconds. The right-hand decimal point in the display will
light for 12 seconds every 30 seconds. If the kiln has a contactor then a loud click will be
heard both when the decimal point lights up and when it goes out. If full heating power is
required then the decimal point will remain lit. If full cooling is required then the decimal
point will remain off.
Firing
Hint: it is good practice to check that the program is correct by pressing the ¨
key & checking the program number & program contents before starting a
firing.
20.
°C
°C/hr
hr.min
To start a firing press the START/STOP
key. The start delay time will be displayed.
The FIRING LAMP will flash - prompting
you to change the start delay (using the ©
& ª keys). If the delay is 00.00 the firing
will start in 5 seconds (or immediately if the
STOP/START key is pressed again).
During firing the right-hand decimal point
will periodically light - this shows when
heating power is being applied to the kiln
elements.
620
°C
°C/hr
hr.min
When the kiln has ramped to the programmed soak temperature soaking commences for the programmed soak time.
The display alternates between showing
kiln temperature...
00.14
°C
°C/hr
hr.min
… and showing the soak time remaining.
At the end of the soak period the next required segment will be run. If no more
segments are required the kiln is allowed to cool naturally (see page 14).
Page ST325 User Handbook
12
Sample Glass Programs
Program
No.
Program
Description
Seg 1
Ramp
Rate
°C/hr
Seg 1
Soak
Temp
°C
Seg 1
Soak
Time
hr:mn
Seg
Ra
mRat
°C/
h
1 4-6mm Float Glass Fuse 150 538 00:10 FUL
L
2 4-6mm Float Glass Slump 538 538 00:00 FUL
L
3 6mm Bullseye™ Fuse 204 538 00:00 316
4 6mm Bullseye™ Slump 155 704 00:20 FUL
L
5 6mm Spectrum System 96™ Fuse 200 500 00:00 FUL
L
6 6mm Spectrum System 96™ Slump 155 704 00:20 FUL
L
7 Bottle Firing Cycle 170 510 00:00 250
8 Low Stain 200 570 00:10 FUL
L
9 High Stain 200 665 00:10 FUL
L
The ST325 is provided pre-programmed with the sample
programs shown above which may be modified as required.
These programs were kindly provided by Kilncare Ltd
(www.kilncare.co.uk) and The Creative Glass Guild
(www.creativeglassguild.co.uk).
Sample Glass Programs
ST325 User Handbook Page
13
2
p
e
Seg 2
Soak
Temp
°C
Seg 2
Soak
Time
hr:mn
Seg 3
Ramp
Rate
°C/hr
Seg 3
Soak
Temp
°C
Seg 3
Soak
Time
hr:mn
Seg 4
Ramp
Rate
°C/hr
Seg 4
Soak
Temp
°C
Seg 4
Soak
Time
hr:mn
Seg 5
Ramp
Rate
°C/hr
840 00:20 FULL 538 00:45 182 427 00:15 End
824 00:20 FULL 538 00:15 182 427 00:00 End
794 00:20 FULL 516 01:00 66 371 00:00 End
516 01:30 26 371 00:00 End - - -
804 00:12 FULL 540 00:40 150 510 00:20 End
540 01:30 FULL 510 00:10 26 371 00:00 End
780 00:10 FULL 510 01:00 70 400 00:30 End
516 00:30 100 300 00:00 End - - -
550 00:20 FULL 516 00:30 100 300 00:00 End
Bullseye™ is a registered trademark of the Bullseye Glass
Company (www.bullseyeglass.com).
System 96™ is a registered trademark of the Spectrum Glass
Company Inc (www.system96.com)
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