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 seg-
ments 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 hold-
ing 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 hold-
ing 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 mem-
ory 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.
