STP321 / STP322 Programmable Thermostat Instruction Manual
Thermosense Limited
T: +44 (0)1628 531166
W: www.thermosense.co.uk
STP321
STP322
Programmable Thermostat
WARNING
Ensure that the electrical power circuit and control output circuit is suitably
protected and fused for your application.
Ensure all electrical connections are secure and checked before any power to the
device is turned on. Failure to connect correctly may cause damage to your
controller or system, electrical shock or fire.
Use this instrument only within the scope of its specification otherwise it may
cause damage to your controller or system, electrical shock or fire.
Do not use this instrument in environments subject to flammable or explosive gas.
Do not touch high voltage terminals, such as power supply terminals. Always
isolate the power supply before attempting any adjustments to the wiring terminals.
Never disassemble, repair or modify this instrument. This will invalidate any
warranty and could lead to damage to your controller or system, electrical shock or
fire.
Technical Data
Dimensions: 75mm x 33mm x 70mm
Sampling time: 2 times/sec.
Mounting: panel-mounted.
Panel cutout: 71mm x 29mm
Multi input: K/J/Pt100/4~20mA
Output:
STP321
, one main output (Relay or SSR drive
– 12Vdc)
STP322
, one main output and one alarm output (3A/250V)
Control method: ON/OFF control
Accuracy: O.5% F.S.
Display: 3 digits 7 segments LED display
Power consumption: 3VA max. (Mod. 230V)
Power supply: 21-30VDC or 110-240VAC (Selected when ordering)
Working environment: 0-50°C
Operating & Storage humidity: less than 80%RH (non-condensing)
Order Code
Please check whether the delivered product is as specified by referring to the
following model code list. Please specify the model code when you place the order.
STP32
OUTPUT
1
One main control output
2
One main control output
and one alarm output
CONTROL ACTION
H
Heating
C
Cooling
OUTPUT
2
Relay output (15A/250V)
5
SSR logic output (12Vdc)
ALARM
N
No Alarm
Alarm active (choose the code - see
Alarm code
)
UNIVERSAL INPUT
Define factory setting of the input
1
K/J
2
PT100
5
4-20mA
8
PT1000
SUPPLEMENTARY POWER
N
No 12\/ output
V
With 12V output
POWER SUPPLY
7
100 to 240Vac
l
21 to 30Vac/dc
Alarm code
A
Deviation high alarm
B
Deviation low alarm
C
Deviation high and low alarm
D
Band alarm
H
Process high alarm
J
Process low alarm
Wire Connection
Front Panel
SET - LED will be
“ON” when the user is changing the set point.
OUT -
LED will be “ON” when the Output Relay / SSR drive is active.
ALM -
LED will be “ON” when the alarm relay is active.
H/C - LED will be lit
RED
when the control action is Heating and
GREEN
when the control action is Cooling.
Exit key
Press this key to exit from parameter setting mode.
"UP" and "DOWN" Keys -
Press the keys to choose the parameters
and set the values. Press the "UP" key to show the software version.
Function key
Press this key 3 seconds to enter set point setting mode.
Press this key 6 seconds to enter parameters setting mode.
Sensor Input Range
PT100
(°C)
Type K
(°C)
Type J
(°C)
Min
-199
-30
-30
Max
+654
+999
+999
1
2
3
4
5
6
7
N.B. When using 4-20mA
Input, use a precision 250 Ω
resistor across terminals 11
and 12 to generate 1-5V input
N.B. For 2 wire RTD, white
lead 10, red lead 12 and link
pin 11 and 12
N.B. When using 4-20mA
Input, use a precision 250 Ω
resistor across terminals 11
and 12 to generate 1-5V input