MECHELECTRIC DIGISTAT 3 User manual

DIGISTAT 3 ON / OFF TEMPERATURE CONTROLLER
A simple to install, configure and use
Digital temperature controller housed
within an IP66 weatherproof enclosure
for general purpose applications indoors
or for outdoors.
For 230v / 1 phase / 50Hz operation.
Maximum Direct Switching: 10 Amps /
2kW (resistive) loads.
Supplied with 2m probe, in & out power
cable sealing glands for flexible cables up
to 7mm diameter (e.g. 1.25mm csa).
Alternative gland types / sizes available.
Also available, a range of add on relay
and contactor units for higher loads,
including 3 phase applications.
The DIGISTAT 3 is configurable for either HEATING or COOLING applications such as electrical space
heaters, coolers, refrigeration, duct heaters, fan systems, air handling units, trace heating etc.
MECHELECTRIC SERVICES www.mechelectric-services.co.uk Tel: [phone]

DIGISTAT 3 INSTALLATION & USER GUIDE
For surface mounting, remove the 4 (corner) cover retaining screws. Note these screws are held captive
in the transparent lid of the Digistat 3.
Position the enclosure on the surface at chosen location and mark the corner fixings position. The fixings
grid is 110mm x 110mm square. Fix the enclosure. Do NOT overtighten fixings, but ensure a secure
mounting.
Electrical connections. ENSURE THAT ANY EXISTING SUPPLY WIRING IS ISOLATED AND IN A SAFE STATE.
Loosen the two arrowed screws (about ONE turn) which secure the white Terminals coverplate, and
remove it by sliding upwards and away over the screw heads. (A piece of adhesive tape helps to grip the
coverplate to aid removal).
Firstly, install the supplied temperature sensing probe cable through the smaller cable gland and
connect to the green terminal block. The probe is NOT polarity sensitive and may be connected either
way round.
Install the flexible cable leading to the controlled load via the centre
cable gland and connect to the right hand grey terminal block
marked “LOAD OUT”. Live (Brown) to L, Neutral (Blue) to N, Earth
(Green/Yellow) to E.
Next, install the supply cable via the left hand cable gland and
connect to the left hand grey terminal block marked “MAINS IN”.
Live (Brown) to L, Neutral (Blue) to N, Earth (Green/Yellow) to E.
Ensure all electrical connections are secure, and replace the
Terminals Coverplate and gently retighten the arrowed screws.
The Digistat 3 is now ready for setting up and use.
On power up the display may illuminate immediately. If not, press the ‘Display ON/OFF’ button to start
the display.
Setting Up (Programming).
The Digistat 3 is very straightforward to configure to your requirements; the three yellow buttons to the
left of the display are used.
Simple operation: A short press on ‘SET/ENTER’ will cause the lower (blue) setpoint value to flash, and
can be adjusted by the ‘UP’ or ‘DOWN’ buttons to select the required setpoint (operating) temperature.
A second short press on ‘SET/ENTER’ stores the new value and the unit is now in normal operation.
Advanced operation: A long press on ‘SET/ENTER’ allows access to advanced programming as seen in the
Set Up / Programming table. Use ‘UP’ or ‘DOWN’ buttons to select programme number to modify (P0 –
P8 on the red display), a short press on ‘SET/ENTER’ button causes the current (blue) value to flash
which can now be modified with the ‘UP’ or ‘DOWN’ buttons. After selecting a new value, wait 3
seconds for the change to be stored and the unit reverts to operational mode. Repeat the procedure for
each required programme alteration.

Advanced Programming Table
The following table shows the functions that are user configurable. HOWEVER, the Digistat 3 is shipped
set up as per the table.
Prog No. /
Code
Function
Range/Options
Default
P0
Heat / Cool mode
H / C
H
P1
Hysteresis
0.1°C - 30.0°C (0.1°F - 54°F)
0.5°C (0.5°F) See NOTE 1
P2
Set Upper limit
-55°C - 120°C (67°F - 248°F)
120°C (248°F)
P3
Set Lower limit
-55°C - 120°C (67°F - 248°F)
-55°C (-67F)
P4
Calibration Offset
-10°C - +°C (-27F - +27F)
0°C (0°F) See NOTE 2
P5
Delay on START
0 - 10 minutes
0 minutes
P6
Alarm
temperature
-55°C - +120°C (-67°F - +248°F)
120°C (248°F)
P7
Temerature UNIT
°C / °F
°C
P8
Data Lock
ON / OFF
OFF
On request we can pre-programme to your requirements prior to shipping.
NOTE 1:
Hysteresis is the temperature differential between the controller ON and OFF states.
In HEATING mode, hysteresis is NEGATIVE, i.e. the controller will activate at SETPOINT –HYSTERESIS.
Example: If Setpoint = 20°C and Hysteresis = 0.5°C, the controller switches ON heating at 19.5°C, and
OFF at 20°C.
In COOLING mode, hysteresis is POSITIVE, i.e. the controller will activate at SETPOINT + HYSTERESIS.
Example: If Setpoint = 20°C and Hytseresis = 0.5°C, the controller switches ON cooling at 20.5°C, and OFF
at 20°C.
NOTE 2:
Calibration Offset is adjusted to match the supplied probe to the controller. (There is sometimes slight
variation between different probes).
We configure Calibration Offset to the probe being supplied with the Digistat 3 by comparison with our
Reference Thermometer at a known temperature PRIOR to shipping.
A copy of the Advanced Programming Table is included with the shipment indicating actual Calibration
Offset as well as any other customer specified programming.
DIGISTAT 3 specifications
Working voltage: 200 –250v ac single phase.
Maximum direct switching current: 10 Amps.
Working temperature range: -50°C –120°C
Resolution: 0.1°C
Dimensions (Enclosure): 125mm x 125mm x 75mm.
Weight (excluding probe): 500 grams.
Ingress Protection: IP66 (with equally rated cable entry glands).

Accessories for the DIGISTAT 3
A range of matching POWER RELAY and CONTACTOR and SOLID STATE RELAY modules for the
controlling of high power loads (including 3 phase) are available.
(Can include MCB or RCD circuit protection)
A range of LOAD SPLITTER modules for connection of multiple loads to a single DIGISTAT 3 are available.
(Can include MCB or RCD circuit protection).
Trace Heating cables for frost protection, horticultural applications etc.
Indicating Circuit End (ICEbox) terminations for trace heating installations to give visual indication of
circuit activation remote from controller.
Versions can be supplied with alternative cable glands and sizes for specific applications.
ALL products are subject to continuous improvement, and our range of Control, Measurement and
Diagnostic units is continually expanding.
MECHELECTRIC SERVICES
UNIT 3, PENTIRE WORKSHOPS
DELABOLE
CORNWALL.
PL33 9AH
Tel: [phone] email: [e-mail] www.mechelectric-services.co.uk
Copyright: MECHELECTRIC SERVICES Digistat 3 Version 1; 11.12.2021
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