K31D

Differential Controller

- Panel mount controller: 78 x 35 mm, depth 75.5 mm
- 2 Configurable probe inputs
- 2 digital inputs
- Absolute or Differential PID or ON/OFF Control

Process inputs:

2 temperature probe inputs

- PTC KTY81-121 (990 Ω @ 25 °C)
- NTC 103AT-2 (10KΩ @ 25 °C)
- PT1000
Overall accuracy: ±(0.5% fs + 1 digit)

2 digital inputs

- Free Voltage

Keyboard

Mechanical: 4 multifunction keys

Process outputs

Up to 4 Digital outputs

OUT1
- RELAY SPDT, 8A
- SSR Drive

- 0/4... 20 mA or 0/2... 10V isolated (power supply 24 VAC/VDC ± 10% only and RS485 not available)
OUT2 
- RELAY SPDT, 8A
- SSR Drive
OUT3/OUT4
- RELAY SPST-NO, 5A
- SSR Drive

Power supply:

- 12 VAC/VDC (not available in case of analogue output 0/4... 20 mA or 0/2... 10V isolated)
- 24VDC/VAC
- 100… 240 VAC (50/60 Hz) (not available in case of analogue output 0/4... 20 mA or 0/2... 10V isolated)
Transmitter power supply: 10 V DC (±10%), 20 mA max.

Functions

- ON/OFF control with neutral zone
- PID single action or double action (Heat/Cool) with overshoot control
- Absolute or Differential Control between the two channels
- Bumpless ramp to set point change
- Start-up delay

Autotuning

- Adaptive Autotuning
- Oscillatory
- Fast

Alarms

- Up to 3 configurable alarms + loop break alarm

Communication and programming:

Interfaces

Communication on TTL port to: 
- Universal programming key
- Remote display
- RS 485 serial interface (not available in case of analogue output 0/4... 20 mA or 0/2... 10V isolated)
RS 485 port with ModBus RTU protocol (optional)

Programming/configuration tools:

- Configurable parameter level “Promotion”
- Configuration software available for PC

Installation

Mounting method: panel mount
Case dimensions: 78 x 35 mm, depth 75.5 mm

Connections

Communication port connection
5 Pole TTL Port
Signals connection
24 poles 2.5 mm² screw terminals block
Front protection: IP65 front frame protection, with screw brakets (optional)

Display and indicators

1 display line, 4 digit, h: 12 mm, red colour
3 LED Bargraph

Connectable to:

- Programming key A01 for PC connection, backup and other functions
- SCADA for monitoring, traceability and remote management
- DX and DY gateways for remote monitoring

Used for:

- Liquid coolers (chillers)
- Natural air-conditioning systems through the recirculation of air
- Heating by solar panels
- Many other applications where two temperature readings are needed

UL Recognition Canada USA

File no. E206847
Ref. UL 873 - CSA C22.2