CAI-500 Low Cost PID Temperature Controller
2" x 2.5" card mounts
directly to standard solid state relay to
form a complete isolated PID temperature
controller. The CAI-500 can control
100+ Amp loads @ 240/480VAC.
The CAI-500 provides thermocouple isolation
from ground of greater than 2,500V for
demanding applications. Greater then 160dB
50/60 Hz noise rejection provides reliable
operation for high noise, high common mode
voltage applications. Thermocouple inputs
feature cold junction compensation, offset
calibration for correcting sensor
inaccuracies and T/C upscale break
detection. Most thermocouple types (J, K, R,
S, N, T, B are supported).
Thermocouples are linearized to 0.5 º C.
RS-485 Serial link supports
industry standard Modbus communication protocol –
connect up 32 controllers on a 3 wire cable (more
with a repeater). Form a complete multi-channel
control system by daisy-chaining a RS-485 link to a
PC or embedded controller. Baud rates to 115Kbaud.
The on-board watch dog timer for provides unattended
restart for reliable power fail restart operation in
case of an unexpected microprocessor or system
Included software has a PC Windows Demo Program
written in Visual Basic (with source code).
Communicates with any Modbus driver using Hex mode
All parameters stored in permanent EEProm storage.
No batteries are required to prevent loss during
power cycles. Commands to set and read temperature,
setpoint, PID parameters, thermocouple type,
address, maximum power, temperature range, Baud
rate, etc. are stored in the non-volatile EEProm
- Accepts all thermocouple
types – J, K, R, S, N, T, B etc.
- Thermocouples linearized
to 0.5 C
- Full proportional,
integral, derivative (PID) control algorithm
- High accuracy, 16 bit
- High 160dB 50/60 Hz noise
rejection provides reliability for high noise
- 2,500V isolation from
- No calibration required.
Just select thermocouple type and your ready to
- Resolution to less then
0.1 degrees C
- High sample rate – 7
samples per second
- Support for temperature
rise rate control
- Support for power soft
- Built-in watchdog timer
- +12VDC unregulated input
power at 50ma
- Low cost, but high