The temperature and humidity controllers of the iTH Series are available either as indicators
or controllers. The indicators are
extremely accurate programmable
digital panel meters displaying
humidity, temperature, or dew
point. The controllers also provide
single output control for humidity
and temperature and are easily
programmed for any control or
alarming requirement from simple
on-off to full autotune PID control.
The iTH family of meters and controllers are available in four true DIN sizes: the ultra compact 1/32 DIN; the popular midsize 1/16 DIN square model with dual display; the 1/8 DIN vertical, and the 1/8 DIN horizontal with the big bright 21 mm digits.
The iTH Series LED displays can be programmed to change colour between GREEN, AMBER, and RED at any setpoint or alarm point.
The iTH controller models offer a choice of 2 control or alarm outputs in almost any combination: solid state relays (SSR); form “C” SPDT (single pole double throw) relays; pulsed 10 Vdc output for use with an external SSR; or analogue output selectable for control or retransmission of the process value.
The networking and communications options (highly recommended) include direct Ethernet LAN connectivity with an embedded Web server, and serial communications. The C24 serial communications option includes both RS232 and RS485. Protocols include both MODBUS® and a straightforward ASCII protocol. The C4EIT option includes both Ethernet and RS485 ASCII/MODBUS on one device.
The iTH Series meters and controllers are designed for easy integration with popular industrial automation, data acquisition and control programs as well as Microsoft Visual Basic and Excel. Omega provides free configuration software which makes it fast and easy to get up and running. Available for download on the Web.
Action: Reverse (heat) or direct (cool)
Modes: Time and amplitude proportional control modes; selectable manual or auto PID, proportional, proportional with integral, proportional with derivative with anti-reset windup and ON/OFF
Rate: 0 to 399.9 seconds
Reset: 0 to 3999 seconds
Cycle Time: 1 to 199 seconds; set to 0 for ON/OFF operation
Gain: 0.5 to 100% of span; setpoints 1 or 2
Damping: 0000 to 0008
Soak: 00.00 to 99.59 (HH:MM), or OFF
Ramp to Setpoint: 00.00 to 99.59 (HH:MM), or OFF
Autotune: Operator initiated from front panel for 1 input at a time only
There are two physical outputs: Output 1 = RH, Output 2 = Temp
Functions are set up as Outputs (PID or ON/OFF), or Alarms
Ordering output choices:
Relay: 250 Vac @ 3A or 30 Vdc @ 3A (resistive load); Form C SPDT
SSR: 20 to 265 Vac @ 0.05 - 0.5A (resistive load); continuous
DC Pulse: Non-Isolated; 10 Vdc @ 20 mA (used with external SSR)
analogue Output (Output 1 only): Non-Isolated, control or retransmission 0 to 10 Vdc or 0 to 20 mA;
500 ohm max, accuracy is ±1% of FS
Control Output 1 and 2
Action: Reverse (heat) or Direct (cool)
Modes: Time and Amplitude Proportional Control Modes; selectable Manual or Auto PID, Proportional, Proportional with Integral, Proportional with Derivative with Anti-reset Windup and ON/OFF
Alarm 1 and 2 (Programmable)
1) Alarms are used for colour changing sequence of alarm status (visual alarm).
2) Alarm functions are active, in addition to the colour changing functions, if Output 1 & 2 are (menu) disabled.
3) If Alarms are disabled, Output menus (PID or ON/OFF) are active. colour change is still active.
Operation: High/low, above/below, band, latch/unlatch, normally open/normally closed and process/deviation; front panel configurations
-AL Limit Alarm Version: Output 1 & 2 submenus used for PID are eliminated from menu. colour sequence based on alarm setpoints is still available.
Relative Humidity Accuracy/Range: ±2% for 10 to 90%; ±3% for 5 to 10% and 90 to 95% ±4% for 0 to 5% and 95 to 100%
Hysteresis: ±1% RH
±0.5°C for 5° to 45°C (±1°F for 41 to 113°F); up to ±1.5°C for -40° to 5°C and 45° to 124°C (up to ±2.7°F for -40° to 41°F and 113° to 255°F)
Resolution: 0.1%, 12-bit for RH; 0.1°C, 14 bit for temperature
Response Time: 8 seconds, tau 63% for RH; 5 to 30 seconds, tau 63% for temperature
* Note: Extended temperature range is for industrial probe only, the controller’s operating temperature is 0 to 50°C.
Network and Serial Communications (For Options -C24, -C4EIT, -EIT)
Ethernet: Standards compliance IEEE 802.3 10Base-T
Supported Protocols: TCP/IP, ARP, HTTPGET
RS232/RS422/RS485: Selectable from menu; both ASCII and MODBUS protocol selectable from menu; programmable 300 to 19.2 K baud; complete programmable setup capability; program to transmit current display, alarm status, min/max, actual measured input value and status
RS485: Addressable from 0 to 199
Connection: Screw terminals
A/D Conversion: 12-bit RH and 14-bit temp
Reading Rate: 2 samples per sec max
Digital Filter: Programmable
Decimal Selection: None, 0.1 for temp and humidity
Display: 4-digit, 9-segment LED
i32, i16D, i8DV: 10.2 mm
i8: 21 mm
i8DH: 10.2 mm and 21 mm GREEN, AMBER, and RED programmable colours for process variable, setpoint and temp units
Operating Temperature: 0 to 50°C, 90% RH non-condensing
i32, i16D: IP65 (NEMA 4X) front panel
i8DH, i8DV: IP23 (NEMA 1) front panel
Power: Refer to ordering guide
No CE compliance above 60 Hz.
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