CNIS843 i-Series Program. Strain/Process Controllers & Meters with Comm.
1/32 DIN Models iS32, Strain and Process Meters and Controllers
Supported Applications
The Omega i-Series is a family of microprocessor-based instruments designed for strain and process measurement. The series includes digital panel meters (DPI) and single loop PID controllers (CNI) configured with universal inputs to accept signals from load cells, pressure transducers, and strain gage sensors. These units also support standard temperature and process voltage/current ranges.
Key applications documented for the i-Series include:
• Strain Measurement: Monitoring of load cells, pressure transducers, and strain gages using ratiometric mode.
• Process Control: Heat/cool control, alarm monitoring, and ramp-to-setpoint operations for temperature and process variables.
Operating Conditions & Performance
The i-Series operates within an ambient temperature range of 0 to 55°C (32 to 131°F) with a humidity rating of up to 90% RH non-condensing. The instruments feature front bezel ratings of NEMA 4 (IP65) or NEMA 1/Type 1, depending on the configuration.
Performance specifications for strain and process inputs include:
• Accuracy: ±0.03% rdg ±0.03% range for process and strain measurements.
• Resolution: 10/1 μV for strain/process applications; 1°/0.1° or 10 μV for temperature/process inputs.
• Response Time: 0.7 sec for 99.9% of the final value.
The series supports built-in excitation options including 24 Vdc @ 25 mA, 5 Vdc @ 40 mA, and 10 Vdc @ 60 mA to power connected sensors directly.
Configuration Options
The i-Series is offered in three true DIN sizes: 1/8 (i/8), 1/16 (i/16), and 1/32 (i/32). The series supports a wide range of configurable outputs, communications, and power options to meet specific installation needs.
Output Configurations:
• 0.5 A SSR
• Relay
• DC pulse
• Analog output (Isolated Analog Voltage and Current)
• Ethernet with embedded Web server (-EIT suffix)
• Isolated RS232 and RS485/422 serial communications (-C24, -C4EIT suffixes)
Housing & Display Options:
• Dual display models (DH/DV series) for simultaneous process variable and setpoint viewing.
• Compact depth options (-C suffix).
• NEMA 4 (IP65) front bezel protection available on select sizes.
Power Supply:
AC Powered: 90 to 240 Vac ±10%, 50 to 400 Hz; or 110 to 375 Vdc equivalent voltage.
DC Powered (-DC suffix): 12 to 36 Vdc, 24 Vac (or 20 to 36 Vdc for dual display/Ethernet/analog output options).
Special Features:
Ratiometric mode specifically for strain gages.
Programmable digital filter.
Limited alarm versions (-AL suffix) and simplified menu control (-SM suffix).
Key Product Differences
The i-Series distinguishes between standard temperature/process models (CNI series) and strain-specific configurations. Strain gage inputs are identified by the "S" in the model number, such as CNIS32xx or CNIS8xx.
• Model Numbering: The general format is CNI<Size><Model><Suffix>. For example, a 1/32 DIN strain meter with relay outputs might be designated CNIS3244. Strain models (CNIS) are distinct from standard temperature/process controllers.
• Suffix Constraints: The "-SM" simplified menu option is not available on CNIS strain models. Ethernet options (-EIT, -C4EIT) are unavailable for CNI8A, CNI8C, CNI16, CNI16A, and CNI32 controllers.
• Power & Excitation: The "-DC", "-C24", and "-C4EIT" options are not available with built-in excitation. Analog output is incompatible with the "-AL" limit alarm version.
| Accuracy | ± 0.03 % |
| Analog-to-Digital Technique | Dual slope |
| CMRR | 120 dB |
| Display Note | 4-digit 9-segment LED 10.2 mm (0.40"); i32, i16, i16D, i8DV 21 mm (0.83"); i8 10.2 mm (0.40") and 21 mm (0.83"); i8DH RED, GREEN, and AMBER programmable colors for process variable, setpoint and temperature units |
| Display Type | LED |
| Electrical Connection | Screw Terminal |
| Enclosure Ratings | IP65, NEMA Type 4, NEMA Type 4X |
| Impedance Input | 10 MΩ for 100 mV;1 MΩ for 1V or 10 Vdc |
| Input Range Note | 0 to 100 mVdc,-100 mVdc to 1 Vdc, 0 to 10 Vdc, 0 to 20 mA |
| Input Type | Single Ended, Voltage, Current, Strain, Temperature |
| Isolation | Power to Input/Output: 2300 Vac per 1 minute test For Low Voltage Power Option: 1500 Vac per 1 minute test Power to Relay/SSR Output: 2300 Vac per 1 minute test Relay/SSR to Relay/SSR Output: 2300 Vac per 1 minute test RS232/485 to Input/Output: 500 Vac per 1 minute test |
| Length | 5 in |
| Linearization Points | Up to 10 |
| Measurement Type | Current, Strain, Temperature, Voltage |
| NMRR | 60 dB |
| Number of Digits | 4 |
| Number of Inputs | 5 |
| Offset Adjustment | -1999 to 9999 |
| Operating Temperature, Max | 55 °C |
| Operating Temperature, Min | 0 °C |
| Polarity | Unipolar |
| Reading Rate | 3/sec |
| Relative Humidity | 90% RH non-condensing |
| Resolution | 10/1µV |
| RTD Type | 100/500/1000 Ω Pt |
| Sampling Rate | 3 Hz (3 updates/second) |
| Sensor Excitation | 24 Vdc @ 25 mA (not available for low-power option) |
| Series ID | i-Series-Strain |
| Set Point Adjustment | Menu Configurable |
| Step Response | 0.7 s for 99.9% |
| Temperature Stability | 50 ppm/°C |
| Thermocouple Type | J, K, T, E, N, R, S, B, C, L |
| Weight | 127 g |