I. Basic Information

Model: CFP-RTD-122 (cFP-RTD-122)

Manufacturer: National Instruments (NI)

Series: Compact FieldPoint (cFP)

Status: Obsolete

Location: High-precision 8-channel temperature/resistance acquisition, compatible with industrial platinum resistance

Part Number: 777318-12

II. Core Specifications (Channels / Electrical)

Number of channels: 8 single-ended inputs (supporting 2/3-wire RTD)

RTD type: Pt100 (100Ω), Pt1000 (1000Ω) platinum resistance

TCR (α): Built-in 6 linearizations (3850/3902/3916/3928/3981/4280 ppm/°C)

Measurement range:

Temperature: -200 °C ~ +850 °C (Pt100)

Resistance: 0–400 Ω / 0–4000 Ω (direct resistance measurement)

Resolution: 16 bits (0.015 Ω @ 400Ω range)

Excitation current: 0.25 mA pulse constant current per channel

Compensation method: True 3-wire compensation (eliminating lead resistance error)

Filtering: 50/60 Hz noise suppression (common mode / differential mode)

Isolation: 2300 Vrms transient overvoltage protection (channel - backplane)

Accuracy: ±0.05 °C (typical, Pt100 @ 25 °C)

Update rate: 10 Hz (all channels)

III. Wiring and Base

Required base: CFP-CB-1 (36-pin terminal block)

Wiring terminals (per channel):

EX+: Excitation positive

SENSE: Measurement end

COM: Common end

RTD wiring compatibility:

3-wire: EX+, SENSE, COM (recommended, highest accuracy)

2-wire: SENSE and COM shorted

4-wire: Optional 3-wire connection, remaining 1 wire open

IV. Mechanical and Environment

Size: 127 × 66 × 24 mm (standard cFP module)

Weight: Approximately 180 g

Installation: cFP-BP-4 / BP-8 backplane, hot pluggable (HotPnP)

Operating temperature: -40 °C ~ +70 °C

Storage temperature: -55 °C ~ +85 °C

Humidity: 10%–90% RH, no condensation

V. Compatibility

Backplane: cFP-BP-4 (4 slots), cFP-BP-8 (8 slots)

Controller: cFP-180x / 2000 / 2100 series

Software: LabVIEW, FieldPoint Explorer, Modbus RTU/TCP

VI. End-of-Production Replacement (Direct Replacement)

Recommended replacement: NI-9217 (C series, 8-channel RTD, 3-wire, 16-bit, isolated, direct replacement)

Base replacement: NI-9923 (C series universal terminal block)

VII. Typical Applications

Industrial furnaces, oven temperature monitoring

Pt100/Pt1000 temperature measurement in pipelines / tank bodies

High-precision resistance sensor acquisition

Environmental and equipment temperature monitoring system