WOODWARD 9905-970 | LinkNet 6-channel RTD / Analog Input Module

I. Product Description

Brand: WOODWARD (USA), Model: 9905-970, Belonging to LinkNet Distributed IO Series, Original imported acquisition module, compatible with WOODWARD turbine / gas turbine control systems, supports 100Ω platinum resistance RTD temperature measurement + 4-20mA / voltage analog quantity dual types of acquisition, relying on LinkNet fieldbus and speed control main controller networking, collecting temperature, pressure, and rotational speed measurement point signals nearby and uploading to the controller centrally, mostly used for the renovation of old unit control systems and replacement of original factory spare parts.

 Key Technical Parameters Table

Parameter Item  Technical Specification

Power Supply  DC18～32V (nominal 24VDC), total system power consumption ≤ 3.7W

Sampling Channels  6 independent isolated input channels, single channel hardware isolation

Signal Compatibility  100Ω three-wire RTD platinum resistance, 0~5V/1~5V voltage, 4~20mA current signal

Sampling Accuracy  16Bit high-resolution analog conversion, RTD temperature measurement error ≤ ±0.3℃

Communication Bus  Woodward proprietary LinkNet serial bus protocol

Environmental Temperature  -40℃～+70℃, explosion-proof certification Class I Div2 (available in explosion-proof areas)

Dimensions  127×25×203mm, DIN rail cabinet installation

Overall Weight  Approximately 540g, plastic housing industrial protection IP20

Status Indicators  Three-color LED indicators for power, communication, and fault

Product Performance

Automatic compensation for RTD wire resistance in three-wire configuration, long-line laying conditions do not affect temperature measurement accuracy, suitable for long-distance measurement point wiring of the unit;

Single-channel independent electrical isolation, resistant to electromagnetic interference from inverter and large-power excitation equipment, stable collection in harsh environments of thermal power / oil and gas sites;

Modular distributed installation, can be installed nearby power equipment, saving a lot of shielded cable costs;

Self-diagnosis function for faults, automatic alarm for broken wires and short circuits, LED intuitive display of faulty channels, facilitating on-site maintenance;

Full series hardware version Rev.K optimizes anti-interference design, compatible with mainstream speed control main control systems such as Woodward 505/723PLUS.

Application Domains

Thermal Power / Thermal Power Generation: Steam turbine, waste heat power generation steam turbine cylinder temperature, bearing temperature, medium pressure collection;

Oil and Gas Energy: Gas turbine, auxiliary gas power generation unit, self-owned power system of refining and chemical plants temperature and pressure measurement;

Marine Vessels: Ship auxiliary steam generator, diesel generator engine room temperature, lubricating oil parameter monitoring;

Coal Chemicals / Compressor Station: Large reciprocating compressors, gas engine process parameter collection and control.

List of common models in the LinkNet series

9905-970: Standard 6-channel RTD + general-purpose analog model (this model)

9905-970J: Special RTD temperature measurement version, only supports 100Ω platinum resistance input

9905-971: 6-channel switch quantity DI digital input module

9905-972: Relay DO switch quantity output module

9905-973: 4-channel high-speed analog output AO module