GE DS200TBCBG1A DS200TBCBG1AAA Input Terminal Board

The GE DS200TBCBG1A DS200TBCBG1AAA RTD input terminal board connects resistance temperature detectors to Mark V systems. This board conditions and filters RTD signals before analog-to-digital conversion. You will find this terminal board in turbine control cabinets and temperature monitoring panels. Its dedicated design supports three-wire RTDs for lead compensation.

RTD Measurement Architecture

This RTD board provides eight independent input channels for temperature sensors. Consequently, you can monitor multiple bearing and exhaust temperatures simultaneously. The GE DS200TBCBG1A DS200TBCBG1AAA supports 100Ω platinum RTDs with three-wire configuration. Moreover, it includes constant current excitation for each channel. You can connect standard Pt100 sensors without external signal conditioners.

Technical Specifications

Parameter	Value
RTD Inputs	8, three-wire configuration
RTD Type	Pt100 (100Ω at 0°C), alpha = 0.00385
Excitation Current	1 mA constant per channel
Temperature Range	-50°C to +400°C (-58°F to +752°F)
Resolution	0.1°C (0.18°F)
Accuracy	±0.2°C typical, ±0.5°C maximum
Lead Resistance Compensation	Up to 25Ω per lead
Dimensions	230mm x 160mm x 25mm
Weight	0.55 kg (1.21 lbs)
PCB Layers	4
Onboard Components	8 current sources, 8 filters, 8 termination resistors
Connector Count	3 (RTD input, ribbon cable to I/O, ground)
Status Indicators	None (passive termination)
Energy Storage	470 µF (filtering capacitance)
Common Mode Rejection	100 dB at 50/60 Hz
Operating Temperature	-20°C to +60°C
Storage Temperature	-40°C to +85°C

Three-Wire Configuration and Lead Compensation

The unit uses three-wire RTD connections to cancel lead resistance errors. Therefore, long cable runs do not affect temperature measurement accuracy. This board replaces the DS200TBCBG1AAA version without any wiring changes. Simply remove the old board and install this one. GE designed this terminal board for single-slot installation. Hence, it fits directly into existing Mark V rack positions.

Four PCB layers separate RTD signal traces from power and digital lines. Three connectors handle all RTD, backplane, and ground signals. The GE DS200TBCBG1A DS200TBCBG1AAA includes 1 mA constant current sources for each input. Accordingly, it provides stable excitation independent of cable resistance. This feature ensures consistent readings across all eight channels.

Filtering and Installation Guide

The board includes low-pass filters that reject 50/60 Hz noise. These filters prevent interference from AC power lines and motors. The GE DS200TBCBG1A DS200TBCBG1AAA works with all GE Mark V analog input boards. Always use shielded twisted-pair cable for RTD wiring beyond 10 meters. Connect the shield only at the terminal board end for best noise rejection.

Each channel accepts three wires: excitation, sense, and return. Proper wiring polarity ensures correct temperature readings. The GE DS200TBCBG1A DS200TBCBG1AAA simplifies RTD field wiring for turbine systems. Installation requires only a flathead screwdriver for terminal connections. This board operates reliably in non-condensing environments with adequate clearance.