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SPECIFICATIONS:
Part Number: IS200TRTDH1A
Manufacturer: General Electric
Series: Mark VIe
Number of Channels: 8
RTD types: 10, 100, and 200 platinum
Span: 0.3532 to 4.054 V
Maximum lead resistance: 15 maximum
Operating Temperature Range: 0°C to 60°C
Size: 30.48cm High x 21.33cm
Repair: 3-7 days
Availability: In Stock
Weight: 0.65 kg
Country of Origin: United States
Manual: GEH-6721D
FUNCTIONAL DESCRIPTION:
IS200TRTDH1A is a Resistance Temperature Device Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The TRTD Resistance Temperature Device (RTD) terminal board is designed to accommodate up to 16 three-wire RTD sensor inputs. These inputs are connected through two barrier-type terminal blocks, which offer a secure and organized way to terminate the sensor wires. The board is equipped with integrated noise suppression circuitry that protects the signals from electrical surges and high-frequency noise, ensuring accurate and reliable temperature measurements even in electrically noisy industrial environments. This makes it suitable for use in critical applications where signal integrity is essential.
The TRTD board interfaces with one or more I/O processors, which are responsible for converting the analog RTD signals into digital temperature values. These digital values are then transmitted to the control system or controller for processing, monitoring, or automation purposes. There are four versions of the TRTD terminal board available, each designed to meet specific application requirements or system configurations, offering flexibility and scalability for various industrial setups.
INSTALLATION:
The TRTD terminal board is equipped with two barrier-type terminal blocks that are securely mounted to the board using two screws each. These blocks are specifically designed to accommodate wiring from up to sixteen three-wire RTDs. Each terminal block includes 24 terminals, which are capable of accepting wire sizes up to #12 AWG, allowing for flexible wiring configurations. For enhanced shielding and noise protection, a shield terminal strip connected to chassis ground is installed immediately to the left of each terminal block. This setup helps minimize electrical interference and ensures reliable signal transmission from the RTD sensors.
One of the key variants, TRTDH1B, offers redundant RTD input capability by distributing the same input signals to three VRTD boards located in the R, S, and T control racks. This redundancy increases system reliability and is especially beneficial in critical industrial applications where consistent temperature monitoring is essential. While TRTDH1B shares similar characteristics with TRTDH1C, including environmental tolerance, adherence to electrical codes, resolution of temperature data, and noise suppression, it does not support fast scan functionality. This makes it suitable for applications where redundancy is prioritized over high-speed data acquisition.
OPERATION:
The terminal board energizes each of the 16 RTDs with a 10 mA DC excitation current that is multiplexed—it is switched from sensor to sensor rather than supplied continuously—so the devices can be either grounded or floating without creating current-loop conflicts. Sensors may be installed as far as 300 m (984 ft) from the turbine control cabinet, provided the round-trip cable resistance does not exceed 15 Ω. Inside the I/O processor, an A/D converter samples every RTD and its excitation current at 4 Hz in normal mode and 25 Hz in fast mode, timing the snapshots to the power-line frequency to minimize noise. Firmware then applies table-based linearization for any of 15 selectable RTD curves, flags open- or short-circuited elements by detecting out-of-range readings, and automatically drops a faulty channel from the scan to protect the remaining inputs. Should maintenance restore the wiring, the channel is re-qualified and brought back online automatically after about 20 seconds, or instantly if the operator commands it manually.
Signal integrity is reinforced from the moment the leads enter the cabinet: each channel is shunted to ground through high-frequency decoupling networks that bleed off electromagnetic interference. The multiplexing cadence inside the I/O processor is orchestrated by redundant pacemaker circuits, so losing one cable or even an entire I/O processor does not deprive the controller database of temperature data. In a Mark VI Triple-Modular-Redundant (TMR) configuration, the three VRTD boards in racks R, S, and T read RTDs in a staggered pattern—when rack R excites RTD 3, rack S excites RTD 5, and rack T excites RTD 7, and so forth—guaranteeing that no two boards ever drive the same sensor simultaneously, which would otherwise distort the measurement.
WOC maintains one of the largest inventories of genuine OEM replacement parts for GE Distributed Control Systems, ensuring quick access to critical components to minimize downtime and maintain operational efficiency. In addition to supplying unused, refurbished, and reconditioned boards, each is backed by a reliable warranty. We offer comprehensive repair services for faulty boards to extend their service life. Our expert technical team is available 24/7 to support your OEM requirements, assist with system troubleshooting, and provide guidance on part selection and upgrades. For pricing, availability, or repair service inquiries, please contact us via phone or email.
What is an RTD Terminal Board?
An RTD Terminal Board serves as the crucial interface between RTD sensors and control or monitoring systems. It organizes the wiring connections, ensures proper signal transmission, and provides noise suppression to maintain accurate temperature measurements. This hardware is essential for industrial environments where reliable temperature monitoring is critical.
How many RTDs can be connected to the terminal board?
The terminal board supports up to sixteen three-wire RTD sensors. These inputs connect via two barrier-type terminal blocks, each with multiple terminals designed to securely accept wires up to #12 AWG. This arrangement allows neat, reliable connections for multiple sensors in a single board.
How is the RTD excitation current supplied?
The terminal board supplies a 10 mA DC excitation current to each RTD in a multiplexed manner, meaning the current is switched between sensors rather than continuously applied to all. This approach reduces power consumption and prevents electrical interference between sensors during measurement.
