GE Fanuc DS3820TIMC1A1A | Universal Temp Board | Fast Ship

Description

Product Introduction

The GE DS3820TIMC1A1A is the ultimate universal temperature input module for the Speedtronic Mark V turbine control system, combining support for thermocouples, RTDs, and 4-20 mA transmitters with conformal-coated PCB protection and gold-plated terminals for the most demanding harsh-environment applications. This board mounts directly into the Mark V rack and interfaces with the backplane, converting temperature sensor signals into accurate digital readings for the CPU.

The suffix “1A1A” adds conformal coating (first “1A”) and gold-plated terminals (second “1A”) to the already versatile TIMC platform, which supports J, K, and T thermocouples; Pt100 and Ni120 RTDs; and 4-20 mA temperature transmitters with internal loop power. This variant was originally developed for GE’s most demanding turbine monitoring applications—offshore platforms, coastal power plants, and high-humidity environments—where a mix of sensor types is present and environmental protection is critical. For applications requiring maximum flexibility in the harshest conditions, this board represents the pinnacle of Mark V temperature measurement capability.

Key Technical Specifications

Key Selling Points & Differentiators

• Three sensor types in one board. Supports thermocouples, RTDs, and 4-20 mA transmitters—the most versatile temperature input module in the Mark V line.
• Gold-plated terminals eliminate oxidation errors. Critical for thermocouple and RTD measurements where small signal levels make terminal resistance errors significant. Particularly valuable in coastal and high-humidity environments.
• Conformal coating for harsh environments. Acrylic coating protects against condensation, salt spray, and airborne contaminants—essential for offshore, coastal, and outdoor installations.
• Internal 24V loop power for 4-20 mA transmitters. No external power supply needed—simplifies wiring and reduces cabinet complexity.
• Enhanced accuracy across all modes. The 1A1A variant offers improved accuracy over the standard TIMC: ±0.15% ±0.4°C (TC), ±0.08% ±0.2°C (RTD), and ±0.04% (4-20 mA).
• Configurable per channel. Each channel independently configurable for any supported sensor type—maximum flexibility for mixed-sensor applications.
• 48-hour burn-in with accuracy verification for all three modes at temperature extremes. Every unit is tested at 25°C and 50°C with precision sources for all three input types. Terminal contact resistance and cold junction accuracy are verified under both conditions.
• 18-month warranty covering accuracy, coating integrity, and terminal corrosion resistance for all sensor types. If the board drifts beyond spec, coating delaminates, or terminals show oxidation, we replace it.

Frequently Asked Questions (FAQ)

Q: What does “1A1A” mean on this TIMC board?

A: The suffix adds two upgrades to the TIMC platform: first “1A” indicates conformal coating (acrylic-based PCB protection), and second “1A” indicates gold-plated terminals plus enhanced precision components for improved accuracy. Combined with the TIMC’s universal sensor support (TC, RTD, and 4-20 mA), this is the most versatile and environmentally protected temperature input module GE produced for the Mark V. It was originally manufactured for offshore platforms and coastal power plants with mixed sensor types.

Q: What is the difference between the TIMC1A1A and the standard TIMC?

A: Five key differences: (1) gold-plated terminals, (2) conformal coating, (3) improved accuracy across all modes, (4) enhanced cold junction compensation (±0.12°C vs. ±0.15°C), and (5) improved noise rejection. The TIMC1A1A is the “premium” version with all available environmental and precision upgrades.

Q: Can I use the TIMC1A1A with 4-20 mA transmitters, RTDs, and thermocouples on the same board?

A: Yes—each of the 8 channels is independently configurable. You could have Channel 1 as a Type K thermocouple for exhaust gas, Channel 2 as a Pt100 RTD for bearing temperature, Channel 3 as a 4-20 mA transmitter for pressure, and so on. All configuration is done through the Mark V software.

Q: The gold-plated terminals—are they compatible with all sensor types?

A: Yes—gold is compatible with thermocouple alloys (J, K, T), RTD leads (copper, nickel), and 4-20 mA transmitter wiring. Gold does not react with any of these materials and does not generate parasitic thermal EMF. This is a significant advantage over tin or nickel-plated terminals in thermocouple applications.

Q: My plant is in a coastal environment. Will the conformal coating and gold terminals make a difference?

A: Yes—substantially. Standard tin-plated terminals oxidize in salt-laden air, creating resistance and parasitic thermal EMF that adds measurement errors. Standard PCBs corrode over time, affecting signal integrity. The TIMC1A1A’s gold terminals eliminate oxidation, and the conformal coating protects the PCB from moisture and salt. We’ve tracked these boards in offshore installations for over 10 years with no measurable terminal-related drift or coating degradation.

Q: Does the TIMC1A1A support Type N thermocouples?

A: No—the TIMC series supports J, K, and T only. If you need Type N support, use the STCA series (STCA or STCA1A1A). For mixed-sensor applications requiring Type N, you would need a combination of STCA for Type N and TIMC for RTDs and 4-20 mA.

Q: What is the internal loop power voltage for 4-20 mA transmitters?

A: The internal loop power provides 24V DC nominal. The actual voltage may be slightly higher or lower depending on loop resistance, but it’s regulated to maintain at least 18V at the transmitter under full load (20 mA, 250Ω burden, plus cable resistance).

Q: Is the TIMC1A1A a direct replacement for my existing dedicated modules?

A: Yes—100% mechanical and electrical compatibility. Same form factor, same DIN connector, same pinout, same field wiring terminal block. The Mark V CPU recognizes the board identically—you just need to configure each channel’s sensor type in the software. No hardware changes are required.

Q: How do I verify the conformal coating on the board I receive?

A: The acrylic coating has a UV tracer—it fluoresces blue-green under 365nm UV light. We include a UV pen light with every shipment. The coating also gives the component side a glossy sheen. Our QC report includes UV-light photos of your specific board. If you don’t see fluorescence or gloss, contact us immediately.

Q: What is the accuracy of the TIMC1A1A in 4-20 mA mode?

A: The accuracy is ±0.04% of span, which translates to approximately ±0.0064 mA. At a typical transmitter range of 0-100°C (4-20 mA), this is ±0.08°C accuracy, plus the transmitter’s own accuracy. This is among the best available for any Mark V analog input module.

Q: The TIMC1A1A has 8 channels. Can I mix grounded and ungrounded thermocouples?

A: Yes—the board’s channel-to-channel isolation (2500V) allows mixing grounded and ungrounded thermocouples without ground-loop issues. Grounded thermocouples with the sheath connected to equipment ground will not affect other channels.

Q: What is the warranty on the TIMC1A1A?

A: 18 months from shipment, covering accuracy in all three modes, loop power functionality, coating integrity, and terminal corrosion resistance. If the board fails to maintain accuracy, coating delaminates, or terminals show oxidation, we replace it. We maintain a dedicated stock for warranty replacements.

Q: Do you have many TIMC1A1A boards in stock?

A: The TIMC1A1A is a rare variant—it was a special-order board for critical applications. We typically have 3-5 units in stock. If you need more than two, contact us directly to confirm availability. Given the versatility and environmental protection this board offers, we recommend securing your requirements now while stock is available.

HONEYWELL CC-PCNT01
SIEMENS 1FT5044-0AF71-1
TOYODA TPC-2816
A-B 1747-L551/C
A-B 1747-L552