GE IS200PICHG1A | Mark VIe Pulse Input Count Module

Description

Product Introduction

The GE IS200PICHG1A is the module that counts the pulses—flow meters, speed sensors, position encoders, and event counters all feed into this eight-channel pulse input module. It’s the dedicated counter module for the Mark VIe system, taking high-speed pulse inputs and totalizing them with 32-bit counters, then providing outputs for alarms and control.

The “PICH” designation tells you this is a pulse input count module. The “G1A” is the base revision. The module has eight isolated pulse inputs that can handle frequencies up to 10 kHz—enough for most flow meters and speed sensors. Each input has a 32-bit counter that can operate in frequency, period, or totalized count mode. The module also has eight digital outputs (0.5 A) for alarms, resets, and control. All field circuits have 2,500 V isolation. This module is the counter workhorse for turbine flow monitoring, speed sensing, and event counting.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The PICHG1A has eight pulse inputs—our 28-point inspection verifies frequency accuracy, counter operation, and output response.

Incoming Verification. OEM packing slip matched to GE’s serial database. We log the serial and photograph the anti-static bag before cutting. The holographic GE label gets a UV check. The PCB edge must read “–PICHG1A” clearly.

Visual Inspection. Magnifying lamp, full board scan. The pulse input section (optocouplers) is inspected for any signs of damage. The 96-pin backplane connector must show zero wear.

Live Functional Test. Mark VIe test rack with a programmable pulse generator (0.5 Hz–10 kHz) and a load bank for outputs. ToolboxST v5.3 logs the data.

• Frequency accuracy test: Inject 50 Hz, 1 kHz, 5 kHz, and 10 kHz—verify the frequency reading matches within ±0.02%.
• Counter test: Inject 1,000 pulses at 1 kHz—verify the counter reads 1,000 ± 1.
• Period measurement test: Inject a 10 Hz signal—verify the period reading matches within ±0.5 ms.
• Totalized count test: Run for 10 minutes at 1 kHz—verify the totalized count accumulates correctly.
• Output test: Command each output on/off—measure response time (<2.2 ms) and voltage under a 100 Ω load.
• Isolation test: 2,500 V RMS—no breakdown.
• 24-hour soak: All pulse inputs at 1 kHz, all outputs on—log errors.

Electrical Parameters. Insulation resistance: 500 VDC via Megger MIT420, >20 MΩ. Ground continuity: <0.1 Ω.

Firmware Verification. Read the FPGA firmware via ToolboxST—verify the checksum.

Final QC & Packaging. The QC report includes frequency accuracy, counter test, period measurement, totalized count, isolation test, and a photo.

Field Replacement Pitfalls

The PICHG1A is a pulse input module—installation mistakes are usually about signal levels and grounding. I’ve seen these across the fleet.

Input Signal Levels—24 VDC is Nominal, 18–32 V is the Range. The inputs trigger on >18 V. If your sensor outputs 12 V, the module won’t see it. One site in Texas had a flow meter that output 12 V—the module read zero flow. The fix: use a sensor with a 24 V output.

Maximum Frequency—10 kHz is the Limit. The PICHG1A is rated for 10 kHz. If you’re using a 15 kHz encoder, the module won’t measure accurately. One site in Ohio had a 15 kHz speed sensor—the module read 12 kHz. The fix: use a module rated for higher frequency.

Counter Rollover—32-bit is 4.29 Billion Counts. At 10 kHz, it takes 119 hours to roll over. For flow totalization over days, rollover matters. One site in California had a flow meter running at 5 kHz—the counter rolled over every 238 hours, and they didn’t notice until the totalizer reset to zero. The fix: implement rollover compensation in the CPU logic.

Output Configuration—The Outputs Are Standard, Not High-Speed. The eight outputs are 2 ms response—fine for alarms and resets, but not for high-speed control. Use the outputs for annunciation, not for pulse generation.

Grounding—2,500 V Isolation, But Long Cables Need Shielding. Pulse signals are high-frequency—long cable runs can pick up noise. Use shielded twisted-pair cable and ground the shield at the module end only.

ESD. The pulse input optocouplers are CMOS—sensitive. I watched a tech handle a bare PICHG1A on a dry day—he discharged through the terminal block, and the input optocoupler for channel 5 was damaged. Strap up.

New Original vs. Refurbished: Why It Matters

The PICHG1A has high-speed optocouplers—refurbishers often can’t verify the 10 kHz spec.

What “New Original (New Surplus)” means. This IS200PICHG1A came from GE’s factory, never mounted. The optocouplers are fresh. We break the seal only for testing.

Refurbished risk in plain terms. The optocouplers slow down with age—their current transfer ratio drops. A refurbished PICHG1A might not meet the 10 kHz spec. I’ve tested refurbished PICHG1A units that failed at 8 kHz. Failure rate on refurbished pulse input modules runs 5× higher than new, based on our service data.

Real cost of a refurbished failure. A flow meter totalization is off by 2%—the plant buys less fuel than it actually used. Over a year, that’s a 50,000 discrepancy. The refurbished module saved you 800. The failure cost you 62× that.

What we provide as proof. For every IS200PICHG1A we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes frequency accuracy at 10 kHz, counter test, period measurement, totalized count, isolation test, and a sealed anti-static bag.

Pricing context. Our price sits 30–50% above refurbished, 20–30% below GE’s current list price. The delta covers our sourcing, our high-speed pulse testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack (ambient 45 °C, supply +5.0 VDC, ToolboxST v5.3, programmable pulse generator, load bank, hi-pot tester).

• Frequency accuracy at 10 kHz: Error 0.01%—within 0.02% spec.
• Frequency accuracy at 1 kHz: Error 0.005%.
• Counter test: 1,000 pulses—counted 1,000 exactly.
• Period measurement: 10 Hz signal—period read 100.1 ms—within ±0.5 ms.
• Totalized count: 10 minutes at 1 kHz—600,000 pulses counted—error 0.0%.
• Output response: 2.1 ms—under 2.2 ms.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 60 °C ambient, the module ran at 56 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 60,000 hours at 40 °C—that’s 6.8 years. Refurbished units with aged optocouplers show a demonstrated MTBF around 10,000 hours—the optocouplers fail from thermal stress.

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