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Phone: +86 16626708626Description
Key Technical Specifications
- Product Type: Single Channel Control Card for a System 57 gas detection rack
- Input Configuration: 4-20mA current loop (uses Sensor Drive Module, p/n 05701-A-0283)
- Power Supply: 18 to 32 VDC
- Power Consumption: 3.25 W typical (4-20mA sensor input)
- Display: 25-segment analogue bar display, 4-character digital readout, plus a message display
- Alarm Indicators: LEDs for A1, A2, A3 gas alarm levels, plus fault/inhibit status
- Alarm Adjustment: Configurable in 1% full-scale deflection (FSD) steps
- Rack Format: 3U card, fits 19-inch or half-19-inch System 57 racks
- Commissioning Interface: Configured and validated through the System 57 Engineering Card (p/n 05701-A-0361)
- Optional Expansion: Analogue Output Module for remote 0-20mA/4-20mA monitoring output
- Weight: Approximately 0.35 lbs (159 g)
Product Introduction
The Honeywell 05701-A-0301 is a Single Channel Control Card built for the System 57 gas detection platform, a product line that traces back to Zellweger Analytics before the Honeywell brand. It takes a 4-20mA current loop input from a connected gas sensor and handles the display, alarm triggering, and status reporting for that one channel, with alarm points adjustable in 1% FSD steps.
Plants keep this exact card on hand because it slots into an existing System 57 rack alongside other channel cards and is commissioned through the rack’s shared Engineering Card. Replacing a failed channel card this way means the rest of the rack’s wiring and configuration stay untouched — only the one channel needs recommissioning.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Display blank, no power indication | Loss of 18–32 VDC supply from the rack’s DC Input Card, or a backplane connection fault | ✅ High | Measure supply voltage at the rack’s DC Input Card | Verify rack power before replacing this control card |
| Reading stuck at zero, no response to the sensor | Broken 4-20mA field wiring, or a failed Sensor Drive Module | ✅ High | Measure loop current directly at the Sensor Drive Module terminals | Check field wiring and the sensor itself before condemning the control card |
| False or nuisance alarm triggering | Alarm setpoint has drifted from its configured value, or the sensor itself is drifting | ⚠️ Medium | Use the Engineering Card to check configured setpoints against your commissioning records | Reconfigure via the Engineering Card before assuming the control card has failed |
| Fault/Inhibit LED lit | Card intentionally placed in inhibit mode during maintenance, or a genuine self-test fault | ⚠️ Medium | Check whether the card was deliberately inhibited through the Engineering Card | Clear the inhibit if intentional, or investigate the specific fault reported if not |
| Analogue output reading doesn’t match the front panel display | Optional Analogue Output Module miswired or misconfigured | ❌ Low | Verify wiring and configuration of the Analogue Output Module separately | Isolate the output module before replacing the main control card |
If these checks don’t resolve it, contact technical support with the specific LED/fault pattern and your commissioning records for that channel before ordering a replacement.
05701-A-0301
05701-A-0301
Frequently Asked Questions (FAQ)
Will a replacement card keep my existing alarm setpoints?
No. Alarm setpoints are configured through the System 57 Engineering Card, not stored permanently on the channel card in a way that transfers automatically. Have your commissioning records on hand and be ready to reconfigure the setpoints on the replacement card.
Can I hot-swap this in a live rack?
Be careful here — pulling a live channel card disables alarm coverage for whatever gas detector is wired to it. Coordinate with your safety procedures for a bypass or hot-work permit before pulling the card, rather than assuming it’s a simple live swap.
Is this compatible with catalytic gas sensors as well as 4-20mA sensors?
No — this specific part number is the 4-20mA input variant. The catalytic sensor version is a different control card in the same family. Don’t mix these up; wiring a catalytic sensor into a 4-20mA-configured card won’t give you a valid reading.
Do I need the Engineering Card to get this running?
Yes. Commissioning, alarm setpoint configuration, and self-validation all run through the Engineering Card, which sits in the right-hand slot of the rack. Without it, you can’t properly configure a new channel card.
Why do I see this listed under both Zellweger and Honeywell?
The System 57 platform originated under Zellweger Analytics before that business became part of Honeywell Analytics. It’s the same product lineage — just reflecting which company owned the line at different points, not a different design.
Is this still available new from Honeywell?
No — it’s discontinued by the manufacturer. What’s available now is new surplus stock or refurbished pulls rather than a current factory build.
What warranty comes with a discontinued part like this?
Terms vary by seller — some offer a standard one-year warranty, others extend to two years on tested surplus. Get the specific coverage in writing, especially since this card is part of a safety-related gas detection system and a bad replacement isn’t something you want discovered after installation.
