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Key Technical Specifications
- Product Type: Field Interface Card for the System 57 (5701) gas detection rack — sensor input only, no relays onboard
- System Compatibility: System 57 platform, alongside the Engineering Card (05701-A-0361), DC Input Card (05701-A-0325), and Single Channel Control Cards (05701-A-0301, -0302, -0351)
- Function in the Rack: Terminates and passes the sensor input signal into the rack for processing by the associated control card; alarm and fault relay switching is provided separately by cards such as the Double SPCO Relay Card (05701-A-0327) or Triple SPCO Relay Card (05701-A-0328)
- Rack Format: System 57 card-type construction, installs into a standard System 57 rack alongside other 057xx-series cards
⚠️ Independently confirmed electrical specs (power draw, precise dimensions) for this specific card weren’t available across current distributor listings the way they were for related System 57 cards — several reseller pages describe entirely unrelated products under this same part number (a UV flame amplifier, a generic frequency controller, a generic DCS I/O module). None of that matches what Honeywell’s own System 57 documentation and the more reliable distributor listings describe. Pull the OEM System 57 manual before specifying wiring or a replacement.
Product Introduction
The Honeywell 05701-A-0326 is a Field Interface Card built for the System 57 gas detection platform. Unlike the Relay Cards in the same family, it carries sensor input termination only — no onboard alarm or fault relays — so it’s paired with a separate Relay Card when relay-switched outputs are needed for that channel.
Plants running System 57 racks use this card where a channel needs sensor input handling but relay switching is already covered elsewhere in the rack, or isn’t required at all for that particular point. Because it fits the same rack architecture as the rest of the 057xx-series cards, replacing it doesn’t require touching the Engineering Card’s configuration for other channels.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No sensor signal reaching the associated control card | Broken field wiring at the interface card terminals, or a failed sensor drive path | ✅ High | Measure the sensor loop signal directly at the field wiring terminals on the card | Verify field wiring and sensor before condemning the interface card |
| Rack reports a fault on this channel | Loose backplane connection, or a genuine card-level fault | ⚠️ Medium | Reseat the card fully in its rack slot and check backplane connector pins | Rule out the connection before replacing the card |
| No relay output on an alarm condition | Expected — this card has no onboard relays | ❌ Low | Confirm whether a separate Relay Card is installed and wired for this channel | Not a fault with this card; check the paired Relay Card instead |
| Sensor reading present at the card but not reflected on the front panel display | Fault in the paired Single Channel Control Card, not the interface card | ⚠️ Medium | Swap the sensor input to a known-good channel to isolate which card is at fault | Isolate between the interface card and the control card before replacing either |
| Intermittent signal dropout under vibration | Loose or corroded field wiring connector at the card terminal block | ⚠️ Medium | Inspect and reseat the field wiring connector | Correct the connection before assuming an internal card fault |
If these checks don’t resolve the issue, contact technical support with the rack’s fault indication and confirmation of which control and relay cards are paired with this channel.
05701-A-0326
05701-A-0326
Frequently Asked Questions (FAQ)
Does this card provide alarm relay outputs on its own?
No — that’s the defining difference for this part number. It handles sensor input only. If you need relay-switched alarm outputs for that channel, you’ll need a separate System 57 Relay Card (such as the 05701-A-0327 or -0328) paired with it.
Is this a drop-in replacement for whatever’s currently in that rack slot?
Confirm the exact part number on the card you’re pulling before ordering. System 57 has several similarly named interface and control cards with different relay configurations — mixing up a Field Interface Card with a Relay Card or a Single Channel Control Card will leave that channel non-functional even though it physically fits the rack.
Will I need to reconfigure the Engineering Card after swapping this?
Possibly, depending on how your rack is set up — check your commissioning records for that channel. Since this card handles sensor input rather than alarm logic, the configuration impact is generally narrower than replacing a full control card, but confirm rather than assume.
Can this be used with any gas sensor type, or is it input-type specific?
Match it to the same sensor input configuration as the card you’re replacing. System 57 cards are generally built for a specific input type (4-20mA loop vs. catalytic bridge, for example), and this card needs to be paired correctly with the rest of your rack’s configuration.
Is this still available new from Honeywell?
Treat it as a legacy part for a discontinued platform — availability is inconsistent across distributors, and what’s on the market is largely surplus or refurbished stock rather than current factory production.
Why do some listings for this exact part number describe completely different products?
A number of reseller pages online appear to be mismatched or auto-generated and describe unrelated hardware — a flame detector amplifier, a generic frequency controller — under this same part number. Don’t rely on any single distributor page; confirm against Honeywell’s own System 57 documentation.
What warranty should I expect on a part like this?
Terms vary by seller — some offer standard one-year coverage, others sell as-is surplus. Since this is a safety-related gas detection system, get the seller’s testing and warranty terms in writing before installing it in a live monitoring rack.
