Product Overview
Analog Devices 5B31-01 Isolated Voltage Input Signal Conditioner, Plug-In Module with a Legible Factory Label
Condition
Used, untested surplus. The photographed module is a blue plug-in package with its white factory label intact and fully legible: MODEL 5B31-01, TYPE ISOLATED VOLT INPUT, INPUT -1 V to +1 V, OUTPUT -5 V to +5 V, DATE CODE 9845-0001, CL. 1, DIV. 2, GR. A,B,C,D, with CSA LR80472-2, CE, FM APPROVED and STATIC SENSITIVE marks, the Analog Devices logo, and PHILIPPINES beneath it. Under the usual year-week convention that 9845 code reads as late 1998 production. The case shows no cracks, scorching, or label damage in the photo. A second 5B module lies beneath the labeled one inside the same clear plastic bag with its pins facing up, so the row of gold-plated header pins you can see belongs to that lower module - the labeled unit's own pin row faces down into the bag and is not in view, and we make no claim about its condition. Two are in stock and the price is for one module; the photo shows a representative piece, the lower module's label is not readable in the frame, and a second unit may carry a different date code.
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Product Overview
The 5B31-01 is an isolated voltage input signal conditioner from the Analog Devices 5B series, the plug-in module family used to get a field voltage safely and cleanly into a data acquisition or control system. Its own label states the job in two lines: it takes a -1 V to +1 V input and delivers a -5 V to +5 V output, with isolation between the field side and the system side. The label also carries the hazardous-location line CL. 1, DIV. 2, GR. A,B,C,D along with CSA, CE and FM marks, which is why modules like this turn up in process plants rather than only on benches. 5B series modules are designed to plug into Analog Devices 5B backplanes and mounting sockets; confirm your backplane, channel wiring and the current 5B31 datasheet before installing, since we sell this one untested and specifications beyond what the label prints are not confirmed here.
Key Features
- Model: 5B31-01, marked on the factory label
- Type: isolated volt input signal conditioning module
- Input range printed on label: -1 V to +1 V
- Output range printed on label: -5 V to +5 V
- Date code printed on label: 9845-0001
- Hazardous location line on label: CL. 1, DIV. 2, GR. A,B,C,D
- Agency marks on label: CSA LR80472-2, CE, FM APPROVED
- Marked STATIC SENSITIVE, handle with normal ESD precautions
- Manufactured in the Philippines per the label
- Gold-plated plug-in header pins along the bottom edge
- Sold as a single module; two in stock
Applications
- Plant instrumentation technician replacing one failed voltage channel in an existing 5B rack without buying a whole new module set
- Controls engineer keeping a legacy data acquisition cabinet running where the original 5B backplane is still in service
- Test lab building a low-level voltage front end that needs channel-to-system isolation ahead of an analog input card
- Maintenance shop stocking a spare for a Class 1 Division 2 area panel where the module type is fixed by the original design
Frequently Asked Questions
What input and output does this specific module handle?
The factory label prints INPUT -1 V to +1 V and OUTPUT -5 V to +5 V. Those are the figures on the part in the photo. Any other parameter you need - isolation voltage, bandwidth, accuracy, power requirements - is not confirmed by us; check the Analog Devices 5B31 datasheet before you design it in.
Will it drop into my existing 5B rack?
5B series modules are built to plug into Analog Devices 5B backplanes and sockets. The labeled module's own pin row faces down into the bag and is not visible in the photo, so we make no claim about its pins. We have not fitted it to a backplane here, so match your rack, channel assignment and wiring against the datasheet and your original drawings before you commit to it.
What does the 9845 date code mean?
It is printed on the label as DATE CODE: 9845-0001. Read under the usual year-week convention that points to late 1998. This is older surplus stock, not current production, and it is offered as such.
The module looks clean in the bag. Is it new?
We list it as Used. The label is intact and the case is clean, which is normal for a module that came off a shelf or out of a panel and was bagged for storage, but we do not claim it is unused and we have not powered it up.
It is sold untested, so what am I actually taking on?
You are getting one Analog Devices 5B31-01 module in the condition the photo shows: label legible, case undamaged, its own pin row not in view and therefore not claimed, no power-up or accuracy check performed by us. The photo is the spec for the piece we photographed, and with two in stock a second unit may differ in date code. If your application can accept an untested module that you will verify on your own bench or against a known-good channel, this is a straightforward way to get the exact part number your rack already expects. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Somewhere a control cabinet built in the late 1990s is still counting on a small blue brick to keep the field side and the logic side politely apart. If that cabinet is yours and the channel it needs is a 5B31-01, this one is waiting for a meter and a socket.
