# Welch Allyn 420 Series

> Source: https://shop.ezmedsource.com/products/welch-allyn-420-series

## At a glance

- **Manufacturer:** Welch Allyn
- **Model:** 420 Series
- **Category:** Patient Monitor
- **Modality:** Monitor

## Description

The Welch Allyn 420 Series is a portable spot-check vital sign monitor in the 420 product line. It displays patient data from internal parameters on a monochrome display and is controlled via button navigation. The unit is lightweight and battery-powered, making it suitable for bedside or transport use. The monitor accepts either Masimo or Nellcor pulse oximetry modules.

## Common Problems

- Main PCB failure or defect
- NIBP pump failure or parameter module malfunction

## Specifications

| Spec | Value |
| --- | --- |
| Display Type | Monochrome |
| Power Source | Battery |
| SpO2 Compatibility | Masimo or Nellcor |

## Vendor offers

### Pioneer Biomedical

- **TradeIn** · Quote on request · availability: AvailableOnRequest
- **Repair** · Quote on request · availability: AvailableOnRequest
- **Rent** · Quote on request · availability: AvailableOnRequest
- **Purchase** · Quote on request · availability: InStock

### Prescott's Med

- **Repair** · Quote on request · availability: AvailableOnRequest
- **Purchase** · Quote on request · availability: InStock

## Documents

- [Welch Allyn_vital Sign 420_Calibration](https://storage.googleapis.com/ezmedsource-product-images/product-manuals/b678882430aab2c2.pdf) — manual
- [Welch Allyn_vital Sign 420_disassembly](https://storage.googleapis.com/ezmedsource-product-images/product-manuals/d8689c802f429f6b.pdf) — manual

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