---
product_id: 807173692
title: "(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5"
brand: "ace instruments"
price: "¥8583"
currency: JPY
in_stock: false
url: https://www.desertcart.jp/products/807173692-pack-of-4-differential-pressure-switch-range-50-to-500
store_origin: JP
region: Japan
---

# (Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5

**Brand:** ace instruments
**Price:** ¥8583
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** (Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 by ace instruments
- **How much does it cost?** ¥8583 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/807173692-pack-of-4-differential-pressure-switch-range-50-to-500)

## Best For

- ace instruments enthusiasts

## Why This Product

- Trusted ace instruments brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

QBM 81-5 is a Differential pressure switch for monitoring air pressure in HVAC systems. Differential Pressure Switches are used to monitor differential pressure, under pressure and overpressure in HVAC installations. By measuring differential pressure, they monitor the state of air filters, prevailing airflows, damaged fan belts and overpressure in clean rooms, kitchens, etc. They are also used to monitor differential pressure and positive and negative relative pressure in HVAC systems.

## Features

- Monitors air filters, airflow and fan belts | Can be used to monitor pressure in clean rooms, kitchens, etc. | Easy to mount | Long-term stability | Highly precise setting
- Pressure Range: 50 to 500 Pa (0.20 to 2.00 Inches WC or 0.5 to 5 mbar) | Ambient Operation temperature: –4°F to 185°F (–20°C to 85°C) | Ambient Storage temperature: –40°F to 185°F (–40°C to 85°C)
- Ambient Humidity: <90 % r.h. (non-condensing) | Reset: Automatic | Max. unilateral overload: for 30 to 75 °C is 7500 Pa ;for -30 to 85 °C is 5000 Pa | Permitted media Air, non-corrosive gases
- Protection class: III according to EN 60730-1 | Protection degree of housing: IP54 | Electrical connection: 3 screw terminals | Cable entry: PG11 cable gland | Pressure connections: Male, dia. 6.2 mm
- Supply Scope: 1 unit of QBM 81-5, 2 duct adaptors, 4 fixing screws, 2 m tubing, 5/8 mm diameter & Instruction manual | Applications: HVAC, Monitors Air Filters, Airflow and Fan Belts, Clean Rooms, Kitchens, etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CBQ6Q187 |
| Brand | Ace Instruments |
| Brand Name | Ace Instruments |
| Included Components | QBM 81-5 along with instruction Manual |
| Manufacturer | Ace Instruments |
| Number of Items | 4 |
| Part Number | IK-AMZ-QBM81-5 |

## Images

![(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 - Image 1](https://m.media-amazon.com/images/I/51FA1h7b1cL.jpg)
![(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 - Image 2](https://m.media-amazon.com/images/I/51iW4CDVM+L.jpg)
![(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 - Image 3](https://m.media-amazon.com/images/I/51NrGiDx6qL.jpg)
![(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 - Image 4](https://m.media-amazon.com/images/I/51fGAg-5zzL.jpg)
![(Pack of 4) Differential Pressure Switch (Range: 50 to 500 Pa) for HVAC, HEPA Filters, Cleanrooms, Prevailing Airflows, Kitchens, Monitors Air Filters | Model: QBM 81-5 - Image 5](https://m.media-amazon.com/images/I/51CCyvDLhKL.jpg)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-02*