# MRLDS 400

> MRLDS 400 (iPhone/iPad app by Copeland LP.)

- Source: https://appshunter.io/ios/app/mrlds-400/id1502566407 (this page in markdown: same URL + `.md`)
- Developer: [Copeland LP](https://appshunter.io/developer/464252882)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 8 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, European Spanish
- Released: 2020-03-18
- Data updated: 2026-08-14
- User reviews in markdown: https://appshunter.io/ios/app/mrlds-400/id1502566407/reviews.md

## What is MRLDS 400?

The Copeland MRLDS 400 App allows users to configure, maintain and interface with compatible MRLDS-400 Gas detectors. Once a Bluetooth connection has been established, the app replaces the need for specialty training/tools and makes compliance with safety standards (ASHRAE 15, EN 378) easy and effective. 
Features include:
-Configuration (Rename device, define alarm thresholds, adjust Modbus settings, configure relay behavior and manage analog output settings.)
-Maintenance (test LED/buzzer function, relays, and analog output level.)
-Calibration (View sensor type, serial number and “Calibration Due” timer and initiate zero / span calibrations with customizable field calibration certificate.)
Intuitive Interface (view current gas measurement and acknowledge alarm/fault status.)


## Version history (last 4 releases)

### 1.4.6 — 2026-01-29

Support for iOS 26.

### 1.4.2 — 2025-09-08

Rebranded for Copeland

### 1.1.0 — 2020-08-08

- Bug fixes
- Support %VOL & %LEL units.

### 1.0.0 — 2020-03-19

No release notes.

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## More apps by Copeland LP

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- [HVACR Check & Charge](https://appshunter.io/ios/app/hvacr-check-and-charge/id574809181)
- [Sensi Predict](https://appshunter.io/ios/app/sensi-predict/id660619235)

All apps by Copeland LP: https://appshunter.io/developer/464252882

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*