DS-RF Selective Formaldehyde module HCHO Module

Brief Introduction

DS-RF selective formaldehyde module can detect HCHO, VOC, TVOC, t & RH at the  same  time.  The  module  combines  selective  HCHO  sensor  with  advanced electronic control technology, converting HCHO concentration into PPM directly. The module realizes the  detection  of VOC  and  TVOC  based  on  fuel  cell  technology. DS-RF selective HCHO module is free from the influence of the interference gases, such  as  C2H5OH,  C6H6,  NH3,  CO,  etc.  DS-RF  selective  HCHO  module  is pre-calibrated in the factory and can be integrated into your system directly.

Typical Applications      

Smart home

Air purifier

Air conditioners

Portable devices

Wearable devices

HCHO detector

Key Features

Selective detection of HCHO

Detection of HCHO, VOC, TVOC, t, RH together

VOC & TVOC detection based on fuel cell tech.

High precision

Fast response

Long service life

High stability

Diagram

note：1 All dimension is in mm

2 The tolerance is ±0.15mm 

Definition of Pins

Technical Specification

Cross Sensitivity of HCHO

Communication Protocol

Ø General Settings

Module makes use of serial communication.

Communication configuration parameters are:

Ø Communication Command

There are two communication types: active upload type and Q&A type. The default type is active upload and it sends gas concentration once every second. Commands are as follow: 

Gas concentration = C-high*256 + C-low                  1ppm = 1000ppb

temperature = t-high + (t-low / 100 )

humidity = RH-high + (RH-low/ 100)

Switch to Q&A mode：

Switch to active upload mode：

To read temperature and humidity：

To return:

temperature = t-high + (t-low / 100 )

humidity = RH-high + (RH-low/ 100)

To read gas concentration：

To return:

Gas concentration = C-high*256 + C-low