DS-HCHO

Overview

DSENSOR Digital output formaldehyde sensor

DS-HCHO series data manual

DS-HCHO is a highly integrated, high accuracy and high

Stability digital electrochemical method formaldehyde sensor.

It can detect formaldehyde in many places in real time. It has

A small volume, can be used conveniently, etc, and can be

Used in the industrial and household, and can be used in automobiles, air

condition, TV, and other carrier.

DS-HCHO uses a unique electrolyte technology, and it has built in high-

performance analog circuits and data processing unit, integrated a large

number of experience algorithms and directly output digital density

information. It has already done standard gas concentration calibration and

zero calibration. The analog signal is directly converted to a digital

concentration output. It is easy to use, convient and fast.

Parameter Index unit

Effective Range 0-1 mg/m 3

Maximum Range 2.5 mg/m 3

Working Temperature

Range

Working Humidity

reset

pin/TTL @3.3V

7 RX Serial port recieving

DS-HCHO adopts P2P call & answer type mechanism

There are seven bytes in the format of host sending commands.

Format description:

Starting symbol 1 2 is fixed symbol 0x42 0x4d

Command symbol CMD is command parameter of hosting sending to

equipment.

Data H and L are the high and low bype respectively of the data for host

sending to equipment.

Calibration H and L are data package and the test of high and low bytes

respectively.

Command description:

4 Rstore the factory initial

value --

Sample:

Query and monitoring data instruction sent by host

0x42 0x4d 0x01 0x00 0x00 0x00 0x90

Data packets of returned module

The definition of gas type identification

Data definition

The definition of monitoring unit

Data content Unit

The definition of data equivalence

Data content The definition of data

equivalence

The actual data is equal to the monitoring data dividing the data equivalence.

Communication example:

0x42 0x4d 0x08 0x14 0x05 0x03 0x00 0x0a 0x00 0xbd

The concentration of monitoring gas, formalderhyde, is 0.10mg/m3.

Detailed description:

0x4d 0x42 steadfastly expresses symbol.

0x08 means eight bytes sent follow-up(including its own)

0x14 monitoring type indicates formaldehyde

0x05 is the data unit identification mg/m3

0x03 data equivalence represents 100

0x0a 0x00 returning data 0x000a equals to 10

Actual data equals to returning data / data equivalence, means 10/100 or 0.10

0xbd 0x00 data is to check high or low byte

Notes:

1. The power supply time should not be less than 48 hours.

2. In addition to formaldehyde, many other active gases can affect the

electrochemical formaldehyde sensor, mainly including methanol, ethanol,

toluene, xylene, carbon monoxide, hydrogen sulfide, etc.

3. Long-term storage or use of high-concentration sensitive gases such as

high concentration of aldehydes and alcohols can affect the life of the

sensor.In particular, long periods of saturation gas concentration beyond

the maximum range can result in short-term failure of the sensor, or a

certain probability of long-term failure.

4. Corrosive gas environment can also reduce or disable sensor service life.