Interscan Corporation ACCUSAFE F901B Manuel utilisateur

Interscan Corporation.

Instruction Manual

ACCUSAFESensorModule

 
 
Accusafe Sensor Module User Manual 1 06/21/2021 
 
Table of Contents 
Section 1 - Introduction...................................................................................................................................... 2 
1 Important Safeguards .............................................................................................................................. 2 
2 Accusafe F901B Sensor Specifications..................................................................................................... 3 
2.1 Sensor MODULE Configuration......................................................................................................... 3 
Section 2 - Installation ........................................................................................................................................ 4 
1 Enclosure Wall Mounting......................................................................................................................... 4 
2 Wiring and Pneumatic Connections ........................................................................................................ 4 
1.1 Power and MODBUS connections .................................................................................................... 4 
1.2 Pneumatic connections..................................................................................................................... 5 
Section 3 - Operation.......................................................................................................................................... 7 
1 Pump & Sensor Operation....................................................................................................................... 7 
2 MODBUS Operation................................................................................................................................. 7 
2.1 RTU RS485 Configuration.................................................................................................................. 8 
2.2 F-901B MODBUS Specifications........................................................................................................ 9 
2.3 Input Registers.................................................................................................................................. 9 
2.4 Holding Registers ............................................................................................................................ 10 
2.5 Coils................................................................................................................................................. 10 
Section 4 - Calibration....................................................................................................................................... 12 
1 Zero Calibration ..................................................................................................................................... 12 
1.1 Zero Calibration Procedure............................................................................................................. 13 
2 Span Calibration..................................................................................................................................... 15 
2.1 Gas Calibration Procedure......................................................................................................... 15 
2.2 Digital Calibration Procedure.......................................................................................................... 18 
Section 5 - Maintenance of the F-901B............................................................................................................ 20 
1 Replacing the Gas Sensor....................................................................................................................... 20 
2 Particulate Filter Maintenance .............................................................................................................. 21 
Section 6 –Sensor Module Tester App............................................................................................................. 22 
Section 7 - Warranty......................................................................................................................................... 25 
 
 
 

Accusafe Sensor Module User Manual 2 06/21/2021

Section 1 - Introduction

To reduce the risk of fire, electrical shock, injury to persons or permanent damage to this device,

these safety precautions should always be followed:

•Use the included 12VDC power supply or specified power connector to operate this device.

Inappropriate voltage supply or power connector could cause irreparable damage to this

device.

•Make sure power plug and Modbus cable are plugged in and secured before powering up the

device. The power connector will not make connection to GND if not fully plugged into the

socket. Also make sure the locking ring is securely tightened.

•If sampling via tubing, make sure that the tubes are securely attached to the device before

operating. Use the provided particulate filter to prevent dust and particulates from entering the

device. See section 2.1.2, pg. 5.

•Do not operate the device with an obstructed flow path. Obstruction during air sampling will

damage the internal micropump. See section 5.2, pg. 21.

•Do not expose this device to any liquids.

•Sensors must not be exposed to temperature, humidity and pressure that are outside the

operating range. See section 1.2, pg. 3.

1.1 IMPORTANT SAFEGUARDS

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Measurements

Target Gas, RH, Temperature, Barometric

Pressure

Air Sampling Rate

60-160 mL/min (Pump speed 50% - 100%)

Measuring Rate

Continuous

Communication

Modbus via RTU/RS485 & TCP/IP

Sampling Port

Inlet/outlet with Luer lock fittings

Operating environment

0°C - 50°C, 15-90% relative humidity non-

condensing

Power Input

12VDC regulated

Avg. Power Consumption

2.5W

Dimensions

8 in x 4.7 in x 2.2 in (includes mounting flanges)

Weight

0.98kg

Enclosure

Powder-coated aluminum

Gas Sensor

Type

3 electrode electrochemical

Nominal Range

See section 1.2.1 below

Accuracy

± 2% of reading ± least significant digit

Lower Detection Limit

2 ppm

Response Time (T90)

< 3 minutes (varies by gas type)

Temperature Range

-20 °C to 50 °C (varies by gas type)

Pressure Range

atmospheric ± 10 %

Relative Humidity Range

15 % to 90 % R.H. non-condensing

Long Term Output Drift

< 2 - 5 % per month in continuous exposure

(varies by gas type).

Lifetime

2 –3 years (varies by gas type)

1.2.1 SENSOR MODULE CONFIGURATION

This section details the specific gas and range parameters for your ACCUSAFE instrument.

GAS –

SENSOR RANGE –

1.2 ACCUSAFE F901B SENSOR SPECIFICATIONS

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Section 2 - Installation

The sensor module is wall mountable using M5 or #10 screws. Install the module in the immediate

area from which you want to draw sample. Consideration should be givento the whether thetarget

gas is heavier or lighter than air in choosing the height of the installation location. Allow for 18”

total horizontal space to accommodate pneumatic and cabling connections to the sides of

the enclosure.

2.1.1 POWER AND MODBUS CONNECTIONS

Connect the 12V power adapter to the sensor module by inserting the plug into the 12V power

receptacle and tightening the lock ring snugly.

For TCP/IP communications applications, connect a standard CAT5 communications cable to the

MODBUS communications port. This cable will connect to the “ETHERNET” port on the

ACCUSAFE controller module for non-web browser single sensor applications or to an Ethernet

switch or hub for single or multi-sensor applications that utilize the web browser application.

For RTU (RS485) communications applications, connect a standard CAT5 communications cable

to the MODBUS communications port. This cable will connect to the “RS485” port on the

ACCUSAFE controller module for single sensor applications or to the next sensor in the daisy

chain for multi-sensor applications**.

**NOTE: Multi-sensor applications using RS485 connections will require a splitter device be used

at each node in the chain using a multi-drop (daisy chain) topology.

2.1 ENCLOSURE WALL MOUNTING

2.2WIRING AND PNEUMATIC CONNECTIONS

12V Power Receptacle

LED

ModBus Communication Port

Gas Inlet

Gas Outlet

Mounting Holes*

*accepts M5 or #10 screw

3.14 in

”

7.40 in

Accusafe Sensor Module User Manual 5 06/21/2021

NOTE: Waterproof cap for CAT5 cabling shown below (not provided with sensor) can be acquired

as needed at this link: https://www.installerparts.com/16279-patch-cable-waterproof-cap.html

2.1.2 PNEUMATIC CONNECTIONS

A particulate filter (pictured on the right) is provided for

connection to the inlet of the sensor module. This filter

protects the sensor and internal components from dust

and particulates that may be present in the sample.

To connect this filter, slip the end of the filter fitting into

the opening of the inlet fitting and rotate the filter in a

clockwise direction. Tighten snugly but do not over

tighten.

Connect exhaust tubing (1/8” I.D.) as needed by

inserting the provided barbed adapter fitting

connected to tubing into the OUTLET fitting as shown

on the right. Turn the fitting in a clockwise direction

until snugly tightened. Do not over tighten.

RJ45 Male Plug*

Waterproof Cap

ROTATE

Accusafe Sensor Module User Manual 6 06/21/2021

IMPORTANT:

•MAKE SURE POWER CABLE AND MODBUS CABLE ARE SECURED BEFORE POWERING

UP DEVICE.

•MAKE SURE THERE IS NO FLOW OBSTRUCTION AT INLET/OUTLET BEFORE POWERING

UP DEVICE.

•PARTICULATE FILTER SHOULD BE CHECKED PERIODICALLY AND REPLACED AS

NEEDED ACCORDING TO SECTION 5 OF THIS MANUAL.

Accusafe Sensor Module User Manual 7 06/21/2021

Section 3 - Operation

The ACCUSAFE F901B Sensor Module is designed for continuous operation when paired with

the ACCUSAFE Controller Module (see dedicated controller manual for operation of the

controller).

As soon as the F901B Sensor Module is powered up and the firmware is fully booted, the pump

will run continuously, drawing sample air past the sensor. The sensor’s output signal is

communicated via MODBUS to the controller which then displays this signal in graphical and

numeric forms.

The pump’s speed can be controlled at the controller if more or less flow rate is desired (factory

set nominal pumpspeed is 50%). This functionality is described in greater detail in the ACCUSAFE

Controller Module manual.

The F901B supports the standard Modbus protocol in both RTU and TCP/IP modes. The 3

available operation modes are detailed below. (see MODBUS MODE in table 3-4, pg. 10 for

Modbus mode register addressing information). AUTO MODE is the recommended mode and is

factory set prior to shipment:

•AUTO Mode (factory preset mode) - In this mode, if the sensor detects a connection to an

active Ethernet device, it will initialize Modbus TCP/IP protocol via the default static IP address

192.168.1.XX port 502 (The suffix of this address will be indicated on a label next to theEthernet

port. Address is configurable via Modbus commands where necessary. See SLAVE ADDR in

Table 3-4, pg. 10). If not connected to an Ethernet connection, it will initialize in RTU mode.

•Fixed TCP/IP mode - Upon powering up, the F901B always initializes the Modbus TCP/IP

protocol via the default static IP address 192.168.1.XX port 502 (The suffix of this address will

be indicated on a label next to the Ethernet port. Address is configurable via Modbus commands

where necessary. See SLAVE ADDR in Table 3-4, pg. 10).

•Fixed RTU mode - Upon powering up, the F901B always initializes the Modbus RTU protocol

via the default static IP address 192.168.1.XX port 502 (The suffix of this address will be

indicated on a label next to the Ethernet port. Address is configurable via Modbus commands

where necessary. See SLAVE ADDR in Table 3-4, pg. 10).

NOTE: The F901B sensor’s internal communications cabling is configured to operate in TCP/IP

mode. If operating in RTU mode is desired, the internal communications cabling will need to be

swapped. Contact the INTERSCAN SERVICE DEPT. for more information on making this

change.

3.1 PUMP & SENSOR OPERATION

3.2 MODBUS OPERATION

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3.2.1 RTU RS485 CONFIGURATION

RS485 cabling configuration is shown in the diagrams and table 3-1 below.

Name

Type

Description

3.3V

Reference potential

3.3V Reference Voltage

GND

Reference potential

Local device ground

UART_TX

Digital Output

Firmware update interface

B (D-)

Bus In/Out

Driver output and receiver input

A (D+)

Bus In/Out

Driver output and receiver input

UART_RX

Digital Input

Firmware update interface

BOOT

Digital Input

Firmware update interface

RESET

Digital Input

Microcontroller reset input (Active-Low)

Firmware update interface

TABLE 3-1

IMPORTANT: use pin 4,5 (B/A) and GND for Modbus RS485 communication. Pin 3,6,7,8 are

reserved for firmware updating and are 3.3V tolerant.

Absolute Maximum Rating

Voltage range at A or B ………………………………………………. -8V to 12V

Voltage range at pin 3,6,7,8 ……………………………………….. -0.3V to 4V

Electrostatic discharge at A and B ………………………………. ±8kV

RS485 Modbus Parameters

Parameter

Value

Default

address

Baud Rate

19200

Data bits

Parity

Even

Stop bits

TABLE 3-2

Bottom

View

Accusafe Sensor Module User Manual 9 06/21/2021

3.2.2 F-901B MODBUS SPECIFICATIONS

•Operates as a slave, half-duplex mode

•Modbus functions supported:

o0x01 - Read Coils

o0x03 - Read Holding Registers

o0x04 - Read Input Registers

o0x05 - Write Single Coil

o0x06 - Write Single Register

o0x0F - Write Multiple Coils

o0x10 - Write Multiple Registers

•Exception messages supported

•Default address:

oRTU: 50

oTCP/IP: 192.168.1.50

3.2.3 INPUT REGISTERS

Mode: Read-only, size: 16 bits

Name

Address

Description

SENSOR OUTPUT

Gas measurement x 10, ppm

TEMPERATURE

Temperature measurement x 10, C (Note: 16bit

signed number)

RELATIVE HUMIDITY

Relative Humidity measurement x 10, %

BAROMETER

Barometric pressure measurement x 10, mbar

VAPOR PRESSURE

Vapor pressure of water measurement x 10, mbar

ERROR STATUS

0 = OK.

1 = C2H4 offset error, Sensor over-exposed or

KMnO4 filter needs to be replaced.

SENSOR_RAW_VALUE

C2H4 raw measurement, count

DEV_TYPE

100

Default device type ID: 9011

FIRMWARE

101

Firmware version

TABLE 3-3

NOTE:

•Above addresses are offsets. The function address for input register is [30001 + offset]

•Temperature and Humidity are measured at the sensor’s inlet and may not represent room

condition or remote/localized spots. External temperature probe provided in F901B v2 sensor.

Table des matières

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