Felix Storch F-901B Manuale utente

July 2019

F-901B Reference

Manual

Version 1.4

6/15/16

1554 NE 3rd Ave, Camas, WA 98607, USA

Phone: (360) 833-8835

www.felixinstruments.com

F-901B Reference Manual 
Page 1of 15 
 
Table of Contents 
IMPORTANT SAFEGUARDS ................................................................................................................................................2 
F-901B Specifications.........................................................................................................................................................3 
Instrument Overview.........................................................................................................................................................4 
Cables and Tubes Installation............................................................................................................................................4 
Cables Assembly ................................................................................................................................................................5 
Principle of Operation .......................................................................................................................................................6 
Flow cycle ......................................................................................................................................................................6 
Operating modes...........................................................................................................................................................6 
MODBUS............................................................................................................................................................................7 
RTU RS485 Configuration ..............................................................................................................................................7 
Pin Description...............................................................................................................................................................7 
Absolute Maximum Rating ............................................................................................................................................8 
RS485 Modbus Parameters ...........................................................................................................................................8 
F-901B MODBUS Specifications.....................................................................................................................................8 
Input Registers...........................................................................................................................................................8 
Holding Registers.......................................................................................................................................................9 
Coils .........................................................................................................................................................................10 
Maintenance of the F-901B.............................................................................................................................................11 
Replacing the Ethylene (C2H4), Oxygen (O₂) Sensor and Potassium Permanganate Filter (KMnO4).........................11 
Calibration ...................................................................................................................................................................13 
User calibration .......................................................................................................................................................13 
Warranty Information .....................................................................................................................................................14 
Warranty Registration Card.............................................................................................................................................15 
 
 
 

F-901B Reference Manual

Page 2of 15

IMPORTANT SAFEGUARDS

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.

See Cables Assembly.

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

device. Power connector will not make connection to GND if not fully plugged into the socket.

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

operating. Use the included hydrophobic filter to prevent liquid water from entering device. See

Cables and Tubes Installation.

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

damage the internal micropump.

•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 sensor Specifications.

•Lifetime of up to 2 years for C2H4/O2 sensor and 5 years for CO2 sensor can be expected for

discontinuous sampling. Continuous exposure to relative humidity >90% or <15% and Volatile

Organic Compounds (VOCs) over a long period of time must be avoided. See Operating mode.

F-901B Reference Manual

Page 3of 15

F-901B Specifications

Measurements

C2H4, CO2, O2, RH, Temperature, Barometric Pressure

Air Sampling Rate

120 mL/min in Continuous Mode

Measuring Rate

1-second intervals in Continuous Mode

Communication

Modbus via RS485, RJ45 connector

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

172mm x 103mm x 55mm

Weight

0.98kg

Enclosure

Powder-coated aluminum

Ethylene (C2H4) sensor

Type

Electrochemical

Nominal Range

0-1000 ppm

Accuracy

±5% ± 5ppm

Lower Detection Limit

2 ppm

Response Time (T90)

< 3 minutes

Temperature Range

0 °C to 50 °C

Pressure Range

1013mbar ± 10 %

Relative Humidity Range

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

Long Term Output Drift

< 5 % per month in continuous exposure

Lifetime

2 years

Carbon Dioxide (CO2) sensor

Type

NDIR (non‐dispersive infrared)

Nominal Range

0-100%

Accuracy

±3% ± 300ppm

Lower Detection Limit

100ppm

Response Time (T90)

< 20s

Warm Up Time

< 1 minute

Pressure Range

950mbar to 10000mbar

Temperature Range

0 °C to 50 °C

Relative Humidity Range

0 to 90 % R.H. non-condensing

Lifetime

5 years

Oxygen (O2) Sensor

Type

Electrochemical

Nominal Range

0-100%

Accuracy

±2% ± 100ppm

Lower Detection Limit

0.1%

Response Time (T90)

< 5s

Temperature Range

0 °C to 50 °C

Pressure Range

500mbar to 2000mbar

Relative Humidity Range

0 % to 99 % R.H. non-condensing

Lifetime

2 Years

F-901B Reference Manual

Page 4of 15

Instrument Overview

Cables and Tubes Installation

IMPORTANT:

•USE ONLY SPECIFIED POWER PLUG AND CABLE CAP

•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

•USE HYDROPHOBIC FILTER DURING SAMPLING TO PROTECT THE SENSOR FROM CONDENSATION

Waterproof Power Plug

Waterproof Cable Cap

Hydrophobic Filter

Luer-type Fitting

Lock Ring

12V Power Input

LED

ModBus Communication Port

Gas Inlet

Gas Outlet

Mounting Holes*

*accepts M5 or #10 screw

F-901B Reference Manual

Page 5of 15

Cables Assembly

Connector Mating Parts (not supplied):

Part number

Description

Manufacture

767KS12

DC Power Plug Sealed IP68

Switchcraft

630125673867

Patch Cable Cap IP67 water and dust

protection

InstallerParts

Lock Ring

12VDC

GND

Plug handle

RJ45 Male Plug*

Waterproof Cap

*See Pin Description for correct wiring

F-901B Reference Manual

Page 6of 15

Principle of Operation

Flow cycle

There are two flow cycles during the F-901B operation:

•Sampling Cycle: air from inlet port is pulled into sensors chamber by a micropump, then expelled out to the

outlet port.

•Cleaning Cycle: Air is circulated inside the F-901B through the sensor and filter chamber. Sensors are now

isolated from the outside air.

Operating modes

•Trigger measurement mode: during this mode, device alternates between sampling (Figure 1) and

cleaning cycles (Figure 2). Sampling cycle lasts for 35 seconds then immediately followed by cleaning cycle

for 30 seconds. The whole routine will then repeat after some idle time. Final sensor readings are updated

at the end of sampling cycle and remain the same until the next update (see TRIGGER_INTEVAL). Use this

measurement mode to increase sensors lifetime and prevent baseline drift, especially when operating in

high VOC/humidity environments. The rule of thumb is the less exposure, the longer sensor lifetime. This

is the default operating mode (5-minutes interval).

•Continuous measurement mode: during this mode, air is sampling continuously as shown in Figure 1.

Sensor readings are updated every second. Note: Do NOT use this mode for long exposure applications.

PUMP

SENSORS

FILTER CHAMBER

OUT

F-901B

PUMP

SENSORS

FILTER CHAMBER

F-901B

Figure 2 cleaning cycle

Figure 1 sampling cycle

F-901B Reference Manual

Page 7of 15

MODBUS

The F901B supports the standard Modbus protocol in both RTU and TCP/IP mode:

•TCP/IP: the factory default mode. Upon powering up, the F901B initializes the Modbus TCP/IP protocol via

the default static IP address 192.168.1.50 port 502 (This address is configurable via Modbus commands).

•RTU: The F901B sensor can be configurated to operating in RTU (RS485) mode by setting the

MODBUS_MODE register and swapping the internal cables inside the sensor. See below for RTU

specifications.

RTU RS485 Configuration

Pin Description

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

Note: 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.

Sampling cycle

Cleaning cycle

Trigger interval

idle time

8 7 6 5 4 3 2 1

RJ-45

Plug

RJ-45

Socket

1 2 3 4 5 6 7 8

Figure 3 Trigger measurement timing

F-901B Reference Manual

Page 8of 15

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

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

Input Registers

Mode: Read-only, size: 16 bits

Name

Address

Description

C2H4

C2H4 measurement x 10, ppm

CO2

CO2 measurement x 100, %

O2 measurement x 10, %

TEMPERATURE

Temperature measurement x 10, C

RELATIVE HUMIDITY

Relative Humidity measurement x 10, %

BAROMETER

Barometric pressure measurement x 10, mbar

VAPOR PRESSURE

Vapor pressure measurement x 10, mbar

ERROR STATUS

0 = OK.

1 = C2H4 offset error, Sensor over-exposed or KMnO4 filter

needs to be replaced.

C2H4_RAW

C2H4 raw measurement, count

O2_RAW

O2 raw measurement, count

F-901B Reference Manual

Page 9of 15

DEV_TYPE

100

Default device type ID: 9011

FIRMWARE

101

Firmware version

Holding Registers

Mode: Read/Write, size: 16 bits

Name

Address

Default

Description

PUMP_POWER

Internal pump power 0-100%

C2H4_SPAN

C2H4 span calibration parameter, calculated as follow:

C2H4_SPAN = C2H4_CUR*C2H4_SPAN_CUR/C2H4_CAL

Note: C2H4_CAL: expected calibration concentration

C2H4_SPAN_CUR: Current span value

C2H4_CUR: Current C2H4 measurement

C2H4_ZERO

C2H4 zero calibration parameter

O2_SPAN

O2 span calibration parameter, calculated as follow:

O2_SPAN = O2_CUR*O2_SPAN_CUR/O2_CAL

Note: O2_CAL: expected calibration concentration

O2_SPAN_CUR: Current span value

O2_CUR: Current O2 measurement

O2_ZERO

O2 zero calibration parameter

CO2_SPAN

CO2 span calibration parameter, calculated as follow:

CO2_SPAN = CO2_CAL*CO2_SPAN_CUR/CO2_CUR

Note: CO2_CAL: expected calibration concentration

CO2_SPAN_CUR: Current span value

CO2_CUR: Current CO2 measurement

CO2_ZERO

CO2 zero calibration parameter

TRIGGER_INTERVAL

Interval between Trigger measurements in seconds.

Writing a value greater than 0 to this register enables

Trigger mode (see Operating modes). Writing a 0 to this

Continuous mode after finishing any on-going Trigger

measurement). Note that a single Trigger mode

measurement takes at least 65 seconds.

SLAVE_ADDR

Device Modbus RTU slave address. Update this register

to change the slave address. Valid slave addresses: 0-99

MODBUS_MODE

0: TCP/IP (LED blinks 2 times at boot)

1: RTU (LED blinks 3 times at boot)

2: Auto Config Mode. During boot up, if the internal

TCP/IP cable is plugged in and the device is connected to

active ethernet hub/router or the F901C Controller, the

device will select TCP/IP mode. Otherwise, RTU mode is

selected.

IP_ADDR0

192

Device IP address

IP_ADDR1

168

Device IP address

IP_ADDR2

Device IP address

IP_ADDR3

Device IP address

IMPORTANT:backup calibration parameters before overwriting their values (performing a calibration) or update

device firmware (all parameters will be erased). All F-901B comes with factory calibration using standard certified

gases.

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