Operation Manual
MICRO IV
Single Gas Detector
GfG GESELLSCHAFT FÜR GERÄTEBAU MBH▐ KLÖNNESTRASSE 99▐ D-44143 DORTMUND▐ TELEPHONE +49 / (0) 2 31 / 5 64 00 –0 ▐ FAX +49 / (0) 2 31 / 51 63 13
INFO@GFG-MBH.COM ▐ WWW.GASDETECTION.BIZ▐ AMTSGERICHT DORTMUND HR B 2742▐ CERTIFIED AS PER DIN EN ISO 9001:2000▐ ATEX QM CERTIFICATE
Content
Page
Introduction
3 For your Safety
Application and Use
General Description
Detection Principle
Design
3 3 3 3 4 Operational Notes
4 Detection Mode
4 Turning ON
Display Illumination
Peak and Minimum Values, Short-term and Long-term Averages
Turning OFF
Alarm
Alarm Signals
Special Notes for Oxygen Monitoring
Battery
Check of Battery Capacity
Time and Date
Service Mode
4 4 5 5 5 5 6 6 6 7 7 Activation
Confidence Bleep
Zeroing – Adjust Zeropoint – AUTO ZPT
Calibration – Sensitivity Calibration – AUTO CAL
Sensor Replacement
Adjustment by means of Configuration Program
Datalogger
7 7 8 9 10 10 10 Annex
11 Cleaning
Service and Repair
Maintenance and Inspection
Accessories
Spare Parts
Sensor Specification
Alarm Thresholds-Standard Settings and Test Gas Chart
Technical Data
EC-Type Examination Approval
-2-
11 11 11 11 12 13 16 17 18 Introduction
For your Safety
According to § 3 of the law about technical working media, this manual points out the proper use
of the product and serves to prevent dangers. This manual must be carefully read by all
individuals who have or will have the responsibility for using and servicing this product. As any
piece of complex equipment, the GfG MICRO III will do the job designed to do, only, if it is used
and serviced in accordance with the manufacturer's instructions. If the product is not used and
serviced in accordance with the instructions in this manual the warranty will be voided.
Adjustments in the service mode must be done by experts only.
Before operating the detector, use the operational beep to check the battery status, the
alarm signal activation and the readiness for operation.
Bump test must be performed before each day´s use, and calibration at least every 4 months.
The above does not alter statements regarding GfG's warranties and conditions of sale and
delivery.
Application and Use
The MICRO IV is meant for personal safety under atmospheric conditions. It is a pocketsize
detector for your personal protection from gas hazards. The detector is operating continuously in
diffusion mode and gives a visual and audible alarm, if dangerous gas concentrations build up.
The Micro IV is approved for the use in explosion endangered areas and is subject to an EC-Type
Examination Certificate issued by DEKRA EXAM GmbH, according to regulation 2014/34/EU:
Certificate:
Labelling:
DMT 99 ATEX E 044
 II 2G Ex ib IIC T4 resp. T3 Gb -20°CTa+45°C resp.+55°C.
General Description
The MICRO IV is a very small and handy single gas detector. Depending on the sensor it can be
used for monitoring toxic gases, hydrogen or oxygen. The MICRO IV stores long-term and shortterm average values (TWA, STEL). The event logger records, when alarm was triggered, which
kind of alarm was activated (A1, A2, A3, STEL, TWA), and which gas concentration was
measured. An infrared interface allows to transfer data to a PC or to a docking station.
Detection Principle
For measuring toxic gases and oxygen the Micro IV uses electrochemical (EC) sensors.
Electrochemical sensor (EC)
The electrochemical cells contain an electrolyte, a working electrode (anode), a counter electrode
(cathode) and, depending on the sensor type, a reference electrode. The cell is adapted to the
gas to be monitored by specific electrodes and a suitable electrolyte. The electrochemical reaction
generates an electrical signal, which is proportional to the gas concentration. GfG sensor cells are
using the capillary diffusion barrier technology, which, in combination with an additional
temperature compensation, avoids effects caused by changing atmospherical pressure and
temperature.
-3-
Design
Visual alarm
Diffusion inlet
Audible alarm
Battery cover
LCD-Display
Buttons
Rubber cover
Operational Notes
Detection Mode
The detection mode provides various functions, which must be known by the user for proper
operation of the gas monitor MICRO IV.
Turning ON
Turn the MICRO III on before you enter a possibly confined area. Only this makes sure that
accidents caused by gas hazards are prevented. For turning on just insert the battery or, when
the battery is already fit, shortly push key ▲.
At first stage the MICRO III checks, if a valid sensor is fit, and if not, a LED flashes. The display
reads SENS.ERR. This fault report is indicated until a valid sensor is plugged in. Then the
MICRO IV does a complete self-check. Both LEDs light up shortly, and the buzzer sounds for
approx. 1 second. Additionally a test of display segments (switch on of all segments) and the
battery capacity is displayed (see Check of Battery Capacity). The necessary warm-up time of the
sensor is indicated by a countdown in the display (only for the initial activation). Once the selfcheck is completed, the MICRO IV turns to detection mode. The LCD display indicates the gas and
the concentration, e.g.:
Display
0.0 PPM
alternating
0.0 CO
Depending on the parameter setting, either a visual or an audible confidence beep in regular
intervals is activated during the detection mode. This signal proves that the detector is ready for
operation. This signal can be turned on or off (see Confidence Bleep).
Display Illumination
The display illumination will be turned on for approx. 5 seconds by pressing any button shortly.
-4-
Peak and Minimum Values, Short-term and Long-term
Averages
The MICRO IV provides a memory for peak and averages values.Push ▲ to read the minimum
value measured by the oxygen sensor resp. the peak value measured by the TOX sensor. For the
TOX models you can push ▲ again to indicate STEL and TWA values.For OX sensors the display
reads the minimum value first. Pushing ▲ again indicates the peak value.If you do not hit any
key, the detector turns to the standard display mode after 5 seconds without changes.
While the peak or average values are indicated, you can delete the displayed value by pushing
QUIT .The stored value is also deleted by turning the detector off or by removing the battery.
Turning OFF
The current consumption of the MICRO IV is very low. A single AA battery is sufficient for
continous operation of 6 months, depending on alarm and display conditions.
Turn OFF
Press button ▲ approx. 5 seconds
Alarm
Should the gas concentration exceed a pre-set threshold, a visual and audible alarm is triggered
immediately.
The MICRO IV provides several alarm thresholds:
Detectors
for:
Description
Toxic
Gases
AL 1
AL 2
AL 3
STEL
TWA
AL 1
AL 2
AL 3
Oxygen
Alarms Thresholds
Alarm 1,
Alarm 2,
Alarm 3,
Short Term Exposure Limit,
Time Weighted Average,
Alarm 1,
Alarm 2,
Alarm 3,
exceeding
exceeding
exceeding
exceeding
exceeding
falling below
falling below
exceeding








The thresholds AL1, Al2, and AL3 stand for instantaneous concentration alarms. The thresholds
STEL and TWA are exposition alarms that can be adjusted within the configuration program. For
the Short Term Exposure Limit (STEL) a time of 15 minutes will be related and averaged. The
STEL is non-latching. It will turn itself off automatically when falling belowthe STEL threshold. The
Time Weighted Average (TWA) a time of 8 hours of a working shift will be related and averaged.
The TWA alarm cannot be reset. It shuts off only when monitor turned off.
Alarm Signals
The alarms are distinguished by means of different flash and sound frequencies of the visual and
audible alarm signals:
Alarm Audible and Visual Alarm
Alarm Signal
Priority
AL 1
Slow sound and flash frequency
2x
2x
...
low
AL 2,
STEL
Medium sound and flash frequency
4x
4x
...
medium
AL 3,
TWA
Fast sound and flash frequency
8x
8x
...
high
The LCD display indicates the gas and the alarm threshold, e.g.
Display
27.5 AL2
alternating
-5-
27.5 H2S
Special Notes for Oxygen Monitoring
Sour gases like CO2 and SO2 are easily absorbed by the electrolyte of the oxygen sensor. This
results in an increased oxygen signal of e.g. approximately 0.3 % of the measurement value per
1 Vol.-% CO2. The oxygen sensor, therefore, cannot be recommended for continuous
measurement in concentrations above 25 Vol.-% CO2. If the carrier gas is a gas with a molecular
weight, which is different from that for nitrogen, the display values may also be incorrect. There
are no cross sensitivities of the oxygen sensor for toxic gas concentrations within the TLV range.
Battery
The MICRO IV is powered by one 1.5 V AA Mignon alkaline cell. This battery allows a continuous
operation of up to 6 months. The operational time may be reduced by frequent alarms, by display
indication (versions with display) or by activated confidence bleep. This battery has to be
purchased from GfG as the manufacturer. Internal controls ensure the use of batteries prescribed
by the EC-Type Examination Certificate. The correct battery types are:
Duracell PROCELL MN 1500 LR6 AA or INDUSTRIAL
BY
DURACELL ID1500 AA (LR6).
Battery alarm
The MICRO IV monitors the battery voltage permanently and gives a warning, if it falls below the
minimum voltage, which is equivalent to approx. 5% of the battery capacity. A battery alarm is
indicated by an audible warning.
Audible Battery Alarm
Alarm Signal
Fast sound frequency (2 strokes)
2x
6 seconds. pause 2 x.
...
The LCD display indicates the battery capacitiy „XX bAT“, e.g.
Display
5 bAT
The remaining capacity after the first battery alarm allows detection for at least another
15 minutes. For safe operation the battery is to be replaced as soon as possible.
Should the battery voltage become so low that proper functioning is no longer possible, the
detector turns off automatically. The display reads OFF. This reading is shown until the battery is
replaced or until the battery is discharged completely.
Battery Replacement (only in safe area, resp. outside of Ex-areas)
Note
The battery types “Duracell PROCELL MN 1500 LR6 AA” and “INDUSTRIAL BY DURACELL
ID1500 AA (LR6)” must be inserted or replaced in safe areas only. Take care of the
correct polarity when fitting the battery (fit the plus pole first). Once the battery is fit,
the MICRO IV effects a self-check, testing the visual and audible alarms.
Slide battery cover
to the top
Replace battery
For battery replacement slide the battery cover to the top. Then take the old
battery out and replace it by a new one.
Note:
 Use only the approved battery type for operation in hazardous areas!
 Watch out for the correct polarity of the new battery!
 Fit battery with + pole first!
Check of Battery Capacity
The remaining battery capacity is shown after pressing key ▼ shortly.
The capacity is also shown in the LCD display: e.g. 90 bAT = 90% battery capacity
Display
90 bAT
In addition to this the detector effects a self-check as after turning on.
-6-
Time and Date
By pressing key ▼ for approx. 3 seconds the displays shows the time. The date is shown by
pressing again shortly while the time is displayed. The indication is done in the typical format for
your country. Time and date of the Micro IV are programmed automaticly with the docking station
DS220 or by using a configuration adapter. Replacing the battery resets time and date to
01.01.1980 0:00.
Service Mode
In the service mode you can check the confidence beep and the calibration (sensor adjustment).
Adjustment procedures are done by means of the keypad.
Activation
Activation of Service Menu
Press first button QUIT and keep pressed.
Then press button ▼ and press both buttons approx. 3
seconds.
SERVICE
Display
Once you activated the service menu, you can select the individual menu points one after the
other by shortly pressing button ▼ . These menu points are:
Key
Display
Information
QUIT
▼
Press both keys for approx. 3 seconds
SERVICE
Activation of service mode.
▼
BEEP
▼
AUTO ZPT
▼
AUTO CAL
▼
EXIT
▼
Quit Service mode by pressing QUIT
Back to the first option
The relevant menu point is shown in the display. The menu points can be selected with the key
QUIT. The service menu is deactivated by selection of menu point EXIT or automatically after 15
seconds if you do not hit any key.
Confidence Bleep
In the standard setting the alternating display of gas and unit indicates that the detector is
operated in detection mode. An additional audible or visual confidence bleep can be activated,
reminding the user in regular intervals that the detector is working. The confidence bleep interval
is 1 minute. The confidence bleep can also be turned off again.
-7-
Key
Display
Information
QUIT
▼
Press both buttons approx. 3 seconds
SERVICE
Activation of service mode
▼
bEEP
QUIT
Selection of confidence bleep
bEEP OFF
No confidence bleep
Selection with key QUIT
▼
bEEP OPT
Visual confidence bleep LED
Selection with key QUIT
bEEP ACH
Audible confidence bleep loud
Selection with key QUIT
bEEP ACL
Audible confidence bleep
Selection with key QUIT
▼
▼
Back to the first option
Zeroing – Adjust Zeropoint – AUTO ZPT
The adjustment of the zeropoint sets the MICRO IV to its nominal zeropoint value 0. For toxic
gases (e.g. CO, H2S) clean ambient air can be used for the adjustment of the zeropoint. The
nominal value for toxic gases is 0 ppm. To adjust the zeropoint for oxygen, 100.0 % vol nitrogen
is required. During the adjustment of the zeropoint the instantenous value and the type of gas is
displayed alternating with ZPT. If an error occurs during the adjustment, the display shows
ERROR. Possible malfunctions are faulty sensors or gas concentrations beyond the valid
tolerance. In this case please call GfG service. To reset these errors press key QUIT . The
MICRO IV switches back to detection mode after successful adjustment.
Key
Display
Information
QUIT
▼
Press both keys approx. 3 seconds
SERVICE
Activation of service mode.
▼
bEEP
▼
AUTO ZPT
QUIT
Selection of zeropoint adjustment.
0 ZPT
Display of nominal value.
e.g.:
1 CO or 1 H2S
Display of instantaneous value.
Alternating reading until sensor is adjusted or an
error is indicated.
If sensor is adjusted sucessfully, detection is started
automatically.
ZPT ERR
QUIT
Indication of sensor error.
Confirmation of error. Starting detection.
-8-
Calibration – Sensitivity Calibration – AUTO CAL
The sensitivity calibration sets the MICRO IV to a gas specific nominal value. For toxic gas sensors
make sure that a sensitivity calibration is performed before zeropoint adjustment. For sensitivity
calibration the correct test gas is needed.
Test gases are:
For toxic gases, e.g. carbon monoxide (CO), hydrogen sulfide (H2S) etc.
For Oxygen clean ambient air can be used.
For the correct test gas please refer to the test report of your detector.
Calibration procedure:
Put the calibration adapter over the diffusion inlet of the MICRO IV. For avoiding mistakes in
calibration due to gas absorption make sure that the MICRO IV is exposed to a constant test gas flow
for approx. 3 minutes. The flow rate should be 0.5...0.6 l/min.
Before starting the display reads the calibration gas concentration, which can be changed by means of
keys ▼ and ▲. Push key QUIT to start calibration.
Key
Display
Information
QUIT
▼
Press both keys approx. 3 seconds
SERVICE
Activation of service mode.
▼
bEEP
▼
AUTO ZPT
▼
AUTO CAL
QUIT
Selection of sensitivity calibration.
CAL 200
Display of programmable nominal value.
▼,▲
Reduction or increase of nominal value.
QUIT
Starting of sensitivity calibration with nominal value.
200 CAL
Display of nominal value
e.g:
199 CO or 50 H2S
Display of instantaneous value.
Alternating reading until sensor is adjusted
(calibrated) or an error is indicated.
If sensor is adjusted sucessfully, detection is started
automatically.
CAL ERR
QUIT
Indication of sensor error.
Confirmation of error. Starting detection.
The display readings during and after the sensitivity calibration are the same as for the zeropoint
adjustment. Once the sensitivity calibration is completed successfully, the MICRO IV returns to
detection mode automatically.
Attention:
Adjustment of zeropoint or sensitivity calibration can be simplified and automated considerably by
means of the Dockingstation DS220.
-9-
Sensor Replacement
The sensors may only be replaced in safe areas.
Before an expert replaces the sensor, the battery must be removed as described
previously. Slide the battery cover off the casing completely. Now pull the sensor out
and replace it by a new one. Re-assembling is done in reverse order.
Adjustment by means of Configuration Program
The optional configuration program allows to connect the MICRO IV to a PC by means of an
adapter and to change the settings below:










Alarm thresholds (exceeding, falling below, latching)
Alarm activation and deactivation
Blocking of sensor calibration with fresh air and test gas
Storage capacity of event logger from 0 up to 1024 events
Interval of data logger from 30 up to 300 seconds
Readout of event logger and storing data on computer
Readout of data logger and storing data on computer
Calibration gas concentration
Time interval of confidence bleep (6 to 90 seconds)
Different signal adjustments, e.g.: keypad response or confidence beep (off, low, high)
Datalogger
The MICRO IV provides an event and a data logger. The event logger stores 128 events together
with the measured gas concentration. When event 129 occurs, the first (oldest) event will be
overwritten. The data logger is able to store 8685 meaasuring points, this complies to a runtime
of 6 days at an interval of 60 seconds. The data logger is also designed as a loop memory.
The stored data with date and time can be downloaded over a PC with the relevant software
installed.
-10-
Annex
Cleaning
Give the MICRO IV a short sight check after use. Use a damp cloth to remove stains or soiling from
the casing. Never use solvents or cleaning agents!
Service and Repair
Service stands for maintenance, inspection and repair of gas warning equipment. The function test
must be done at leat once a year and checks:
 the charge status of the battery
 the reading at zero gas and standard test gas and, if necessary, the relevant adjustment
 the activation of gas alarms, e.g. with alarm test gas
 the response time
This test has to be done by an expert, and a written confirmation must be filed. In case the Micro
IV needs to be repaired, this has to be done according to the manufacturer’s instructions and
using only genuine spare parts.
Maintenance and Inspection
Maintenance and inspection describe those measures, which retain the nominal status of the MICRO
IV. They include a regular check and adjustment of sensitivity and zeropoint. In addition to this, the
working order of the detector is to be checked as well.
Before safety related measurements are effected, you should do a check which includes:
 the charge status of the battery
 the display with zero gas and with test gas
 the activation of gas alarms
Accessories
Description
Dockingstation 6-fold
Rubber-cover
Leather case
Calibration adapter incl. magnet
Sampling pump
Configuration software with adapter cable for PC
Part No.
1319201
1318214
1318206
1318202
1318215
on request
-11-
Spare Parts
1.
2.
Description
Alkaline-Battery INDUSTRIAL BY DURACELL ID1500 AA (LR6)
Battery cover
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
Ammonia sensor
Ammonia sensor
Ammonia sensor
Ammonia sensor
Ammonia sensor
Chlorine sensor
Chlorine dioxide sensor
Hydrogen chloride sensor
Hydrogen cyanide sensor
Ethylene oxide sensor
Hydro flouoric sensor
Hydro flouoric sensor
Carbon monoxide sensor
Carbon monoxide sensor
Carbon monoxide sensor
Carbon monoxide sensor
Ozone sensor
Phosgene sensor
Phosphine sensor
Oxygen sensor
Sulfur dioxide sensor
Sulfur dioxide sensor
Hydrogen sulfide sensor
Hydrogen sulfide sensor
Silane sensor
Nitrogen dioxide sensor
Nitrogen monoxide sensor
Hydrogen sensor
Hydrogen sensor
Hydrogen sensor
0 .. 200 ppm
0 .. 500 ppm
0 ..1000 ppm
0 .. 200 ppm
0 ..1000 ppm
0 ... 10 ppm
0 … 2 ppm
0 ... 30 ppm
0 ... 50 ppm
0 ... 20 ppm
0... 10 ppm
0 … 10 ppm
0 .. 300 ppm
0 .. 500 ppm
0 …500 ppm
0 ..2000 ppm
0 … 1 ppm
0 … 2 ppm
0 ... 10 ppm
0 .. 25 Vol.%
0 ... 10 ppm
0 ... 50 ppm
0 .. 100 ppm
0 .. 500 ppm
0 ... 40 ppm
0 ... 30 ppm
0 .. 100 ppm
0 .. 2000ppm
0 … 1 Vol.%
0 … 4 Vol.%
NH3
NH3
NH3
NH3
NH3
Cl2
ClO2
(CLO)
HCl
HCN
C2H4O (ETO)
HF
HF
CO
(reduced H2-sensitivity)
CO
(reduced H2-sensitivity)
CO
CO
O3
COCl2 (PGN)
PH3
O2
(2-year sensor)
SO2
SO2
H2S
H2S
SiH4
(SIL)
NO2
NO
H2
H2
H2
Part No.
1318201
1318315
Sensor Type
MK393-5
MK399-5
MK399-6
MK453-5
MK454-5
MK390-5
MK391-5
MK392-5
MK409-5
MK379-5
MK412-5
MK412-6
MK369-5
MK369-6
MK443-5
MK443-6
MK411-5
MK349-5
MK353-5
MK383-5
on request
on request
on request
1318279
1318280
1318246
1318247
1318249
1318255
1318241
1318265
1318271
on request
on request
1318275
1318276
1318257
1318248
1318242
1318266
MK440-5
MK440-6
MK445-5
MK445-6
MK439-5
MK348-5
MK347-5
MK396-5
MK402-5
MK403-5
1318269
1318270
1318277
1318278
1319262
1318238
1318244
1318250
1318258
1318259
Spare parts and accessories should be stored at an ambient temperature of 0 to 30°C. The
storage time should not exceed 5 years. For batteries and sensors shorter storage times of 6
months are valid. When storing oxygen sensors, please note that the expected lifetime is
reduced.
-12-
Sensor Specification
MK347-5 Electrochemical Sensor for Nitrogen monoxide NO
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
Warm-up time:
80...120 kPa:
15%...90% r.h.:
-20...+50°C:
0…100 ppm
3 (2.0) ppm /  1 (0.5) ppm
t90: <30 sec
max. 1ppm or 7% of display (regarding 100 kPa)
max. 1ppm or 7% of display (regarding 50% r.F.)
max. 2ppm or 7% of display (regarding 20°C)
NO2: <30% , H2S: 10% , CO: 0% , SO2: 0% (*1)
2..3 years
3 minutes up to 1 day – depending on time the detector has been turned off
MK348-5 Electrochemical Sensor for Nitrogen dioxide NO2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120 kPa:
15%...90% r.h.:
-20...+50°C:
0…30 ppm
 0.6 ppm / 0.2 ppm
t90: <30 sec
max. 0,3ppm or 5% of display (regarding 100 kPa)
max. 0,3ppm or 5% of display (regarding 50% r.F.)
max. 0,3ppm or 5% of display (regarding 20°C)
Cl2: 100% , H2S: % , CO: 0% , SO2: 0% , NO: 0% (*1)
3 years
MK349-5 Electrochemical Sensor for Phosgene COCl2 (CLO)
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120 kPa:
10%...95% r.h.:
-20...+40°C:
0…2 ppm
 0.02 ppm / 0.01 ppm
t90: <150 sec
max. 0,02ppm or 10% of display (regarding 100 kPa)
max. 0,02ppm or 10% of display (regarding 50% r.F.)
max. 0,02ppm or 10% of display (regarding 20°C)
ClO2: -300%, HCl: 250%, AsH3: 90%, Cl2: 40%, NO2: -10%, O3: 10%
1..1,5 years
(*1)
MK353-5 Electrochemical Sensor for Phosphine PH3
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
0…10 ppm
0.05 ppm / 0.05 ppm
80...120 kPa:
15%...90% r.h.:
-20...+50°C:
t90: <90 sec
max. 0,05ppm or 10% of display
max. 0,05ppm or 10% of display
max. 0,05ppm or 10% of display
SiH4:90%, GeH4: 90%, AsH3: 65%,
2..3 years
(regarding 100 kPa)
(regarding 50% r.F.)
(regarding 20°C)
Cl2: 40%, NO2: -10%, O3: 10% (*1)
MK369-5 /-6 Electrochemical Sensor for Carbon monoxide CO
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities::
Expected lifetime:
0…300 ppm / 500 ppm
3 ppm
80...120 kPa:
15%...90% r.h.:
-20...+50°C:
T50: <20 sec
T90: <50 sec
max. 3ppm or 10% of display (regarding 100 kPa)
max. 3ppm or 10% of display (regarding 50% r.F.)
max. 3ppm or 15% of display (regarding 20°C)
H2: <10% , NO: <9% , H2S: 0% , SO2: 0% (*1)
2..3 years
MK379-5 Electrochemical Sensor for Ethylene oxide C2H4O (ETO)
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
0…20 ppm
0.3 ppm / 0.1 ppm
80...120 kPa:
15%...90% r.h.:
0...+30°C:
-20...+50°C:
Cross sensitivities:
Expected lifetime:
Warm-up time:
t90: <120 sec
max. 1ppm or 15% of display (regarding 100 kPa)
max. 2ppm or 15% of display (regarding 50% r.F.)
max. 1ppm or 15% of display (regarding 20°C)
max. 2ppm or 20% of display (regarding 20°C)
CO: % , CH4O: % , C2H2: % , CH2O: % , CH4S: % , C2H4: % , C2H6O: 5% ,
C4H10O: % , C7H8: 0% , MEK: 0% u.a. (*1)
2..3 years
4 minutes up to 7 days – depending on time the detector has been turned off
MK 383-5 Electrochemical Sensor for Oxygen O2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Expected lifetime:
0…25 vol. %
0.3 vol. % / 0.1 vol. %
80...120 kPa:
0%...99% r.h.:
-20...+50°C:
t20: <8 sec
T90: <20 sec
max. 0,2Vol.% or 2,5% of detection range (regarding 100 kPa)
max. 0,2Vol.% or 2,5% of detection range (regarding 50% r.F.)
(regarding 20°C)
max. 0,5Vol.% or 2,5% of display
2 years in air
MK390-5 Electrochemical Sensor for Chlorine Cl2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
0…10 ppm
0.1 ppm / 0.1 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
t90: <30 sec
max. 0,2ppm or 10% of display (regarding 100 kPa)
max. 0,2ppm or 10% of display (regarding 50% r.F.)
max. 0,2ppm or 10% of display (regarding 20°C)
ClO2: 5% , F2: 40% , NO2: 20% , O3: 20%, SO2: 18% , CO2: 0% , H2S: 0% , H2: 0% (*1)
2..3 years
-13-
MK391-5 Electrochemical Sensor for Chlorine dioxide ClO2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
0…2 ppm
0.03 ppm / 0.01 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
t90: <120 sec
max. 0,05ppm or 10% of display (regarding 100 kPa)
max. 0,05ppm or 10% of display (regarding 50% r.F.)
max. 0,05ppm or 10% of display (regarding 20°C)
Cl2: 6% , O3: -280% , H2S: -25% , H2: 0% , CO: 0% (*1)
1..2 years
MK392-5 Electrochemical Sensor for Hydrogen chloride HCl
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
0…30 ppm
0.4 ppm / 0.2 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
Expected lifetime:
t90: <90 sec
max. 1ppm or 10% of display (regarding 100 kPa)
max. 1ppm or 10% of display (regarding 50% r.F.)
max. 1ppm or 10% of display (regarding 20°C)
AsH3: 350% , PH3: 300% , H2S: 65% , NO: 45% , SO2: 40% , HCN:35% , Cl2: 6% , NO2: 3% , NH3: 0.1% , CO: 0% ,
(*1)
CO2: 0% , H2: 0%
2..3 years
MK393-5 Electrochemical Sensor for Ammonia NH3
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
MK396-5
0…200 ppm
3 ppm / 1 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
t90: <60 sec
max. 1ppm or 10% of display (regarding 100 kPa)
max. 1ppm or 10% of display (regarding 50% r.F.)
max. 1ppm or 15% of display (regarding 20°C)
H2S: 10% , CO: 0% , CO2: 0% , H2: 0% (*1)
2..3 years
Electrochemical Sensor for Hydrogen H2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
(*2)
0…2000 ppm
50 ppm / 2 ppm
80...120 kPa:
15%...90% r.h.:
-20...+50°C:
t90: <90 sec
max.  5ppm or 10% of display (regarding 100 kPa)
max.  5ppm or 10% of display (regarding 50% r.F.)
max. 10ppm or 20% of display (regarding 20°C)
C2H4:80% , NO: 35% , HCN: 30% , CO: 20% , H2S: 20%, NO2=SO2=Cl2=HCl=0% (*1)
2..3 years
MK399-5 / -6 Electrochemical Sensor for Ammonia NH3
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
MK402-5
10 ppm / 5ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
t90: <90 sec
max.  5ppm or 10% of display (regarding 100 kPa)
max.  5ppm or 10% of display (regarding 50% r.F.)
max. 10ppm or 20% of display (regarding 20°C)
NO2:65% , H2S:60% , Cl2:20% , SO2:-10%, CO=NO=H2=0%
2..3 years
Electrochemical Sensor for Hydrogen H2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
MK403-5
0…500 ppm / 1000 ppm
(*2)
0…1 vol. %
0.02 vol. % / 0.01 vol. %
80...120 kPa:
10%...90% r.h.:
-20...+50°C:
t90: <90 sec
max. 0,01Vol.% or 10% of display (regarding 100 kPa)
max. 0,01Vol.% or 10% of display (regarding 50% r.F.)
max. 0,02Vol.% or 20% of display (regarding 20°C)
NO2:-400% , CO:150% , H2S:20% , C2H4:yes , NH3=CO2=Cl2=SO2=HCN=0%
2..3 years
Electrochemical Sensor for Hydrogen H2
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
(*1)
(*1)
(*2)
0…4 vol. %
0.05 vol. % / 0.01 vol. %
80...120 kPa:
10%...90% r.h.:
-20...+50°C:
t90: <90 sec
max. 0,01Vol.% or 10% of display (regarding 100 kPa)
max. 0,01Vol.% or 10% of display (regarding 50% r.F.)
max. 0,02Vol.% or 25% of display (regarding 20°C)
H2S: 220% , C2H4: yes , CO: 0% (*1)
2..3 years
MK409-5 Electrochemical Sensor for Hydrogen cyanide HCN
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
0…50 ppm
1.5 ppm / 0.5 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
t90: <60 sec
max. 0,5 ppm or 10% of display (regarding 100 kPa)
max. 0,5 ppm or 10% of display (regarding 50% r.F.)
max. 0,5 ppm or 15% of display (regarding 20°C)
NO2: -70% , NO: -5% , H2S: 0…200% (according to filter saturation), CO=CO2=H2=0%
2 years
MK411-5 Electrochemical Sensor for Ozone O3
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
0…1 ppm
0.02 ppm / 0.01 ppm
80...120 kPa:
10%...95% r.h.:
-10...+45°C:
t90: <60 sec
max. 0,03 ppm or 10% of display (regarding 100 kPa)
max. 0,03 ppm or 10% of display (regarding 50% r.F.)
max. 0,03 ppm or 15% of display (regarding 20°C)
ClO2: 150% , Cl2: 120% , NO2: 60% , H2: 0% , H2S: -8% (*1)
2 years
-14-
(*1)
MK412-5 / 6 Electrochemical sensor for Hydrogen fluoride HF
Max. detection range
T-Band
Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120 kPa:
10%...80% r.h.:
-20...+40°C:
0…10 ppm
0.3 ppm / 0,5ppm with MK412-6
0.1 ppm / 0,5ppm with MK412-6
t50: <40 s t90: <90 s
Max. 0,2ppm or 10% of display (related to 100 kPa)
max. 0,2ppm or 10% of display (related to 50% r.h.)
max. 0,2ppm or 10% of display (related to 20°C)
(*1)
Cl2% , NO2>1% , CO=CO2=H2S=H2=0%
1..2 Years
MK439-5 Electrochemical Sensor for Silane SiH4 (SIL)
Max. detection range
T-Band / Resolution
Response time
Pressure
Humidity
Temperature
Cross sensitivities:
0…40 ppm
0.2 ppm / 0.1 ppm
80...120 kPa:
10%...95% r.h.:
-20...+50°C:
Expected lifetime:
t90: <60 sec
max. 0,1ppm or 10% of display (regarding 100 kPa)
max. 0,2ppm or 10% of display (regarding 50% r.F.)
max. 0,3ppm or 10% of display (regarding 20°C)
PH3:175% , B2H6:135% , AsH3:125% , H2S:45% , SO2:40% , H2Se:25% , NO2:23% , Cl2:12% , HCN:6% , HCl:5% ,
CO=H2=HF=0%
(*1)
2..3 years
MK440-5 /-6 Electrochemical Sensor for Sulfur Dioxide SO2
Max. detection range:
Resolution:
T-Band:
Response time:
Pressure
Humidity
Temperature
Cross sensitivities:
80...120kPa:
15%...90% r.F.:
-20...+50°C:
Expected lifetime:
0...10ppm / 50ppm
0,1ppm
0,2ppm
t90 <30 sec
max. 0,2ppm or 5% of display (regarding 100kPa)
max. 0,3ppm or 3% of display (regarding 50% r.F.)
max. 0,3ppm or 5% of display (regarding 20°C)
C2H2:<300% , NO2:<-170% , C2H4:<90% , HCN:<50% , Cl2:<-40% , NO:<10% ,
CO:<0,5% , H2S:<0,5%, H2:<0,5% , NH3:0% (*1)
3 years
MK443-5 /-6 Electrochemical Sensor for Carbon Monoxide CO
Max. detection range:
Resolution:
T-Band:
Response time:
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120kPa:
15%...90% r.F.:
-20...+50°C:
0...500ppm / 2000ppm
1ppm
3ppm
t50 < 10sec
t90 ≤30 sec
(regarding 20°C)
(regarding 100kPa)
max. 3ppm or 10% of display
(regarding 50% r.F.)
max. 3ppm or 5% of display
max. 3ppm or 5(10)% of display (regarding 20°C)
C2H4:96%; C2H2:90%; H2<30% (typ. 15%); NO<20%; Cl2<7%; C2H6O<0,5%; SO2=NH3=H2S=0%
3 years
(*1)
MK445-5 /-6 Electrochemical Sensor for Hydrogen sulphide H2S
Max. detection range:
Resolution:
T-Band:
Response time:
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120kPa:
15%...90% r.F.:
-20...+50°C:
0...100ppm / 500ppm
0,1ppm / 0,5ppm
0,5ppm / 1,0ppm
t50 < 10sec
t90 < 30 sec
(regarding 100kPa)
max. 0,2ppm or 5% of display
(regarding 50% r.F. @ 20°C)
max. 0,2ppm or 5% of display
max. 0,2ppm or 5(10)% of display (regarding 20°C)
NO2<10%, CO<2%, NO<1%, CO2=SO2=Cl2=NH3=C2H4=0%, low methanol cross sensitivity
3 years
(*1)
MK453-5 Electrochemical Sensor forAmmonia NH3
Max. detection range:
Resolution:
T-Band:
Response time:
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120kPa:
15%...90% r.F.:
-20...+50°C:
0...200ppm
1ppm
3ppm
t90 < 45 sec
(regarding 100kPa)
max. 1ppm or 10% of display
(regarding 50% r.F.)
max. 1ppm or 10% of display
max. 1(2)ppm or 15(20)% of display (regarding 20°C)
H2S: 120%, NO2 -100%, SO2: -30%, CO=NO=CO2=H2=C2H4O=0%
2..3 years
(*1)
MK454-5 Electrochemical Sensor for Ammonia NH3
Max. detection range:
Resolution:
T-Band:
Response time:
Pressure
Humidity
Temperature
Cross sensitivities:
Expected lifetime:
80...120kPa:
15%...90% r.F.:
-20...+50°C:
0...1000ppm
5ppm
10ppm
t90 < 60 sec
(regarding 100kPa)
max. 5ppm or 10% of display
(regarding 50% r.F.)
max. 5ppm or 10% of display
(regarding 20°C)
max. 10ppm or 20% of display
H2S: 140%, NO2 -100%, SO2: -30%, CO=NO=CO2=H2=C2H6O=0%
2...3 years
(*1)
(*1): Displayed value with reference to the supplied gas concentration, which lies in the range of the TLV value
(*2): Not approved for monitoring of the lower explosion limit for applications of the primary explosion protection.
-15-
Alarm Thresholds-Standard Settings and Test Gas Chart
Instantaneous alarms following TRGS 900 (Version 2000)
Detection range
25,0 Vol.% O2
1,00/4,00 Vol.%
2000 ppm
1000/2000 ppm CO
300/500 ppm CO
500 ppm H2S
100 ppm H2S
10 ppm HF
200 ppm NH3
500/1000 ppm NH3
100 ppm NO
10,0/50,0 ppm SO2
50,0 ppm HCN
30,0 ppm HCl
20,0 ppm C2H4O
40,00 ppm SiH4
10,00 ppm PH3
1,00 ppm COCl2
100,0 mg/m3 C4H8S
30,0 ppm NO2
10,0 ppm Cl2
1,00 ppm O3
2,00 ppm ClO2
Alarm 1 Alarm 2
Oxygen
H2 Hydrogen (*2)
H2 Hydrogen (*2)
Carbon monoxide
Carbon monoxide
Hydrogen sulphide
Hydrogen sulphide
Hydrogen fluoride
Ammonia
Ammonia
Nitrogen monoxide
Sulphur dioxide
Hydrogen cyanide
Hydrogen chloride
Ethylene oxide (ETO)
Silane (SIL)
Phosphine
Phosgene (PGN)
Tetrahydrothiophen (THT)
Nitrogen dioxide
Chlorine
Ozone
Chlorine dioxide
19,0 
0,20 (*2)
1000 (*2)
30
30
10,0
5,0
1,0
20
50
25
1,0
10,0
5,0
2,0 (*3)
5,00
0,30 (*3)
0,10 (*3)
25,0
5,0
0,5
0,10
0,10
17,0 
0,40 (*2)
1500 (*2)
60
60
20,0
10,0
2,0
40
100
50
2,0
20,0
10,0
4,0
10,00
0,40 (*3)
0,20 (*3)
50,0
10,0
1,0
0,20
0,20
Alarm 3
23,0 
0,60 (*2)
2000 (*2)
300
300
100,0
100,0
10,0
200
200
100
10,0
50,0
30,0
20,0
20,00
10,00
1,00
100,0
30,0
10,0
1,00
1,00
STEL
(15`)
TWA
(8h)
Cal.-Gas
20,9
1,00
1000
400
200
100
50
10,0
100
200
50
10,0
50,0
10,0
20,0
5,00
5,00
1,00
37,0
20,0
5,0
0,70
1,00
(*2): Not approved for monitoring of the lower explosion limit for applications of the primary explosion protection.
(*3): A reliable TLV (threshold limit value) monitoring is not possible with the sensor technology currently available.
-16-
Technical Data
Detector type:
Detection principle:
Detection ranges:
Response time t90:
Expected sensor life:
Climatic effects:
Display:
Alarm:
Gas supply:
Zeropoint/Calibration:
Climate conditions:
MICRO IV
electrochemical sensor (EC)
see section „Type of Sensors and Detection Ranges“
see section „Sensor Specification“
see section „Sensor Specification“
see section „Sensor Specification“
LCD Display with backlight illumination
Visual and audible warning
3 instantaneous concentration alarms and 2 exposition alarmssee section
„Basic Adjustment of Alarm Thresholds“
Diffusion
With calibration adapter at a flow rate of 0.5...0.6 l/min
for operation:
Power supply:
-20...+55(45)°C / 5...95% r.h. / 80...120 kPa
see section „Sensor specification“
for storage: -25...+55°C
/ 10...95% r.F. / 70...130 kPa (recomm. 0...+30°C)
1 AA Mignon 1,5V Type: DURACELL PROCELL MN1500 LR6 AA
or INDUSTRIAL BY DURACELL ID1500 AA (LR6)
Operational time: 6 months, maybe reduced depending on alarm frequency
Casing
Casing material:
Dimensions:
weight: min
max
Protection:
Polycarbonate, metalised
47 x 88 x 25 mm (WxHxD)
61 g -Model without display, without keypad, with CO sensor
85.6 g –Model with display, with keypad, with O2 sensor
IP54
Approval:
Electromagnetic Compatibility:
Labelling and ignition protection:
DIN EN 50270:2006 Type class 1 and Type class 2
Only when used with DURACELL PROCELL MN1500 LR6 AA or
INDUSTRIAL BY DURACELL ID1500 AA (LR6)
 II 2G EEx ib IIC T4 resp. T3 Gb -20°CTa+45°C resp.+55°C
When using the pump (see accessories) the detector unit is subject to the
temperature classification for the MICRO IV.
EC type approval:
Production supervision:
DMT 99 ATEX E 044
 0158 (by notified body - DEKRA EXAM)
GfG Gesellschaft für Gerätebau mbH
D-44390 Dortmund
Phone: +49-(0)231-56400 0 Fax: +49-(0)231-516313
E-Mail: info@gfg.biz
Internet: www.gasdetection.biz
Worldwide Supplier of
Gas Detection Solutions
180-000.53_OM_MICRO_IV.doc Edition 21. April 2016
Firmware Version 2.29
We reserve the right of modification
-17-
EC-Type Examination Approval
-18-
-19-
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