MSR ELECTRONIC PolyGard 2 Manuale utente

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

PolyGard2 / µGard2 Sensors for Toxic Gases

Sensor Cartridge for Toxic Gases (and Oxygen)

Series: SC2 and MC2 Series

User Manual

August 2020

Up-to-date data sheets and user manuals can be found in the download area of www.msr-24.com.

User Manual - PolyGard®2 / µGard®2 
Sensors for Toxic Gases 
 
 
Page 2 
 
 
 
PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820 
 
Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice 
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de 
 
1Functional Description........................................................................................................................ 3 
1.1 General ................................................................................................................................................................. 3 
1.2 Measuring Mode................................................................................................................................................. 3 
1.3 Special Mode....................................................................................................................................................... 3 
1.4 Sensor Element for Toxic Gases and Oxygen.............................................................................................. 3 
2Installation.......................................................................................................................................... 4 
2.1 Mounting Instructions....................................................................................................................................... 4 
3Electrical Connection .......................................................................................................................... 5 
3.1 Plug Connection (SC2) in SB2, MSB2, MSC2, WSB2 ................................................................................... 5 
3.2 Terminal Connection (MC2)............................................................................................................................. 5 
4Commissioning ................................................................................................................................... 5 
4.1 Installation of Sensor Cartridge ..................................................................................................................... 5 
4.2 Registration of the Sensor Cartridge............................................................................................................. 5 
5Calibration .......................................................................................................................................... 6 
5.1 Calibration Work ................................................................................................................................................ 6 
5.2 Exchange of Sensor Cartridge......................................................................................................................... 7 
6Inspection and Service ........................................................................................................................ 8 
6.1 Inspection ............................................................................................................................................................ 8 
6.2 Service and Calibration .................................................................................................................................... 8 
7Troubleshooting ................................................................................................................................. 9 
7.1 Indicators at the SC2 ......................................................................................................................................... 9 
7.2 Indicators at the MC2 ........................................................................................................................................ 9 
7.3 Sensor Board (PCB) ............................................................................................................................................ 9 
7.4 Sensor Cartridge (Messages at the Tool / Controller)............................................................................... 9 
8Cross-sensitivity Data ....................................................................................................................... 10 
9Technical Data................................................................................................................................... 10 
9.1 MC2......................................................................................................................................................................10 
9.2 Sensor Cartridge (SC2)....................................................................................................................................11 
9.3 Sensor Element.................................................................................................................................................12 
10 Figures .............................................................................................................................................. 14 
11 Part Disposal ..................................................................................................................................... 15 
12 Notes and General Information......................................................................................................... 15 
12.1 Intended Product Application...................................................................................................................15 
12.2 Installers’ Responsibilities ........................................................................................................................15 
12.3 Maintenance..................................................................................................................................................15 
12.4 Limited Warranty .........................................................................................................................................15 
 

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 3

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

Intended Use

The PolyGard2 sensors (SC2) are designed for the measurement of toxic gases and oxygen in a wide range

of applications only in connection with a basic unit, e.g. SB2, MSC2, MSB2 and WSB2 of the PolyGard2

series.

The MC2 sensor (µGard2) is operated with 24 V DC and outputs an analog 4–20 mA standard signal.

The PolyGard2 / µGard2 sensors must not be used in potentially explosive atmospheres. The sensor must

only be employed in areas within the environmental conditions as specified in the Technical Data.

1Functional Description

1.1 General

The Sensor Cartridge includes a µController for measurement value processing in addition to the gas sensor

element and the measuring amplifier. All data and measured values of the sensor element are stored in a

fail-safe way in the µController and are digitally transferred via the local bus to the basic unit (PCB). The

calibration management is also integrated in the µController of the Sensor Cartridge.

The Sensor Cartridge SC2 is connected to the SB2 / MSB2 / MSC2 / WSB2.

The µCartridge MC2 works according to the same principle as the SC2 series with the exception that the MC2

outputs an analog signal of 4–20 mA (2–10 V as an option).

1.2 Measuring Mode

See description of the SB2, MSC2, MSB2 and WSB2 devices.

1.3 Special Mode

See description of the SB2, MSC2, MSB2 and WSB2 devices.

1.4 Sensor Element for Toxic Gases and Oxygen

The sensor element is a sealed electro-chemical cell with three electrodes, sensing, reference and counter or

with two electrodes, sensing and reference. The ambient air to be monitored diffuses through a membrane

filter into the liquid electrolyte of the sensor. The chemical process of the measurement is one of oxidation

where one molecule of the target gas is exchanged for one molecule of oxygen. The reaction drives the

oxygen molecule to the counter electrode, generating a DC microampere signal between the sensing and

reference electrodes. This signal is linear to the volume concentration of the sensed gas. The signal is

evaluated by the connected amplifier and transformed into a linear output signal.

Electrochemical processes always lead by-and-by to a loss of sensitivity. Therefore, regular calibration of

zero-point and gain is necessary. See section 5.

There is a small quantity of corrosive liquid in the sensor element. If in case of damage persons

or objects touch the liquid, you have to clean the affected areas as fast and carefully as possible

with tap water. Out of use sensors must be disposed in the same way as batteries.

Certain substances and gases in the ambient air to be monitored can affect the sensitivity of the

sensor element or destroy the sensor completely. This is called poisoning.

The following are currently known:

•Polymerising substances, such as ethylene oxide, acrylonitrile, butadiene, styrene, silicone and

silicon vapours

•Corrosive substances, such as halogenated hydrocarbon.

•Catalytic poisons, such as sulphur and phosphor compounds, silicon compounds, metal vapours

•Organic solvents

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 4

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

2Installation

Electronics can be destroyed by electrostatic discharge (ESD). Therefore the installation work

should be done only by persons connected to ground, e. g. by standing on a conductive floor or

by taking appropriate grounding measures (acc. to DIN EN 100015).

2.1 Mounting Instructions

See description of the SB2, MSC2, MSB2 and WSB2 devices.

When choosing the mounting site please pay attention to the following:

•The mounting height depends on the relative density of the gas type to be monitored.

Gas type

MSR-Code

Relative density

(air = 1)

Recommended mounting height

(distance to floor / ceiling)

Ammonia

E1125

0.60

Ceiling (0.3 m)

Chlorine

E1193

2.48

Floor (0.2–0.3 m)

Hydrogen chloride

E1186

1.27

Floor (0.2–0.3 m)

Hydrogen cyanide

E1183

0.93

Ceiling (0.3 m)

Ethylene oxide

E1199

1.56

Floor (0.2–0.3 m)

Ethylene

E1189

0.97

1.5–1.8 m

Formaldehyde

E1185

1.04

1.5–1.8 m

Carbon monoxide

E1110

0.97

1.5–1.8 m

Ozone

E1190

1.66

Floor (0.3 m)

Sulphur dioxide

E1196

2.73

Floor (0.2–0.3 m)

Hydrogen sulphide

E1197

1.19

Floor (0.2–0.3 m)

Nitrogen dioxide

E1130

2.80

0.5–1.8 m

Oxygen

E1195

1.11

1.5–1.8 m

Table Mounting Heights

The sensor must be installed at the correct height depending on the relative gas density (d). Normal rule is:

d < 0.95: Mount on the ceiling

0.95 < d < 1.05: Mount at a height of 1.5 –1.8 m above floor

d > 1.05: Mount at a height of 0.3 m above floor

Exception NO2: Mounting height for NO2sensors: 0.5 to 1.8 m above floor!

•Choose mounting location of the sensor according to the local regulations.

•Consider ventilation conditions! Do not mount the sensor near the airflow (air passages, suction

holes etc.).

•Mount the sensor at a location with minimum vibration and minimum variation in temperature

(avoid direct sunlight).

•Avoid locations where water, oil etc. may influence proper operation and where mechanical damage

might be possible.

•Provide adequate space around the sensor for maintenance and calibration work.

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 5

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

3Electrical Connection

3.1 Plug Connection (SC2) in SB2, MSB2, MSC2, WSB2

SC2 sensors are equipped with a reverse polarity protected connector (3-pin). It must not be plugged in

the wrong position by force (already clamped at the factory).

All black plugs are connected in parallel, so it is irrelevant which plug to use.

3.2 Terminal Connection (MC2)

•Open cover.

•Insert field bus cable from above, cut and strip it.

•Connect it to the terminal (only 3-wire connection possible).

•For the 4–20 mA operating mode, please remove the built-in

500 Ωresistor between terminals 2 and 3.

4Commissioning

Only trained technicians should perform the following when commissioning:

•Check for correct mounting location.

•Check if connection is correct.

•Check power voltage (for MC2).

•Install the Sensor Cartridge(s) if not already installed ex works.

•Check Sensor Cartridge connector for correct engagement.

•Calibrate (if not already factory-calibrated).

Within the first weeks after commissioning, there may be a deviation in the sensor behaviour.

Required instruments for commissioning (calibration):

•Service Tool DGC-06 STL or

•PCE06 Software incl. USB/RS-485 communication set:

•Calibration:

▪Test gas bottle with synthetic air (20 % O2, 80 % N)

▪Test gas bottle with test gas in the range of 30–90 % of the measuring range. Rest is synthetic

air.

▪Extraction set consisting of gas pressure regulator and flow meter

▪Calibration adapter with tube, type C2Z4.

4.1 Installation of Sensor Cartridge

The Sensor Cartridge is supplied in a separate package and should be installed on the housing only during

commissioning to protect it against dirt and damage.

•Check gas type, range and calibration date of Sensor Cartridge.

•Define installation place on the housing of the basic or remote sensor and break out knockouts.

•Tighten the Sensor Cartridge with M32 hexagon lock nut.

•Plug in the Sensor Cartridge at X2 or X3 of the PCB. Observe plug polarity, the plug must engage.

4.2 Registration of the Sensor Cartridge

Registration and addressing of the field bus address can be read in the User Manual for sensor boards, e.g.

GA_SB2 etc.

0 VDC

Sensor Unit

MC2-X-XXXX

123

+24 V

4-20mA

/ 2-10V

ooo

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 6

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

5Calibration

The service tool STL06 or PCE06 Software are available for convenient on-site calibration. See description of

Service Tool STL06 or PCE06 Software.

There is also the possibility to exchange the SC against a calibrated SC on site. The used SC can then be

calibrated directly in the office or at the MSR_E Calibration Service and then reused again.

Prior to calibration the Sensor Cartridge must be supplied with power voltage without

interruption for warm-up and stabilisation. The run-in time depends on the sensor element and is

shown in the following table:

Gas type

Formula

Calibration with

replacement gas

(ratio calibration

gas : gas)

Run-in

time for

calibra-

tion (h)

Warm-

up time

(s)

Flow

rate

(ml/

min)

Calibra-tion

interval in

months1

Ammonia

NH3

300

150

Chlorine

Cl2

NO21:1 CL2

500

Hydrogen chloride

HCL

H2S 20:31 HCl

500

Hydrogen cyanide

HCN

H2S 15:25 HCN

500

Ethylene oxide

ETO

150

Ethylene

C2H4

150

Formaldehyde

CH2O

CO 7:1 CH2O

150

Carbon monoxide

150

Ozone

NO22:1 O3

500

Sulphur dioxide

SO2

150

Hydrogen sulphide

H2S

500

Nitrogen dioxide

NO2

500

Oxygen

150

6 / 12

1Manufacturer-recommended calibration interval for normal environmental conditions

Table Calibration

Please observe proper handling procedures for compressed gas and test gas bottles (regulations

TRGS 220)!

Test gas can be toxic, so never inhale it!

Symptoms: Dizziness, headache and nausea.

Procedure if exposed: Remove victim to fresh air at once, seek medical attention.

5.1 Calibration Work

Prior to calibration you have to activate the mode “Special Mode” at the basic device, only then the

calibration menu is enabled. During the special mode the basic device doesn’t issue alerts.

•Connect calibration adapter carefully to the sensor cartridge.

•Connect calibration tool you want to use to the PCB.

•Select the Sensor Cartridge to be calibrated by selecting the gas type.

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 7

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

Zero calibration

•Apply synthetic air (flow rate according to the table "calibration", 1 bar ± 10%) to the Sensor

Cartridge.

•The current zero offset and the offset value of the first calibration is read by displaying.

•When the value is stable, confirm and the new zero offset factor is calculated.

The new offset factor is checked for plausibility and stored in the buffer memory. The current

measured value is output with the new offset factor and the offset display is updated.

•With "Save" the new offset factor is written in the SC memory, only then the Zero calibration has

been successfully completed. If you exit the menu without pressing "Save", the original offset data

for the measured value calculation will continue to be used.

With a zero reading > 10 % of measuring range during the zero calibration, zero calibration is not possible.

Gain calibration

•Enter test gas concentration (value between 30 and 90 % of the measuring range)

•The current sensor element sensitivity is read by displaying.

•Apply test gas (flow rate according to the table "Calibration", 1 bar ± 10%) to the Sensor Cartridge.

•When the value is stable, confirm and the new gain factor is calculated.

The new gain factor is checked for plausibility and stored in the buffer memory. The current

measured value is output with the new gain factor and the sensor element sensibility is updated.

•With "Save" the new gain factor is written in the SC memory, only then the gain calibration has been

successfully completed. If you exit the menu without pressing "Save", the original gain data for the

measured value calculation will continue to be used.

By limiting the gain factor, calibration will not be possible any more when the sensitivity of the sensor

reaches a residual sensitivity of 40 %. Then the Sensor Cartridge has to be replaced

For more information, see the user manual of the corresponding tool.

5.2 Exchange of Sensor Cartridge

Instead of the on-site calibration, the used SC can be replaced simply and conveniently by a calibrated one.

The communication of the local bus (Sensor Cartridge <> PCB) is continuously monitored during

operation and results in an immediate error message on the gas controller in case of fault or

interruption. When replacing the sensor unit, the communication of the local bus is interrupted

when unplugging the SC connector which leads to an immediate triggering of the error

message.

•Disconnect the SC connector from the PCB or the remote PCB (error message will be activated).

•Loosen the locknut.

•Remove used SC.

•Take calibrated SC out of the original packaging, check for gas type, measuring range and valid

calibration date.

•Insert the SC and retighten with lock nut.

•Insert the SC plug into the socket at the PCB or remote PCB. Check plug for proper engagement.

The local bus communication is automatically established and tested. At the same time the gas type and the

measuring range of the "new" SC are compared with the data stored in the PCB. If they match and the

communication is correct, the error message will be automatically acknowledged in the Gas Controller.

The yellow LED of the PCB flashes with a pulse of 1 sec. as long as the SC connector is disconnected

(communication error). After the local bus communication has been re-established and the conformity test

has been successful, the LED goes into flashing mode with 3 sec. pulse duration until the sensor’s warm-up

time is over.

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 8

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

Apply a defined gas concentration on the sensor element with the help of the gas generator and check the

measurement signal at the analog output or at the relay outputs.

With this test, the complete function chain “Sensor Element > Sensor Cartridge> Local Bus> PCB> Field Bus>

GC Controller” is tested.

6Inspection and Service

Inspection, service and calibration of the sensor should be done by trained technicians at regular intervals.

We therefore recommend concluding a service contract with MSR or one of their authorized partners.

According to EN 45544-4, inspection and service have to be executed at regular intervals. The maximum

intervals have to be determined and respected by the person responsible for the gas warning system

according to the legal requirements. MSR-E recommends employing the common inspection and service

intervals as specified in the general regulations of the gas measuring technique. We recommend an

inspection interval of 3 months. The recommended calibration intervals depend on the sensor element and

can be read from the table “Calibration”. If there are different intervals, always observe the shortest one.

Inspections and services must be documented. The date for the next maintenance has to be affixed to the

sensor.

6.1 Inspection

Gas sensors should be controlled regularly by a competent person according to EN 45544-4. The following

has to be checked in particular:

•Maintenance/ calibration interval not exceeded.

•Visual inspection of the sensor including cable for damage etc.

•Remove dust deposits, especially at the gas inlet.

•The filter at the gas inlet has to be replaced if extremely dirty.

6.2 Service and Calibration

When performing the maintenance, you have to do the calibration and the functional test, see chapter 5, in

addition to the inspection.

A fixed calibration interval is stored for each sensor type.

SC2 Sensor heads:

If this interval is exceeded, a digital maintenance message is generated and forwarded.

Performing the calibration automatically deletes this message.

MC2 Sensor heads:

If this interval is exceeded, the current output of the MC2 goes to a fixed 19 mA signal. For new devices

(factory calibration), the interval may be exceeded by a factor of 1.5.

After voltage recovery, there is a defined interruption of this message. This can be of use in order to employ

the device without the maintenance message for a few days (adjustable in system parameters -> error time,

value range> 1) until the calibration is repeated.

Performing the calibration automatically deletes this message.

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 9

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

7Troubleshooting

7.1 Indicators at the SC2

The SC2 has got no diagnostic indications; they are only available on the PCB of SB2, MSC2, MSB2 or WSB2.

7.2 Indicators at the MC2

The 4–20 mA output of the MC2 can be used as diagnostic indicators.

Output current

Restart: 1 mA

Device error: 2 mA

Tolerable negative sensor drift: 3–4 mA

Normal measurement mode: 4–20 mA

Tolerable overrange: 20–21 mA

Overrange error: > 21 mA

Maintenance message: 19 mA

7.3 Sensor Board (PCB)

Trouble

Cause

Solution

Green LED isn’t on.

Power voltage not applied.

Measure tension at X4:

(16–28 V DC) Pin 1 (+) and 2 (-)

Polarity not correct at X4.

Connect correctly.

Connector X4 not plugged in.

Check the plug.

Wire breakage

Check the wiring.

Green LED doesn’t flash.

PCB: no address

Check PCB address, address

correctly.

PCB: no field bus communication

Check field bus wiring,

topology and termination.

No measured value at the Tool

or Controller

SC not or wrongly plugged in.

Check SC plug.

SC not registered.

SC gas type/measuring range doesn’t

match with registered ones.

Check SC data<> registration

data for conformity.

Message at the Tool / Controller:

- 24 V DC voltage <range>

- 5 V DC voltage <range>

- Temp. <range>

- WatchDog triggered

Internal error

Replace PCB.

7.4 Sensor Cartridge (Messages at the Tool / Controller)

Measuring signal <range>

Internal error

Replace SC.

5 V DC voltage < range >

Temp. < range >

WatchDog triggered

SC Input 1 stored type

Wrong SC type at input 1

Check SC at input 1, replace it.

SC Input 2 stored type

Wrong SC type at input 2

Check SC at input 2, replace it.

SC Input 3 stored type

Wrong SC type at input 3

Check SC at input 3, replace it.

User Manual - PolyGard®2 / µGard®2

Sensors for Toxic Gases

Page 10

PolyGard/ µGard® are registered trademarks of MSR Made in Germany GA_SC2_MC2_Tox_D_0820

Phone +49 8531 9004-0 Fax: +49 8531 9004-54 Specification subject to change without notice

MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking www.msr-electronic.de

8Cross-sensitivity Data

The cross sensitivity depends on the used transmitter type and can be read from the table Technical Data

(see section 9.3). Other gases can have an influence on the sensitivity, too. The table does not claim to be

complete. The indicated sensitivity data are only standard values referring to new sensor elements.

9Technical Data

All specifications were collected under optimal test conditions.

We confirm compliance with the minimum requirements of the applicable standard.

9.1 MC2

ELECTRICAL

Power supply

16–29 V DC, reverse-polarity protect.;

18–27 V AC (only for output signal 2–10 V)

Power consumption

23 mA, max. (0.6 VA for 24 V)

Analog output signal

Proportional, overload and short-circuit proof,

load 500 Ω for current signal, ≥ 50 kΩ for voltage signal

4–20 mA or 2–10 V = measuring range

3.2–4 mA or 1.6–2 V = underrange

> 20–21.2 mA or 10–10.6 V = overrange

2 mA or 1 V = fault

> 21.8 mA or 10.9 V = fault High

SENSOR ELEMENT

Gas type

See Ordering Information

Sensor element

Electrochemical sensor

Pressure range

Atmospheric ± 10 %

Storage temperature range1

0 °C to 20 °C (32°F to 68 °F) or

5 °C to 20 °C (41°F to 68 °F) for NH3, CO, NO2, O2

Storage time

6 months

Poisoning

Electrochemical sensors are susceptible to poisoning by

organic solvents and silicone vapours.

PHYSICAL

Enclosure P (M25)

Polycarbonate UL 94 V2

Colour

RAL 7032 (light grey)

Dimensions

(D x H) 24 x 22 mm (0.94 x 0.87 in.)

Weight

Ca. 30 g (0.066 lb)

Protection class

IP65 (only if mounted in housing type A, D or N)

Mounting

Screw mounting / M25

Wire connection

Screw-type terminal min. 0.25 mm2, max. 1.3 mm2,3-pin,

24 to 16 AWG

REGULATIONS

Directives

EMC directives 2014/30/EU,

Compliance with:

EN 378

EN 45544

EN 50104 (for O2)

EN 50271

EN 50545

EN 61010-1:2010

ANSI/UL 61010-1

CAN/CSA-C22.2 No. 61010-1

Warranty

1 year on sensor (not if poisoned or overloaded),

2 years on device

1A higher storage temperature can have a negative effect on sensitivity and service life.

2 We recommend recalibrating the devices if stocked for a longer period (>8 weeks)

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