Bartington MS2 User manual

Operation Manual for
MS2 Magnetic Susceptibility System

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Table of Contents
List of figures 6
1. About this Manual 7
1.1. Symbols Glossary 7
2. Safe Use 7
3. Introduction 8
4. General Information 9
4.1. Measuring Magnetic Susceptibility 9
4.2. The Sensors 9
4.3. Operating Environment Considerations 10
4.4. Software 11
4.5. SI and CGS units 12
4.6. Range Selection 12
4.7. Calibration 12
5. MS2 Meter 13
5.1. Front Panel Controls 13
5.2 MS2 Meter Rear Panel 14
5.3. Rear Panel 14
5.4. Connecting a Sensor 14
5.5. Taking Measurements 15
5.6. Serial Interface 16
5.7. Internal Batteries 17
5.8. Data Transmission 20
5.9. Power Supply Accessories 21
6. MS2B Dual Frequency Sensor 22
6.1. General Description 22
6.2. Dual Frequency Measurements 23
6.3. Single Frequency Measurements 23

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6.4. Setting up the Sensor 23
6.5. Preparation of Samples 25
6.6. Sample Holder Effects 25
6.7. Mass and Volume Specific Measurements 26
6.8. Taking Measurements 26
6.9. Calibration Notes 27
7. MS2C Core Scanning Sensor 28
7.1. General Description 28
7.2. Operating Instructions 29
8. MS2E High Resolution Surface Scanning Sensor 30
8.1. General Description 30
8.2. Characteristics 30
8.3. Operating Instructions 33
8.4. Care of Sensor 34
9. MS2 Probe Handle for Use with Probes Type MS2D and MS2F 35
9.1. General Description 35
10. MS2D Probe 36
10.1. General Description 36
10.2. Calibration Notes 37
11. MS2F Probe 37
11.1 General Description 37
11.2. Operating Instructions 38
12. MS2G Single Frequency Sensor 39
12.1. General Description 39
12.2. Setting Up 40
12.3. Sample Height Adjustment 40
12.4. Calibration 40
12.5. Taking Measurements 41

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13. MS2H Down-Hole Probe 42
13.1. General Description 42
13.2. MS2H Equipment List 43
13.3. Operating Procedure 43
13.4. Checking Calibration 46
13.5. Scaling Factors 47
14. MS2K High Stability Surface Scanning Sensor 47
14.1. General Description 48
14.2. Characteristics 48
14.3. Operating Instructions 49
15. MS2/MS3 Susceptibility/Temperature System 51
15.1 MS2/MS3 Susceptibility Temperature System Cables 51
16. MS2W Water Jacketed Sensor 52
16.1. Calibration Note 53
17. MS2WF Furnace Sensor 53
17.1. Operation 54
17.2. Construction 55
17.3. Pt/Pt.Rh type ‘S’ thermocouple 55
18. Maintenance of MS2WF Furnace 56
18.1. Preparation of Plugs 56
18.2. Furnace Outer Insulation 56
18.3. Thermocouple Installation 57
19. MS2WFP Power Supply/Temperature Controller 58
19.1. Internal Power Distribution 59
19.2. Temperature Control 59
19.3. RS-232 Buffer 59
19.4. Data Format 60
20. Operating Instructions for Susceptibility/Temperature System 60
20.1. Setting Up the Equipment 61

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20.2. Connection to a Computer (GeoLab for Windows Software) 65
20.3. Sensor Orientation 66
20.4 Sample Insertion 67
20.5. High Temperature Measurements 67
20.6. Thermal Gradients 69
20.7. Low Temperature Measurements 70
20.8. GeoLab 70
21. Troubleshooting 71
21.1. No Push-Button Operation 71
21.2. Large Variations in Measured Values 71
21.3. Serial Communications Problems 71
22. Storage and Transport 72
23. Disposal 73
23.1. Waste Electrical and Electronic Equipment (WEEE) Regulations 73
Appendix 1. Magnetic Susceptibility of Common Rocks 74
Appendix 2. Calibration Graphs for MS2C Sensor 75
Appendix 3. Anisotropy of Magnetic Susceptibility Measurements (AMS) 77
A3.1. Installation of the AMS Adapter 77
Appendix 4. Adjusting MS2B the platen height. 79
Appendix 5. Calculating Magnetic Susceptibility 80
Notes 81

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
Figure 1a. MS2 meter, front panel. 16
Figure 1b. MS2 meter, rear panel 17
Figure 2. Replacing the MS2 battery. 20
Figure 3. Screws in the base of the MS2 meter. 21
Figure 4. Double-sided insulation foam. 22
Figure 5. MS2B dual frequency sensor. 24
Figure 6. MS2C core scanning sensor. 30
Figure 7. MS2E high resolution surface scanning sensor. 32
Figure 8. MS2E response characteristics. 33
Figure 9. MS2E calibration sample: correct orientation 34
Figure 10. Using a non-magnetic ruler with MS2E sensor. 36
Figure 11. MS2 probe handle for use with probes type MS2D and MS2F. 37
Figure 12. MS2D probe. 38
Figure 13. MS2F probe. 39
Figure 14. Relative variation in sensitivity around the MS2F probe 40
Figure 15. MS2G single frequency sensor. 41
Figure 16. MS2H down-hole probe. 44
Figure 17. MS2K high stability surface scanning sensor. 49
Figure 18. MS2K Depth Response. 51
Figure 19. MS2W water jacketed sensor. 54
Figure 20. MS2WF furnace sensor. 55
Figure 21. MS2WFP power supply/temperature controller. 60
Figure 22. Susceptibility/temperature system. 62
Figure 23. X/T Equipment 63
Figure 24. MS2WFP Connections. 63
Figure 25. MS2WFP outline drawing and mains voltage selection. 64
Figure 26. MS2WFP Mains Voltage Selector Switch. 65
Figure 27. Water Supply Connections. 65
Figure 28. Water cooling system for susceptibility/temperature system. 66
Figure 29. Setting MS3 to Mode B in Bartsoft. 67
Figure 30. Mounting the MS2W on the MS2WF. 68
Figure 31. Using Tweezers to insert crucible into MS2W. 69
Figure 32. Plug inserted above crucible. 69
Figure 33. Thermocouple Selection Switch. 70
Figure 34. MS2WFP Control Panel. 70
Figure 35. Connection for T type Thermocouple. 72
Figure A1.1 Magnetic susceptibility of common rocks. 76
Figure A2.1. Relative response to varying core diameter within MS2C sensor. 77
Figure A2.2. Thin section response of MS2C sensor. 78
Figure A3.1. Changing the MS2B platen. 79-83

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
This manual describes the operation of the MS2 range of magnetic susceptibility measurement
instruments.
It should be read in conjunction with the magnetic susceptibility product brochure DS0020 and
operation manual OM1131 (Multisus for Windows), both of which are available on the MS2/MS3
product page on the Bartington Instruments at www.bartington.com/ms3.html.
Outline drawings of the MS2 meter and sensors are also available on the product page.
Following the instructions in this manual will enable the optimum operation for which your
equipment is designed. Failure to follow these instructions may invalidate your warranty.

The following symbols used within this manual call your attention to specific types of
information:
WARNING: Indicates a situation in which serious bodily injury or death could result if the
warning is ignored.
Caution: Indicates a situation in which bodily injury or damage to your instrument, or both,
could result if the caution is ignored.
Identifies items that must be disposed of safely to prevent unnecessary damage to the
environment.
Note: Provides useful supporting information on how to make better use of your purchase.
2. Safe Use
WARNING: While the MS2 meter usually runs off internal batteries, it can also be powered
by mains electricity. Ensure that the unit is properly earthed at all times. When using
the mains power supply, ensure that the mains adaptor is correct for the local AC mains
voltage (110V or 240V). Do not open the casing or have contact with any internal parts.
WARNING: In addition to the above, ensure that the mains selector on the MS2WFP sensor
is set to the local AC mains voltage (110V or 240V).
WARNING: These products are not qualified for use in explosive atmospheres or life
support systems. Consult Bartington Instruments for advice.

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The MS2 Magnetic Susceptibility System comprises a variety of sensors together with a field
portable measuring instrument, either the MS2 meter or the MS3 meter.
The MS3 meter is a more compact instrument than the MS2 meter, of higher range and lower
noise, with a primarily USB interface for use in conjunction with a Windows computer or PDA. It
can be used with all of the MS2 sensors in place of the MS2 meter. As it is the subject of its own
operation manual (OM3227), available from the product page, it will not be discussed further
here.
The range of equipment described in this manual in addition to the MS2 Meter is as follows:
• MS2B dual frequency sensor
• MS2C core scanning sensor
• MS2E high resolution surface scanning sensor
• MS2 handle for use with probes type MS2D and MS2F
• MS2D probe
• MS2F probe
• MS2G single frequency sensor
• MS2H down-hole probe
• MS2K high stability surface scanning sensor
• MS2W water jacketed sensor
• MS2WF furnace sensor
• MS2WFP power supply/temperature controller
All sensors are described in the product brochure.
Each MS2 sensor is designed for a specific application and sample type, and is connected to
the MS2 meter via a simple TNC-TNC coaxial cable that is supplied with the order. The meter
displays the magnetic susceptibility value of materials when these are brought within the
influence of the sensor.
An RS-232 serial interface allows the instrument to operate in conjunction with custom software,
Multisus or Bartsoft, running on a portable data logger or PC. Interfacing commands are
provided should there be requirement for an alternate interface.
The MS2 meter is powered by internal rechargeable batteries.

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The circuitry within the MS2 meter powers the sensors and processes the measurement
information produced by them. The measurements are obtained digitally using a time dependent
method. This results in precise and repeatable measurements. The sensors are independently
calibrated and are therefore fully interchangeable between MS2 meters.


Magnetic susceptibility corresponds to the ability of a material to be magnetised in an external
field. Bulk (volume) susceptibility χvol can be directly related to the relative permeability (μr ) of a
material: χvol = μr - 1 and where μr is the ratio of permeability of material/permeability of vacuum.
The MS2/3 instruments rely on the change of inductance in an inductor when the permeability of
its core is changed.
The reference state is measured when the sensor contains only air (the permeability of air is
approximated as the permeability of a vacuum). Taking a reading with a sample will then give the
permeability of the material.
Any thermally induced sensor drift needs to be eliminated by occasionally obtaining a new ‘air’
value, to re-establish the zero reference. This is done by pressing the ‘Z’ button on the MS2
meter (see Front Panel Controls).
The magnetic susceptibility value is displayed digitally and output via a serial interface.
For further information on calculating the magnetic susceptibility and how it is related to
magnetic permeability, see Appendix 5. Calculating Magnetic Susceptibility.

Each sensor subjects the sample to a non-saturating field that has the advantage of measuring
initial susceptibility without destroying any sample magnetic remanence. When measuring non-
metallic samples, the sensors are particularly insensitive to sample conductivity.

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The sensors can be broadly divided into laboratory and field survey sensors:
Type Sensor Purpose
Laboratory
sensors
MS2B Measurement of magnetic susceptibility of soil, rock and
sediment samples.
MS2C High resolution volume susceptibility measurements on
whole cores.
MS2E Measurements with high spatial resolution along split cores
or suitably prepared geological specimens.
MS2G Measurements of powder or liquid samples.
MS2W Measuring temperature dependency of magnetic
susceptibility.
Field
survey
equipment
MS2D Assessment of the concentration of ferromagnetic materials
in the top 100mm of the land surface.
MS2F Stratigraphic study of exposed geological and
archaeological sections.
MS2H Down-hole sensor for sub-surface measurements of
volume magnetic susceptibility of strata.
MS2K Highly repeatable measurements of the volume magnetic
susceptibility of moderately smooth surfaces.
The full range, specifications and functions of the sensors available for use with the MS2 meter
are given in the product brochure.

The following environmental factors should be taken into account when using the MS2 system.
4.4.1. Temperature Induced Drift
The MS2 sensors operate on the principle of comparison between the magnetic permeability
of air and the relative permeablility obtained with the contribution of the sample magnetic
permeability. In order to do this the sensors are required to measure the magnetic permeability
to a high resolution. This can be a very demanding requirement as any change in temperature
can lead to a slight distortion of the coil shape, causing an apparent change in permeability, and
therefore in susceptibility.
Each sensor employs its own technique for temperature compensation to minimise any
temperature induced drift. A facility for automatic correction of temperature drift at the end of a
measurement sequence is also provided by the Multisus and Bartsoft software packages. This
drift correction is worked out by taking a zero (or blank) reading at the start, and then taking a
second blank reading (not a zero) after the sample measurement.

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The best precaution is to ensure that the operating temperature is constant during
measurements, and preferably cool, and that sensor and samples have time to reach an
equilibrium temperature. This may be more difficult when operating in the field.
4.4.2. Wet Conditions
Caution: These instruments are protected against the ingress of moisture but operation in
very wet conditions should be avoided.
Note: Some sensors can be operated while submerged in water: see product brochure for
further information.
4.4.3. Noise and Interference Check
Caution: These instruments should not be operated close to high power radio transmitters,
heavy electrical machinery, computers, or other electrical or magnetic equipment.
Note: The unit is unlikely to be affected by interference from other equipment in the
normal operating environment. However, by their nature the sensors are susceptible
to electromagnetic interference and operation close to a radio frequency source with a
frequency close to the operating frequency of the sensor should be avoided. It is important
to position the sensor to minimise interference and obtain the best performance.
Select the normal sensitivity, x1.0 range. With no sample present, first press the ‘Z’ button and
then select continuous measurements on the ‘M’ toggle switch. If fluctuations of greater than ±1
least significant digit per reading appear on the display then external electrical noise should be
suspected. In this case the only solution is to re-site the equipment.
Before using the laboratory sensors, first check the selected area for freedom from large ferrous
objects by moving the sensor and watching for any changes on the display.
4.4.4. Electromagnetic Compatibility
The MS2 meter and sensors contain no high frequency electronics likely to cause emissions
that could affect other apparatus. Emissions are minimised by the use of a rechargeable
battery charged from a mains adaptor and decoupling of the internal switched mode power
supply. The sensors generate a small magnetic field so very sensitive equipment such as SQUID
magnetometers will be affected if placed in close proximity.

The available software is described in the product brochure and is supplied with individual
operation manuals. Bartsoft is the most up to date software package and can be used to operate
both the MS2 and MS3 meters. Multisoft is an older software package that is only compatible
with the MS2 meter. The Geolabsoft software is intended for use only with the MS2 X/T
Temperature Susceptibility System.

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
The instrument may be pre-set to display the susceptibility value directly in either SI or CGS
units. The table below shows the basic mass or volume specific unit thus produced.
Mass and volume in SI and CGS units
Mass (cmass ) Volume (cvol)
SI 10-8 (m3/kg) 10-5
CGS 10-6 (cm3/g) 10-6
Numerical conversion from SI to CGS units is accomplished by dividing the SI value by 4π, i.e. cCGS
= cSI/4π. The MS2 meter performs this function internally but by using the constant 0.4π to keep
the numbers in a similar range of magnitude.

The instrument may be pre-set to display the susceptibility value in either the 1.0 or 0.1 range.
The table below shows the the exponent value of the least significant digit (i.e. the last digit on
the LCD) for each range. The units in the table below for volume susceptibility.
Exponent values for least significant digit in 1.0 and 0.1 ranges
SI CGS
1.0 10-5 10-6
0.1 10-6 10-7
On the 0.1 range a decimal point will be displayed, effectively moving all the digits on the LCD to
the left when compared with the 1.0 range. It should also be noted that one measurement in the
0.1 range will be an average of multiple readings taken over a period of 10 seconds.

All sensors are calibrated either directly or indirectly to the diamagnetism of water (H2O), where
density r(rho) = 1.
cmass (mass susceptibility of H2O) is -0.72 x 10-6 CGS
Therefore, for H2O, cvol = rx cmass
= 1 x -0.72 x 10-6 CGS.
Precise mass specific measurements are only possible using the MS2B sensor where the
sample volume is accurately defined.

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
Figure 1a. MS2 meter, front panel.
Key to Figure 1a
1. ‘Measure’ (‘M’) push button
2. Toggle switch
3. ‘Zero’ (‘Z’) push button
4. On/Off Switch
5. Range multiplier switch
6. Socket for coaxial cable connection to sensor

There are five front panel controls.
1. ‘Measure’ push button, labelled ‘M’: permits sample readings to be taken.
2. Toggle switch: performs the same function as the push button but permits continuous
measurements.
3. ‘Zero’ push button, labelled ‘Z’: permits ‘air’ readings to be taken. By performing
a measurement to ‘air’ this control re-sets the instrument and brings subsequent
measurements within the range of the display.
4. On/Off Switch: controls the internal battery supply and also permits the selection of either SI
or CGS units.
5. Range multiplier switch: allows selection of either x1 or x0.1 sensitivity range. In the second
case the result is shown to the first place of decimal and a 10-fold increase in measurement
time provides additional noise filtering. The switch also activates the battery indicator.
531 24
6

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Figure 1b. MS2 meter, rear panel.
Key to Figure 1b
1. Power supply connector
2. RS-232 serial interface
3. Three-way rotary switch
4. Charging light

The rear panel contains the following features:
1. Power supply connector: the power adaptor plug should be inserted here. For more
information see Internal Batteries.
2. RS-232 serial interface: an MS2 RS-232 cable can be inserted here and connected to a
computer to allow control and communication using Bartsoft or Multisus software. For more
information see Serial Interface.
3. Three-way rotary Switch: allows the user to select one of three RS-232 communication
settings options. For more information see Serial Interface.
4. Charging light: this LED will light up when power is connected and the MS2 battery is being
charged. For more information see Internal Batteries.

Connect the sensor to be used to the front panel socket of the MS2 meter with the supplied 50Ω
TNC-TNC cable, and switch on by selecting either SI or CGS units.
31 2
4

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Set the meter to the 1.0 range for the initial measurement of any sample, to establish the
approximate result, before switching to the more sensitive 0.1 range. If the value of a sample is
greater than 1000 then the most significant digit will not be seen if measured on the 0.1 range,
leading to an apparent gross error in the result.
Irrespective of the type of sensor being used, measurements are accomplished using the
following procedure.
1. Take an ‘air’ reading by pressing the ‘Z’ push button with the sample to be measured away
from the influence of the sensor. The display will appear blank and a colon will appear to
show the instrument is ‘busy’. The completion of a Z cycle will be announced by a bleep and
the display will show all zeros.
2. Place the sample within the influence of the sensor and press the ‘M’ button. The ‘busy’ colon
will appear and the display will show the previous reading until updated at the completion of
the current measurement period. This is announced with a beep. At this time serial data will
be transmitted.
3. If either push button is enabled at the completion of a cycle then a repeat measurement will
be taken.
4. To measure weakly magnetic material, select the more sensitive x0.1 range and compensate
for any thermally induced drift by making a series of measurements:
a) Zero to air by pressing ‘Z’ button = R0 ( = 0)
b) Measure samples = R1 , R2 ....
c) Measure ‘air’ = RFinal
The mean of an ‘air’ measurement before and after the sample is subtracted from the nth
sample measurement Rn:
Corrected value Rk= Rn- n x (RFinal- R0)/N
where N is the total number of measurements after the initial zero (including RFinal)
In the case that only one sample measurement is taken: Rk= R1- (RFinal- 0)/2
When taking manual measurements, attempt to keep the time between measurements as
consistent as possible. If recording values by hand then the previous value can be read whilst
the current measurement is taking place, thus saving time and improving precision.
The drift correction can be done automatically using Multisus or Bartsoft where the time of
each measurement is recorded, and the is drift applied linearly as a function of time.

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The magnetic susceptibility of common rocks is shown in Appendix 1.

An RS-232 compatible serial interface, which permits data logging in the field and data
processing in the laboratory, is included within this unit. The instrument produces a serial output
of each meter reading, whether triggered by a signal on the serial interface or by a manual push
button operation. A zeroing operation produces no serial output.
Via the four-way connector on the rear panel of the instrument, the RS-232 serial interface
allows data communication between the MS2 meter and a computer with custom designed
software. For reasons of economy of battery drain, the interface is restricted to operate over a
maximum cable length of 50 metres.
An RS-232 connecting cable is provided with the MS2 for connection to a computer via a 9-way
D-type connector. No hardware handshaking is provided.
The 'Z' and 'M' functions can be controlled externally by sending the ASCII character Z (Zero)
or M (Measure) to the MS2 from the computer. To zero the instrument once, therefore, it is
necessary to send Z followed by carriage return. Sending M followed by carriage return will
cause a single measurement to be made. To return the instrument to the IDLE mode, any other
character can be sent.
Data is only transmitted from the MS2 following the instruction to measure. The delay between
the instruction being received and the data being transmitted will be equal to the measuring
period, which depends on the sensor type (see relevant specification in the product brochure)
and the range selected. The time taken to reset the meter to zero is the same as that required
to take a measurement. Software should allow sufficient time for a response before issuing the
next command.
The RS-232 interface operates in one of three modes as set by the screwdriver-operated rotary
switch on the rear panel. The options are:
A. Standard operation 1200 baud with a 7 bit word (for use with Multisus software).
B. X/T system operation 1200 baud with an 8 bit word (for use with GeoLab software).
C. Operation at 9600 baud with an 8 bit word.
See Data Transmission for further information.

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The instrument is powered by internal maintenance-free rechargeable Ni-MH batteries.
Recharging can be carried out from either a mains electricity supply or a vehicle power socket.
WARNING: When using the mains power supply, ensure that you are using a mains adaptor
that is correct for local AC mains voltage (110V or 240V).
To recharge the batteries, connect either the 12V mains power supply adaptor or the vehicle
power socket cable to the 2.1mm connector on the rear panel of the instrument where a yellow
LED will indicate that charging is taking place. The rate of charge will depend on whether the
instrument is switched ON (trickle charge) or OFF (full charge).The charger input is polarity
protected and any DC source as specified in the product brochure can be used.
Note: To maintain the full capacity of the batteries it is necessary to completely discharge
and recharge them not more than every six months.
5.6.1. Battery Charging: Laboratory Use
When the instrument is switched on and connected to the mains supply via the battery charger,
the batteries receive a trickle charge and therefore continuous use from the power supply is
permitted.
5.6.2. Battery Charging: Field Use
Note: For field use, the batteries will need to be charged overnight for use the following
day. A full recharge will take 16 hours with the instrument switched off and connected to an
external mains supply or vehicle power socket.
Caution: To prevent overcharging, do not continue charging for more than 16 hours.
5.6.3. Battery Check
The condition of the batteries can be checked by selecting ‘BATT’ on the range multiplier switch.
The battery indicator lamp will appear:
• Green: charge acceptable.
• Yellow: re-charge soon.
• Red: re-charge immediately.
Note: Use of the instrument when the battery voltage is low will cause excessive
measurement drift and serial communication may fail.

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Page 18 of 82 OM0408/49
5.6.4. Replacing the MS2 Meter Battery
Figure 2. Replacing the MS2 battery.
Key to Figure 2.
1. NiMH battery pack
2. Two-way connector
3. Earth lead to earth point in the upper enclosure
For MS2 meters purchased prior to 1st January 2006, scrape away the wax coating over the four
slotted nuts in the base of the unit and undo the nuts with a 6mm wide split screwdriver.
Figure 3. Screws in the base of the MS2 meter.
1 2
3

BARTINGTON INSTRUMENTS
Page 19 of 82 OM0408/49
For units purchased after 1st January 2006, the holes are no longer filled with wax. A small
Philips screwdriver must be used to release the enclosure halves. The top half of the enclosure
can now be carefully lifted away from the unit.
Caution: Before opening the enclosure, ensure that the instrument is turned off and not
connected to the mains power.
Caution: Take care not to disconnect the earth lead between the two halves of the
enclosure.
Note: It is recommended to disconnect and lift PC7 off (4 screws), and lift rear panel out
while assembling the new battery pack.
Disconnect and remove the battery. On later batteries the connection is via a two-way connector.
On older units the connection is via a terminal block with screw terminals. The terminal block
forms part of the battery assembly, and must be removed with the battery to avoid the possibility
of shorting the battery and creating a potential fire risk. Once the battery has been disconnected,
remove the terminal block: this will be used on the replacement battery.
Figure 4. Double-sided insulation foam.
Key to Figure 4
1. Double sided foam
Note: The double-sided adhesive foam that holds the battery in place should be replaced
when the battery is replaced. The old foam can be removed using isopropanol cleaning
solvent.
WARNING: On no account use acetone as this will dissolve the enclosure.
Once dry, apply new strips of double sided foam (supplied with the replacement battery).
Insert the replacement battery and reconnect.
1

BARTINGTON INSTRUMENTS
Page 20 of 82 OM0408/49
For older units, it will be necessary to remove the two-way plug from the replacement battery,
cutting each wire separately so as not to short the battery. Assemble the terminal block onto the
battery wires, then reconnect being careful to connect black to black and red to red.
Re-assemble top half of enclosure and secure with the appropriate screws or slotted nuts.
Dispose of the old battery in an approved disposal facility.

Two-way transmission of data may be accomplished over a screened cable up to 50 metres.
A 2-metre cable with a 9-way ‘D’ type connector is provided.
The baud rate and bit format are set by a rotary switch on the rear panel as follows:
A. Standard serial interface
Baud rate 1200
Bits per character 1 start, 7 data, 2 stop, no parity
Number of characters 5 + carriage return
Character format Sign, four digits, CR
Control lines Inactive
Code ASCII
B. Serial interface for κ/T system operation
(Used for compatibility with the temperature meter)
Baud rate 1200
Bits per character 1 start, 8 data, 2 stop, no parity
Number of characters 5 + carriage return
Character format Sign, four digits, CR
Control lines Inactive
Code ASCII
C. Serial interface for 9600 baud option
Baud rate 9600
Bits per character 1 start, 8 data, 2 stop, no parity
Number of characters 5 + carriage return
Character format Sign, four digits, CR
Control lines Inactive
Code ASCII