Ametek JOFRA CTC-140 A User manual

User manual
Temperature Calibrator
JOFRA CTC-140/320/650 A/B
JOFRA CTC-1200 A

User manual
Temperature Calibrator
JOFRA CTC-140/320/650 A/B
JOFRA CTC-1200 A
Copyright 2005 AMETEK DENMARK A/S (123199-UK)

2013-10-10
4
5
6
7
8
9
11
12
10
3
2
1
+-
Switch Test
RS232
FIG. 1
C
A
L
I
B
R
A
T
I
O
N
I
N
S
T
R
U
M
E
N
T
S

2013-10-10
AUTO
STEP
SWITCH
TEST
ESC
MENU
min
C
F
F
C
°
°
°
°
CALIBRATION INSTRUMENTS
FIG. 2

2013-10-10
°C
°C

2013-10-10

2013-10-10

2013-10-10

123199 04 1
List of contents
1.0 Introduction..................................................................... 2
1.1 List of equipment received................................................. 2
2.0 Safety instructions ......................................................... 3
3.0 Operating the calibrator ................................................. 8
3.1 Before use......................................................................... 8
3.2 Keyboard......................................................................... 11
3.3 Display ............................................................................ 11
3.4 Connections .................................................................... 12
3.5 Calibrator functions - overview......................................... 12
3.6 Selecting the set-temperature.......................................... 12
3.7 SWITCH TEST ................................................................ 13
3.8 AUTO STEP.................................................................... 14
3.9 MENU.............................................................................. 15
4.0 Setting the main voltage and replacing the fuses .... 16
5.0 After use........................................................................ 18
5.1 Switching off the calibrator............................................... 19

2 123199 04
1.0 Introduction
CTC-calibrators are temperature calibrators designed to calibrate
temperature sensors and temperature switches.
Read this manual carefully before using the instrument and make
sure that all safety instructions and warnings are observed.
1.1 List of equipment received
When you receive the instrument, the following should be enclosed:
1 calibrator
1 mains cable
1 set of test cables (1 black, 1 red)
1 insertion tube
1 tool for insertion tube
1 traceable certificate
1 reference manual
1 User manual
1 RS232 serial cable
1 CD-ROM containing software package “JOFRACAL”

123199 04 3
2.0 Safety instructions
Read this manual carefully before using the
instrument!
In order to avoid any personal injuries and/or damage to
the instrument all safety instructions and warnings must be
observed.
Disposal – WEEE Directive
These calibrators contain Electrical and Electronic
circuits and must be recycled or disposed of properly (in
accordance with the WEEE Directive 2002/96/EC).
Warning
About the use:
The calibrator must not be used for any purposes other
than those described in this manual, as it might cause a
hazard.
The calibrator has been designed for indoor use only
and is not to be used in wet locations.
The calibrator is not to be used in hazardous areas,
where vapour or gas leaks, etc. may constitute a
danger of explosion.
The calibrator is not designed for operation in altitudes
above 2000 meters.
The calibrator is a CLASS I product and must be
connected to a mains outlet with a protective earth
connection. Ensure the ground connection of the
calibrator is properly connected to the protective earth
before switching on the calibrator. Always use a mains
power cable with a mains plug that connects to the
protective earth.

4 123199 04
To ensure the connection to protective earth any
extension cord used must also have a protective earth
conductor.
Only use a mains power cord with a current rating as
specified by the calibrator and which is approved for the
voltage and plug configuration in your area.
Before switching on the calibrator make sure that it is
set to the voltage of the mains electricity supply.
Always position the calibrator to enable easy and quick
disconnection of the power source (mains inlet socket).
The calibrator must be kept clear within an area of 20
cm on all sides and 1 metre above the calibrator due to
fire hazard.
Never use heat transfer fluids such as silicone, oil,
paste, etc. in the dry-block calibrators. These fluids may
penetrate the calibrator and cause electrical hazard,
damage or create poisonous fumes.
The calibrator must be switched off before any attempt
to service the instrument is made. There are no user
serviceable parts inside the calibrator.
When cleaning the well or insertion tube, REMEMBER
to wear goggles when using compressed air!
About the front panel:
The connections used to test thermostats must NEVER
be connected to a voltage source.
Thermostats must not be connected to any other
voltage source during a test.
About the insertion tubes, insulation plug, well
and sensor:
Never leave hot insertion tubes which have been
removed from the calibrator unsupervised – they may
constitute a fire hazard or personal injury.
If you intend to store the calibrator in the optional
aluminium carrying case after use, you must ensure
that the instrument has cooled down to a temperature
below 100°C/212°F before placing it in the carrying
case.

123199 04 5
Never place a hot insertion tube in the optional carrying
case.
Use only insulation plugs supplied by AMETEK
Denmark A/S. Do not try to modify the insulation plugs
to make them fit the sensor (CTC-1200 A only).
About the fuses:
The fuse box must not be removed from the power
control switch until the mains cable has been
disconnected.
The two main fuses must have the specified current and
voltage rating and be of the specified type. The
use of makeshift fuses and the short-circuiting of
fuse holders are prohibited and may cause a hazard.
Caution – Hot surface
This symbol is engraved in the grid plate.
Do not touch the grid plate, the well or the insertion
tube when the calibrator is heating up – they may be
very hot and cause burns.
Do not touch the tip of the sensor when it is removed
from the insertion tube/well – it may be very hot and
cause burns.
Do not touch the handle of the calibrator during use – it
may be very hot and cause burns.
Over 50°C/122°F
If the calibrator has been heated up to temperatures
above 50°C/122°F, you must wait until the instrument
reaches a temperature below 50°C/122°F before you
switch it off.
Do not remove the insert from the calibrator before the
insert has cooled down to less than 50°C/122°F.

6 123199 04
Caution – Cold surface
Below 0°C/32°F (applies only to the CTC-140 A
models)
Do not touch the well or insertion tube when these are
below 0°C/32°F - they might create frostbite.
If the calibrator has reached a temperature below
0°C/32°F, ice crystals may form on the insertion tube
and the well. This, in turn, may cause the material
surfaces to oxidize
To prevent this from happening, simply heat up the
calibrator to 100°C/212°F until all water left has
evaporated.
Remove the insulation plug while heating up.
It is very important that humidity in the well and insertion
tube is removed to prevent corrosion and frost
expansion damages.
Caution…
About the use:
Do not use the instrument if the fan is out of order.
Before cleaning the calibrator, you must switch it off,
allow it to cool down and remove all cables.
About the well, insertion tube and grid plate:
The well and the insertion tube must be clean before
use.
Do not pour any form of liquids into the well. It might
damage the well or cause a hazard.
Scratches and other damage to the insertion tubes
should be avoided by storing the insertion tubes
carefully when not in use.
The insertion tube must never be forced into the well.
The well could be damaged as a result, and the
insertion tube may get stuck.
The insertion tube must always be removed from the
calibrator after use.

123199 04 7
The humidity in the air may cause corrosion oxidation
on the insertion tube inside the instrument. There is a
risk that the insertion tube may get stuck if this is
allowed to happen.
If the calibrator is to be transported, the insertion tube
must be removed from the well to avoid damage to the
instrument. If the insertion tube is not removed from the
CTC-1200 A the ceramic well might crack.
Note…
The product liability only applies if the instrument is
subject to a manufacturing defect. This liability becomes
void if the user fails to follow the instructions set out in this
manual or uses unauthorised spare parts.

8 123199 04
3.0 Operating the calibrator
3.1 Before use
Warning
The calibrator must not be used for any purposes other
than those described in this manual, as it might cause a
hazard.
The calibrator has been designed for indoor use only
and is not to be used in wet locations.
The calibrator is not to be used in hazardous areas,
where vapour or gas leaks, etc. may constitute a
danger of explosion.
The calibrator is not designed for operation in altitudes
above 2000 meters.
The calibrator is a CLASS I product and must be
connected to a mains outlet with a protective earth
connection. Ensure the ground connection of the
calibrator is properly connected to the protective earth
before switching on the calibrator. Always use a mains
power cable with a mains plug that connects to the
protective earth.
To ensure the connection to protective earth any
extension cord used must also have a protective earth
conductor.
Only use a mains power cord with a current rating as
specified by the calibrator and which is approved for the
voltage and plug configuration in your area.
Before switching on the calibrator make sure that it is
set to the voltage of the mains electricity supply.
Always position the calibrator to enable easy and quick
disconnection of the power source (mains inlet socket).
The connections used to test thermostats (fig. 1 pos. 10
and 11) must NEVER be connected to a voltage
source.

123199 04 9
Thermostats must not be connected to any other
voltage source during a test.
Never use heat transfer fluids such as silicone, oil,
paste, etc. in the dry-block calibrators. These fluids may
penetrate the calibrator and cause electrical hazard,
damage or create poisonous fumes.
The calibrator must be kept clear within an area of 20
cm on all sides and 1 metre above the calibrator due to
fire hazard.
Use only insulation plugs supplied by AMETEK
Denmark A/S. Do not try to modify the insulation plugs
to make them fit the sensor (CTC-1200 A only).
Caution – Hot surface
This symbol is engraved in the grid plate.
Do not touch the grid plate, the well or the insertion
tube as the calibrator is heating up – they may be very
hot and cause burns.
Do not touch the handle of the calibrator during use – it
may be very hot and cause burns.
Follow the instructions below before using the calibrator (cf. fig. 1):
1. Place the calibrator on an even horizontal surface away from
all draughts.
Caution…
Do not use the instrument if the fan is out of order. Ensure
a free supply of air to the fan located at the bottom of the
instrument (pos. 9).
2. Check that the voltage shown on the power control switch
(pos. 7) is identical to the mains voltage.
3. Plug in the cable below the power control switch (pos. 8) and
check that the earth connection is present.
4. Select an insertion tube (pos. 4) with a well diameter that
matches the sensor (pos. 1) to be calibrated. Insert the
insertion tube in the well of the calibrator

10 123199 04
Caution…
The well and the insertion tube must be clean before
use.
The insertion tube must never be forced into the well.
The well could be damaged as a result, and the
insertion tube may get stuck.
Do not pour any form of liquids into the well. It might
damage the well or cause a hazard.
5. If the design of the sensor permits it, use an insulation tube
(pos. 2) and insulation (pos. 3) for the best results. These
should be mounted as shown in fig. 1.
6. Place the sensor (pos. 1) in the insertion tube (pos. 4) as
shown in fig. 1.
7. In order to protect the sensor and its connections it is
recommended to use a heat protection shield (104216) at
high temperatures.

123199 04 11
3.2 Keyboard
The keys on the keyboard activate the following functions (cf. fig. 2):
POS Description
UP ARROW button used to adjust temperature values
(value increases) and to select menu options.
DOWN ARROW button used to adjust temperature values
(value decreases) and to select menu options.
ENTER button used to accept chosen options.
ESC/MENU button used to escape or to activate the menu
system (hold button down for min. 2 seconds).
AUTO STEP button used to activate AUTO STEP.
The function is used to switch between a series of set-
temperatures automatically.
SWITCH TEST button used to activate SWITCH TEST.
The function automatically detects the opening/closing
temperatures for thermostats.
3.3 Display
The various segments of the display are used to indicate the following
(cf. fig. 2):
POS Description
Used to display Read-temperature and parameters in the
menu system.
Celsius temperature unit for top display.
Fahrenheit temperature unit for top display.
Celsius temperature unit for bottom display.
Fahrenheit temperature unit for bottom display.
Minute time unit for bottom display.