RS PRO RS 51 206-3722 User manual

2
INTRODUCTION
1-1 Unpacking and Inspection
Upon removin
g
y
our new Di
g
ital Thermometer from its packin
g
,
y
ou should have the followin
g
items:
1. Di
g
ital Thermometer.
2. K-t
y
pe Bead Thermocouple.
3. Operator's Manual.
4. Protective Holster.
5. Belt Clip.
1-2 Front Panel
Refer to Fi
g
ure 1 and the followin
g
numbered steps to familiarise
y
ourself with the meter's front panel controls and
connectors.
1. Digital Display — The di
g
ital displa
y
has a 3-1/2 di
g
it LCD readout (maximum readin
g
1999) auto polarit
y
decimal point, "

" , function symbol and unit annunciators.
2. Thermocouple Connectors — Allows connections of miniature thermocouple plugs (2 for model 52).
DIGITAL THERMOMETER
OPERATOR'S MANUAL
RS 51 206-3722
RS 52 206-3738

3
3. Hold Switch — Used to hold the numeric readin
g
. When pressed the HOLD annunciator is displa
y
ed.
Conversions are made but the readin
g
is not updated.
This switch is limited to use on a sin
g
le temperature scale at a time.
4. Power ON/OFF Switch — Turns the thermometer on or off.
5. Resolution Selector — Selects either 0.1 or 1 de
g
ree resolution.
6. :
:
/ ;
;
Selector — Used to select the °C and °F units.
7. Max. Switch — Press once to display the max. reading in measurements, press again to cancel.
Disable this function before changing control keys to keep reading correctly.
This switch is limited to use on a single temperature scale at a time.
8. T1-T2 Switch - Selects the T1-T2 mode for measuring (52 only).
9. T2 Switch - Selects the T2 mode for measuring (52 only).
10. T1 Switch - Selects the T1 mode for measuring (52 only).

5
SPECIFICATIONS
2-1 General Specifications
This Thermometer conforms to the temperature / volta
g
e tables of the National Bureau of Standards and to the IEC
Standards for K-t
y
pe.
Display: 3 1/2 di
g
it Liquid Cr
y
stal Displa
y
(LCD) with a maximum readin
g
of 1999.
Polarity Indication: Automatic, positive implied, ne
g
ative indicated.
Overrange Indication: "OL" or "-OL".
Low Battery Indication: "

" is displa
y
ed when the batter
y
volta
g
e drops below operatin
g
volta
g
e.
Sampling Rate: 2.5 time / sec.

6
2-2 Environmental Conditions
Operating Temperature: 0°C to 50°C, 0 to 75% R.H.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H with batter
y
removed from meter.
Temperature Coefficient: 0.15 x (Specified accurac
y
) / °C, < 18°C or > 28°C.
Power Requirements: 9V alkaline batter
y
.
Battery Life: Alkaline 250 hours.
Dimensions (H x W x D): 160mm x 64mm x 26mm without holster.
170mm x 74mm x 39mm with holster.
Weight (including battery): 300
g
ms without holster.
430
g
ms with holster.
Accessories: 2 K-t
y
pe bead thermocouples (52), 1 K-t
y
pe bead thermocouple (51) batter
y
(installed), operator's
manual and protective holster.

7
2-3 Electrical Specifications
(1) Accurac
y
is ± (% readin
g
+ number of di
g
its) at 23°C ± 5°C less than 75% R.H for thermometer.
MODEL: 51
Measurement Range Resolution Accuracy Input Protection
-50°C ~ 199.9°C0.1°C ± (0.2% readin
g
+ 1°C)
-58°F ~ 199.9°F 0.1°F± (0.2% readin
g
+ 2°F)
-50°C ~ 200°C1°C ± (0.3% readin
g
+ 2°C)
-58°F ~ 392°F 1°F± (0.3% readin
g
+ 4°F)
200°C ~ 1000°C1°C ± (0.4% readin
g
+ 2°C)
392°F ~ 1832°F 1°F± (0.4% readin
g
+ 4°F)
1000°C ~ 1300°C1°C ± (0.6% readin
g
+ 2°C)
1832°F ~ 1999°F 1°F± (0.6% readin
g
+ 4°F)
60V d.c. or 24 Vr.m.s.

8
MODEL: 52
Input protection: 9V DC or 6V rms.
Measurement Range Resolution Accuracy (T1 or T2)
-50°C ~ 199.9°C0.1°C ± (0.2% readin
g
+ 1°C)
-58°F ~ 199.9°F 0.1°F± (0.2% readin
g
+ 2°F)
-50°C ~ 200°C1°C ± (0.3% readin
g
+ 2°C)
-58°F ~ 392°F 1°F± (0.3% readin
g
+ 4°F)
200°C ~ 1000°C1°C ± (0.4% readin
g
+ 2°C)
392°F ~ 1832°F 1°F± (0.4% readin
g
+ 4°F)
1000°C ~ 1300°C1°C ± (0.6% readin
g
+ 2°C)
1832°F ~ 1999°F 1°F± (0.6% readin
g
+ 4°F)
Accuracy (T1 — T2)
± (0.5% readin
g
+ 1°C)
± (0.5% readin
g
+ 4°F)
± (0.5% readin
g
+ 2°C)
± (0.5% readin
g
+ 4°F)
± (0.5% readin
g
+ 2°C)
± (0.5% readin
g
+ 4°F)
± (0.6% readin
g
+ 2°C)
± (0.6% readin
g
+ 4°F)

9
(2) Thermocouple Characteristics: K-t
y
pe thermocouple.
50BK bead thermocouple:
1. Temperature Ran
g
e : -40°C to 204°C (-40°F to 399.2°F).
2. Tolerances : ± (2.2°C or 0.75%) from 0°C to 204°C.
± (2.2°C or 2.0%) from 0°C to -40°C.
3. Wire Len
g
th : 1m, with miniature plu
g
.
Teflon tape insulated.
OPERATION
This instrument is desi
g
ned to use external K-t
y
pe thermocouple as temperature sensor. Temperature indication
follows National Bureau of Standards and IEC 584 temperature / volta
g
e tables for K-t
y
pe thermocouple are
supplied with thermometer.

10
#WARNING
TO AVOID ELECTRICAL SHOCK, DO NOT USE THIS INSTRUMENT WHEN VOLTAGES AT THE MEASURE-
MENT SURFACE EXCEED 24V RMS OR AC OR 60V DC. (6Vrms AC OR 9VDC FOR 52) TO AVOID DAMAGE
OR BURNS, DO NOT MAKE TEMPERATURE MEASUREMENTS IN MICROWAVE OVENS.
3-1 Preparation and Caution before Measurement
1. Before measurement, warm up for at least 30 seconds, after connectin
g
the thermocouple to the thermometer.
2. If the instrument is used near noise
g
eneratin
g
equipment, be aware that the displa
y
ma
y
become unstable
or indicate lar
g
e errors.
3-2 Temperature Measurements
1. Connect the plu
g
of the thermocouple to the connector of the thermometer.
2. Select the desired input mode, resolution and °C/°F.
3. Use the sensin
g
point of the thermocouple to measure the surface to be measured.
4. Read the stable readin
g
.
5. #"Warnin
g
: Do not measure the surface if the potential exceeds 60 Vd.c. or 24Vr.m.s."

11
MAINTENANCE
To keep the instrument clean, wipe the case with a damp cloth and deter
g
ent, do not use abrasives or solvents.
An
y
adjustment, maintenance and repair shall be made b
y
a skilled person.
To maintain the thermocouple in
g
ood condition, observe the followin
g
precautions:
— Avoid excess bendin
g
.
— Do not overheat the thermocouple.
— Avoid chemical reactions that can dama
g
e the thermocouple.
BATTERY REPLACEMENT
The meter is powered b
y
a sin
g
le 9V batter
y
. Refer to Fi
g
ure 2 and use the followin
g
procedure to replace the
batter
y
:
1. Turn the meter off. Remove the thermocouple connector.
2. Remove the holster.
3. Position the meter face down. Remove the screw from the batter
y
cover.
4. Remove the batter
y
cover.
5. Lift the batter
y
from case top, and carefull
y
disconnect the batter
y
from batter
y
connector leads.
6. Install a new batter
y
.
7. Replace the batter
y
cover. Reinstall the screw and replace the holster.