ThermoWorks P770 User Manual

Operation Manual

SERIE

Precision Measuring Instruments
P700, P705, P710, P715, P750,
P755, P770, P755-LOG, P770-LOG

DOSTMANN electronic

P700

®

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Retractable stand

Mounting device for
probe handle

Measuring port 1

Measuring port 2
(P705, P715, P755,
P770, P755-LOG,
P770-LOG)

USB PC interface
port

Big
LC-Display

Keyboard

Unit diagram

2

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Operation Manual

Summary

1. Handling

1.1. General advices

1.2. Setting to work

1.3. Switch on/off

1.4. Menu

1.4.1. Measuring unit switching (UNIT)

1.4.2. Probe selection (Prob)

1.4.3. Difference temperature (Lin2)

1.4.4. Calibration (CAL)

1.4.4.1. Calibration
combination probe
(temperature/humidity)

1.4.5. Channel activation (Chnl)

1.4.6. Enter Area for volume flow (ArEA)

1.4.7. Memory setup (Lo6)

1.5. Recalling memory data
(HOLD/MAX/MIN/AVG)

1.6. Measuring rate (FAST-modus)

1.7. AUTO-OFF-function

1.8. Special-functions

1.8.1 Ohm/microvolt/volt/hertz display

1.8.2 Zero adjustment

1.8.3 Deactivation of the 2nd channel (toggle)

2. Power supply / Changing the battery

3. Error codes / troubleshooting

4. Technical data

5. Interface protocol

6. Connector layout

7. Data of probe-calibration

8. Guarantee

3

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1.1 General advice

• For cleaning the instrument please do not use
abrasive cleaner but a dry or wet piece of cloth.

• Please store the measuring instrument in a dry and
clean place.

• Avoid any force like shocks or pressure to the
instrument.

• Do not use force to connect the probe or interface
plugs in. The interface plug is different from the
probe plug.

• If no sensor is connected to the instrument while
switching on „open“ shows on the display (Please
refer to chapter error codes/troubleshooting).

• A retractable stand on the back of the instrument
allows it to be used as a bench top instrument.

1.2 Operation

Before switching on the instrument, connect the
probe/s to the instrument and insert the battery
(Please refer to chapter 6. Power supply / battery
changing). A number on the instrument's housing
marks each port.

1.3 Switching on and off

By operating the ON/OFF-key the instrument swit­ched on or off. After switching on the instrument
indicates a full segment test for 1,5 sec., afterwards
the instrument shows the calibration-code and the
adjusted measurement category for channel 1. (Only
2-channel instruments: After additionally 1,5 sec.
the instrument shows the calibration-code and the
adjusted measurement category for channel 2.)
Then it starts operating in measurement mode in­dicating the actual measurement value (for example:
temperature). All instruments display the measure­ment value of channel 1 on the top display line (big
display line). Directly below you will see the trending
bargraph. The second channel of our 2-channel
instruments you will see on the bottom line (small
display line).

Fig 1:

Example of channel information after switching on.:

channel 1

Line 1: [oFF P = calibration code of channel 1
according to standard linearization (DIN), probe selec­tion of channel 1 = Pt100.

channel 2

Line 2: [oFF P = calibration code of channel 2
according to standard linearization (DIN), probe selec­tion of channel 2 = Pt100.

1. Handling

4

1

2

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Note: On all instruments you can select the mea­surement category (chapter 1.4.2. Prob) according
to the model version. Instruments that are delivered
only with one probe the correct measurement cate­gory is preset. In other case please check chapter

1.4.2. (Prob) for the correct set-up.

1.4 Menu

The adjustments of the instruments like the mea­surement value, calibration of Up and down keys
probes, deactivation of channels and so on are
resulting from the structure of the menu. You will
reach into the main menu by pushing
[ENTER/MENUE]. With the up and down keys [



]
you can choose your required menu item. Push
[ESC] to be back in the measuring mode.

Menu structure

1.4.1 Measuring unit switching °C and °F

respective %rH, td or g/m

3

/ [Unit]

Unit = Measuring unit

Measuring unit temperature

(°C=Celsius, °F=Fahrenheit)

Measuring unit humidity

(%rH=relative humidity, td=dew point, g/m

3

=abso-

lute humidity)

Important!

5

Unit

°C

°F

m/s

%rh

g/m

3

°C td

°F td

Pa

hPa

Prob Lin2 CAL Chnl ArEA Lo6

P

J

K

L

N

R

S

T

RH

D

Pr

H

T1-T2 oFF

oP1

oP2

OFF c OFF

ON m ON

m

3

/s

❶ up and down keys
❷ key [ESC]
❸ key

[ENTER/MENUE]

❶

❷

❸

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To change the measuring unit push [ENTER/MENUE].
Use the up and down keys [] to select Unit.
Push again [ENTER/MENUE]. On the left corner of
the display appears a small 1, which indicates the
selected channel. For changing the channel use the
up and down keys [



] Push [ENTER/MENUE] to

confirm. On the right corner of the display appears

°C or °F, or %rH, td or gm

3

(depending on the selec-

ted probe). Use the up and down keys [



] again to
adjust the requested measuring unit and push
[ENTER/MENUE] to confirm. Push [ESC] to be back
in the measuring mode.

1.4.2 Probe selection / [Prob]

Push [ENTER/MENUE] to change a probe. Use the
up and down keys [



] to select Prob. Push

[ENTER/MENUE] to confirm.

On the left corner of the display appears a small 1,
which indicates the selected channel. For changing
the channel use the up and down keys [



]. Push
again [ENTER/MENUE] to confirm. On the right cor­ner of the display appears the active probe. Use the
up and down keys [



] to change the probe. Push
[ENTER/MENUE] to confirm the requested probe.
Push [ESC] to be back in the measuring mode.

Measurement Probe selection LC-Display Suitable for

(Prob) these types

of measuring

instruments:

Temperature Pt100 (RTD) P700/P705/

P750/P755/P770

P755-LOG/P770-LOG

Temperature Fe-CuNi Typ J for all P700-

instruments

Temperature NiCr-Ni Typ K for all P700-

instruments

Temperature Fe-CuNi Typ L for all P700-

instruments

Temperature NiCrSi-NiSi Typ N for all P700-

instruments

Temperature Pt13Rh-Pt Typ R P700/P705/

P750/P755/P770

P755-LOG/P770-LOG

Temperature Pt10Rh-Pt Typ S P700/P705/

P750/P755/P770

P755-LOG/P770-LOG

Unit





MENUE

Prob Lin2 CAL PrEn Chnl ArEA Lo6

Unit





MENUE

Prob Lin2 CAL PrEn Chnl ArEA Lo6

6

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Measurement Probe selection LC-Display Suitable for

(Prob) these types

of measuring

instruments:

Temperature Cu-CuNi Typ T for all P700-

instruments

Humidity %rF P750/P755/P770

P755-LOG/P770-LOG

Flow m/s P750/P755/P770

P755-LOG/P770-LOG

Pressure Pa P750/P755/P770

P755-LOG/P770-LOG

Thermal flow m/s P750/P755/P770
probe P755-LOG/P770-LOG

Note: Please check the probe selection to be sure
that the correct probe is entered. If a measurement
value is changed with the ENTER-key at the menu
Prob, the standard calibration will be automatically
used.

Indications for the combination probes
(temperature and humidity):

Please adjust relatively humidity as measurement
value for the channel on which the combination
probe is plugged. If you want that the measured
temperature of the plugged combination probe is
shown as well, you have to deactivate the channel
on which no probe is plugged on (see chapter

1.4.6./Chnl).

1.4.3 Difference temperature
(only 2-channel instruments) / [Lin2]

To display the difference temperature push
[ENTER/MENUE]. Use the up and down keys [



]
to select Lin2. Push again [ENTER/MENUE]. On the
right corner of the display appears a T

1-T2

. Use the

up and down keys [



] to adjust the requested sel­ection. Push [ENTER/MENUE] to confirm. Push
[ESC] to be back in the measuring mode.

Note: Both channel have to be activated for showing
the difference temperature.

1.4.4 Calibration function / [CAL]

Despite high quality manufacturing techniques, each
probe is slightly different from specified standards.
To eliminate inaccuracies caused by exchanging or
ageing of probes, the instrument offer easy calibra­tion functions which guarantee that the system
accuracy is always as good as if the instrument was
specifically calibrated to the individual probes in our
laboratory.

Important!

Important!

Important!

7

Unit





MENUE

Prob Lin2 CAL PrEn Chnl ArEA Lo6

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The instruments offer three calibration options:

1) [OFF]:Standard characteristic curve (e.g. Pt100­resistance according DIN IEC 60751)

2) [OP1]:Calibration by code (2 x four digit code) is
equivalent to a 2-point calibration
The code is marked clearly by a label on each stan­dard probe.

3) [OP2]:Calibration by physical standard references
(1-point, 2-point or 3-point calibration)

CAL = calibration

Push [ENTER/MENUE] to calibrate the instrument
with sensor. Use the up and down keys [



] to
select CAL. Push again [ENTER/MENUE]. On the
left corner of the display appears a small 1, which
indicates the selected channel. For changing the
channel use the up and down keys [



]. Push

[ENTER/MENUE] to confirm.

Use the up and down keys [



] to select the re­quested calibration option. Push [ENTER/MENUE] to
confirm.

Standard linearization
according DIN IEC 60751 / [oFF

Use the up and down keys [



] to select [oFF.
Push [ENTER/MENUE] to confirm.
Push [ESC] to be back in the measuring mode.

Calibration by code / oP1

Use the up and down keys [



] to select oP1. Push
[ENTER/MENUE] to confirm.
On the bottom of the display appears a very small 1,
after this number a four-digit number (Hex-Code/0..F)
is displayed. For changing the number use the up
key [



]. For stepping to the next number use the

down key [



]. If the requested number is complete
then push [ENTER/MENUE] to confirm. Now on the
bottom of the display appears a very small 2, after
this number a second four-digit number is displayed.
For changing the number please follow the manual
as before. Push [ESC] to be back in the measuring
mode.

Note: After confirming oP1 by pushing [ENTER/
MENUE] the function oP1 (calibration by code) is
activated, even though you leave the menu by press­ing [ESC].





CAL

oFF oP1 oP2

Important!

8

Unit





MENUE

Prob Lin2 CAL PrEn Chnl ArEA Lo6

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Display-indication with active calibration code(OP1):
The CAL -segment and the small 1 on the left indica-

tes to the user that oP1 is activated.

Calibration by physical standard references / oP2

Use the up and down keys [



] to select oP2. Push
[ENTER/MENUE] to confirm.
On the bottom of the display appears 1 P. For chang­ing between a 1-Point [1 P], 2-Point [2 P] or 3-Point
[3 P] - calibration use the up and down keys [



].

Example of a 1-Point calibration:

Push [ENTER/MENUE] to confirm. On the display
appears Go. After the displayed measuring value is
stabile push [ENTER/MENUE]. App. 2 seconds later
in the first display line appears P1 (measuring value

1); in the second display line appears dP. (standing
for decimal point).

Use the up and down keys [



] to select the num­ber of digits after decimal point:

dP. = two decimal digits
dP . = one decimal digit

(decimal point is jumping one digit to the right)

Push [ENTER/MENUE] to confirm. On the second
line of the display appears Si -. Use the up and down
keys [



] to select the requested sign.

Si = reference standard shows

a negative measuring value (below 0,00C°)

Si = reference standard shows

a positive measuring value (above 0,00C°)

Push [ENTER/MENUE] to confirm. On the second
line of the display appears Fd 0.
Use the up and down keys [



] to select the re­quested range:

Fd 0 = below 100,00°C
Fd 1 = above 100,00°C

Push [ENTER/MENUE] to confirm. On the display
appears 00.00. For changing the value use the up
key [



] . For stepping to the next number use the

down key [



]. If the requested value is complete
then push [ENTER/MENUE] to confirm.
Push [ESC] to be back in the measuring mode.

Note: A break of the physical calibration cannot
be done by the [ESC]-button. Switching off the in­strument can only do a break of the physical cali­bration.





oP2

1 P 2 P 3 P

Important!

9

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