Cole parmer 8721 User Manual

OPERATION MANUAL

THERMO-HYGROMETER

Model:8903/8904/8906

Model:

8711
8721

o

o

ON

C / F

HOLD

OFF

RESET

MN / MX

PRG

MX / td

MODEL: 8721

o

C / F

RESET

o

OFF

ON

HOLD

MN / MX

MODEL: 8711

FUNCTION KEYS

1) ON key - Power on

2) OFF Key - Power off

3) PRG Key (8721 only)

- Switch to alarm check mode from
measuring mode

- Switch to alarm setting mode from
alarm check mode

- Save the alarm settings and
calibrations

- Switch to temperature and humidity
calibration

oo

4) C/ F Key

- Switch between display of C and F

1

oo

5) RESET Key

- Reset Min/Max memory

- Erase alarm settings

- Skip calibration mode

- Switch back to normal measuring
mode from alarm check mode or
calibration mode

6) HOLD Key

- Hold display

7) MN/MX Key

- Display minimum value of memory

- Display maximum value of memory

- Increase/Decrease the temperature
deviation value

- Sleep/Non-Sleep mode switch

8) NX/td Key (8721 only)

- To flash next digit for alarm setting

- To display the next alarm setting
value

- To flash next digit for calibration

- Dew Point read out

9) 9V DC power jack

10) Probe socket

11) RS232 output socket

QUICK REFERENCE

A. MEASURING MODE

This is the basic function to measure
temperature ( C or F) and relative
humidity.

B. CALIBRATION MODE

With our HR33 & HR75 humidity
reference, the end users can do the
calibration themselves. This feature
provides a DO-IT-YOURSELF
accuracy maintenance and
replacement of the probe.

oo

2

C. LOW/HIGH HUMIDITY CALIBRATION MODE

Two points' calibration is necessary for
maintaining the accuracy of the meter.

D. ALARM CHECK MODE

An environment monitoring system
is implanted in the meter for special
uses. A monitoring range can be set
up earlier,the user will be warned for
any out-of-range reading.This Mode
provides you to check the alarm
settings to see if they are under your
requirement.

E. ALARM SETTING MODE

Set, adjust and cancel the alarm
settings.

F. RS232 OUTPUT
To link to the computer gets records.
G. SLEEP MODE OPTION
We have a Non-sleep mode and a 20

minutes sleep mode. You can switch
easily between two.

H. MN/MX MODE
Maximum and Minimum monitoring.

You can find out the minimum and
maximum values of previous recording
simply by pressing MN/MX key
sequentially. The screen will display
Fig. 1 & Fig. 2. Press it again to go
back to normal mode or the meter will
return to normal mode in 10 seconds.

RS232

FIG 1

3

MIN

%RH

o

F

RS232

FIG 2

%RH

o

F

MAX

I. HOLD MODE
Hold the screen for specific measuring.

Simply press HOLD key when you do
the measurement. The screen will
display Fig. 3. Press it again to go back
to normal mode.

RS232

FIG 3

HOLD

%RH

o

OPERATION MODES

The 8721/8711 provides 6 operation
modes, 3 output port, sleep mode switch

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and C/ F switch.

A. MEASURING MODE

This is the normal operation mode for
measuring relative humidity and
temperature in the default unit.
When the power is first on, the full LCD
display will appear as Fig. 4.

Full display will appear for 1 second, then
readings for humidity and temperature,
(Big characters is humidity and small
characters is temperature) will display.
Fig. 5

4

F

FIG 4

td

MAX

HOLD

BAT
MIN

RS232

%RH

RS232

LOTEMP

HITEMP

LO%RH

HI%RH

o

o

F

C

FIG 5

%RH

o

F

B. LOW HUMIDITY CALIBRATION MODE
(The calibration solution is optional,
not included in standard package.)

Two points' calibration is necessary for
the accuracy of the meter.

1. Power off. Push ON & PRG at the
same time and hold till the LCD displays
CAL (Fig. 6). As ON & PRG are
released, the C ( or F, depended on

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which is the default unit) will display at the right
bottom corner (Fig. 7).

FIG 6

FIG 7

o

C

5