Owner manual
Instruction Manual
52233 DIGITAL PSYCHROMETER
FEATURES:
• Rotating cap to protect sensor
• External Temp. probe (optional)
• LCD digital display
• Data Hold to capture readings
• Pocket size
• Low battery indicator
• Fast response, Accurate reading
• Max/Min record function
• Microprocessor circuitry for reliability
• Auto Power Off with disabling capability
CONTROLS AND INDICATORS
LCD DISPLAY
RH%
Dry Bulb
Dew Point
Wet Bulb
xternal
emperature
KEYS:
1) - Power on/off
2) ˚C/˚F - Switch between ˚C and ˚F display
3) MODE - Switch between Db (air temp.)
& DP display
4) HOLD - Hold display
+ HOLD - Disable
Auto-off
5) RESET
• Reset Min/Max memory
• Wb and Ex (Ex for external
probe only) mode switch
6) MN/MX Key
HOLD
MX/MN
o o
C/ F
MODE
RESET
• Display minimum or maximum memory value
from power on.
IMPORTANT:
External Probe
OPEN
CLOSE
Open the sensor
protection cap before
starting measurement in
order to achieve accurate
values.
AUTO POWER OFF
Unit will turn itself off after 5 minutes. To override Auto
Power Off function, press + HOLD while the meter is
off. When “n” appears (See Fig. A), release the HOLD key.
Auto-off is now disabled.
Fig. A
MODE OPTIONS
1) Turn the protective sensor cap in a counter
clockwise direction.
2) Turn meter on (See Fig. B)
(3) Press the ˚C/˚F key more than 1 sec. to convert
reading to desired unit.
Fig. B
Fig. D
Fig. B Fig D.
DATA HOLD FUNCTION
Press the HOLD key until (HLD) appears in display. The
current reading is now held and will not change until
Hold function is cancelled. (See Fig.D) Press the HOLD
key again to cancel Hold function. Hold function can be
used on humidity, dew-point, dry bulb, ext. temp., wet
bulb.
DEW POINT/DRY BULB FUNCTION
Press the MODE key until “DP” appears on display. (See
Fig. E) Press MODE key again to display dry bulb “Db.”
Fig. E
WET BULB FUNCTION
Turn the meter on. User will see “Wb” temperature
indicated on the display.
Ex. TEMPERATURE FUNCTION (OPTIONAL)
Plug the external probe (part # 52231) into the meter.
Short press RESET key until “Ex” appears on display.
Unit will now display external probe temperature.
See Fig. F2
Fig. F2
Fig. G
Fig. F2 Fig. G
MIN./MAX. FUNCTION
1) Press and hold MN/MX until (MIN) appears on display.
(See Fig. G) Display now shows minimum humidity
and temperature readings in memory.
2) Press and hold MN/MX key again until (MAX) appears
on display. Display now shows maximum humidity
and temperature readings in memory.
3) To return to current temperature and humidity
readings press and hold MN/MX until Min or Max
disappear from the display.
4) Press the RESET key more than two seconds to clear
current readings from memory.
WARNING: While checking MIN/MAX value for EX do not
replace the probe otherwise an error code will display.
If you don’t plug the probe into socket before turning
the meter on, the error code will also appear when you
check the MIN/MAX value.
LOW-BATTERY
A battery symbol will appear in the top right corner
of the display when the power is low. Failure to replace
batteries will have an effect on the accuracy of the
readings.
1. Open the battery cover.
2. Remove the expired batteries.
3. Insert 2 AAA batteries making sure the batteries are
positioned with the correct polarity. Replace cover.
TROUBLESHOOTING
POWER ON BUT NO DISPLAY
A) Press ON/OFF key for more than 0.1 sec.
B) Check the batteries for correct polarity and secure
contact.
C) Replace with new batteries and try again.
D) Remove the batteries for one minute and put back in
for second try.
NO DISPLAY
A) If the low battery indicator displayed before the
display disappeared, replace the batteries.
B) Check whether auto-off mode is active. If yes, press
+ HOLD or ON/OFF + HOLD key to disable auto-
off function.
Er 1: Circuit error in RH measurement channel, return
for repair.
Er 2: Circuit error in Internal temperature measurement
channel, return for repair.
Er 3: Circuit error in reference resistor channel, return
for repair.
Er 4: Internal temperature is out of the range.
Er 5: External temperature is out of the range.
Note:
a. Dry Bulb temperature means air (internal)
temperature. Dew point & Web Bulb are calculated
from internal temperature.
b. When the meter is on, plugging in an external
probe might cause an error (“ER 5”) in min. or max
mode. Pressing the “RESET” key could solve this error.
OPTIONAL ACCESSORIES
• External Temperature Probe part # 52231
• 33% Salt Solution (for calibration) part # 52733
• 75% Salt Solution (for calibration) part # 52775
SPECIFICATION
•Temp. Range: -20~50˚C (-4~122˚F)
• RH% Range: 0~100% RH
• Wet Bulb Range: -21.6~50.0˚C (-6.88~122˚F)
• Dew Point Range: -78.7~50.0˚C (-109.7~122˚F )
• External Temp. Range: -20~70˚C (-4~158˚F)
• Accuracy: RH% 3% at 25˚C/Temperature: 1˚F (0.6˚C)
• Response Time: 60 seconds
• Pocket Size: 24.7 (h) x 48.4 (w) x 178.5mm (l)
• Power: (2) 1.5V AAA battery
WARRANTY
This product warrants against defects in material and
workmanship for a period of one year. This warranty
does not cover failure due to abuse, improper usage, or
progressive wear and tear.
Warranty becomes valid to the original user, effective on
the purchase date. A copy of an invoice must be sent to
1 Aspen Drive, Randolph, NJ 07869 to validate the war-
ranty. For further service please contact (973) 252-9119.
ENGLISH
USA: PH (973) 252-9119
BELGIUM: TEL. + 32 (0) 3 777 28 48
www.mastercool.com
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