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Introduction

Congratulations on your purchase of this 
multiple function PDF datalogger.
This datalogger is designed for monitoring 
temperature or temperature with humidity 
subject to quality control requirement.
Temperature and humidity measurements 
are saved throughout the entire duration of 
the measurement period.
This datalogger is equipped with a user 
defined programming function. 
The measurement report output is 
implemented using a PDF file and an 
Excel file, no unique software, 
and no USB driver are required.
Read through the instruction manual 
before using this logger. The logger is 
calibrated before shipment.

1.USB2.0 plug & play connector. USB driver is 
not required.    
2.LED indicator: 

Low/High

: Red LED blinks every 10 seconds when the 

measuring set limit value is exceeded during record. 

OK:

When the logging function is started, the green LED 

blinks once every 10 seconds when green LED blinks 
once every 10 seconds when there is no alarm occurs.
 3.NTC thermistor for temperature measuring and 
capacitive humidity sensor for humidity measuring.
4.External probe socket in models with external probe port  
5.LCD (Liquid Crystal Display).

 

 
 
 
 

 
 
 
 

Product Description 

 

 

OM-22,OM-23,OM-24

Multi-Use PDF Temperature and Humidity  Data Loggers

M5618/1016

INSTRUCTION

SHEET

Shop online at omega.co

Made in China

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SM

   e-mail: [email protected]

 

For latest product manuals: www.omegamanual.info

c. T1 is air temperature, T2 is external probe 
temperature
d. H or L displays when measuring set limit 
value is exceed.
e. MX or MI display when checking MAX or MIN 
value from logged data.
f. Low battery icon flashes on display every 
second when battery level is too low to accurately 
measure and log data.
6.Battery cover, operated by 2 pcs CR2032 batteries. 
Use coin and follow up the direction indicator to open 
and close the cover. While installing the batteries, the 
anode side faces up.
7

.

START/STOP (ON/OFF) key:

After installing the batteries, press key to power on 
the logger. LCD displays for 2 seconds. Press again 
to turn off. 
After the logger is programmed, press the Start/Stop 
button for 5 seconds to start logging. To stop logging, 
press the Start/Stop button again, for 5 seconds. 
In the logging mode, short press key won’t power off 
the logger. 

8.

MARK key:

To mark an event manually during the measurement 
period, press the MARK button for 2 seconds until the 
measured data flash three times. This MARK function 
is usually used when there is a transition, from one 
location to another. At most 8 marks will be identified 
in the PDF report.
Short press MARK button any time can also display 
the leftover battery life time as a quick reference. 
However, precise battery life time is still decided by 
operation condition & battery brand.
9.MAX/MIN key:
Press key to check the MAX or MIN data of all logged 
data. 
10.Waterproof cover and stand:
To provide USB plug waterproof feature, put on this 
cover and slightly rotate it to make it tight. To make 
logger stand on desktop, rotate this cover to suitable 
supporting angle.
11.Hanger

Step1   Configuring the data logger

It is possible to make configuration changes at 
anytime before the logging function is started. 
Once the logger is started, configuration 
changes cannot be made unless stopping the 
logging first. If the logger is locked with a 
Password, the Password is required to make 
configuration changes.
- Press ON/OFF to power on the logger
- Connect the data logger to a PC via the USB 
  port. The green LED is ON while building the 
  connection with computer.
- Windows file display window will appear.
- If the correct file folder is not open, click on 
  Folder to view files.
- Open the file " PDF Logger Configuration 
  Tool. exe".
- The default language is English. The user may 
  change it to one of several alternate languages. 
  There are English, German, French, Italian, 
  Spanish and Portuguese.
- To review the instruction manual, you may click 
  "Manual" to open the manual PDF file. 
- The user can check the calibration report for the 
   logger by selecting the PDF file named "Calibration 
   Certificate".
- User programmable parameters are as follows:

Sampling rate

Select the sampling interval you need from 30 
seconds to 2 hours. 

Alarm Limits

Select the alarm threshold values. For example: if 
2 - 8 deg C is selected, it means that an alarm 
condition will occur below 2 deg C, or above 8 deg C. 
The programmable alarm limit of each parameter is 
limited to one decimal. To summarize, to activate a 
alarm when 30 min average value of hazardous alarm 
delay period is higher than 8

, please program the 

alarm delay as 30 mins, alarm type as cumulative and 
range as 2~8°C

Time zone

Before programming the logger the user must assure 
that the PC is set for the correct time zone. The logger 
will auto synchronize to the time zone of the PC, when 
Save is pressed. Time zone changes over the transit 
distance are not adjusted in the logged data. 
The default value of above parameters are:
Sampling rate: 5 min  Alarm Type: Disable 
Start delay: 0 min     Alarm delay: 0 min
Temp. Unit: °C       Alarm Limits: 
Password: disable       Temp. blank
Company Name: blank   Ext. T: blank
Language: English       RH: blank
Once all the programming is done, press "Save" to 
confirm the setting and then you may close the setup 
window and remove the logger from PC USB port.

a. Measured temperature or humidity. LCD updates 
and interexchange every 5 seconds. 
b. REC flashes every second when logger is in 
logging mode. While logger is programmed with 
start delay, REC displays but doesn’t flash during 
the standby status.

Operation
NOTE:
1. Adobe Reader software is required. 
2. Program the logger and generate the PDF 
and Excel report at room temperature. 
For example: if the logger is removed from a 
freezer, it should be allowed to return to the 
ambient room temperature before generating 
the PDF report temperature. 
3. The executable file for programming the 
logger is named: PDF Logger Configuration Tool

Start delay

Select the start delay from 0 min to 24 hours. 
For example: If the delay is 5 minutes, and the 
sampling rate is 10 minutes, the real time to log the 
first temperature measurement is 5 minutes after 
the START button is pressed. All measurements 
after the first measurement will be at a 10 minute 
(or selected) interval.

Temperature Unit of Measurement (UoM)

Select the temperature UoM that will be displayed 
on the PDF report. The selections are Celsius, or 
Fahrenheit. Celsius is the default.

Password

The Password function is default OFF. The user 
may enable it to prevent unauthorized 
reprogramming prior to pressing the START button. 
A Password may have up to 16 alpha or numeric 
characters.

Company Name

A user defined name, or descriptor, can be input 
under Company Name. It will be displayed on the 
PDF report as the Title, with a maximum of 20 
characters.

Alarm types

Regardless of the Alarm Type, if the red LED is 
triggered, it won’t stop even the reading return to 
normal range or logging is stopped. The way to 
stop red alarm LED is to plug logger into computer 
to generate report or power off the logger.
Single: an alarm is triggered immediately when the 
measured value exceeds the alarm threshold.
Cumulative: an alarm is not triggered when the 
measured value exceeds the alarm threshold, but 
only once the overall average value during alarm 
delay duration exceeds the alarm threshold.
Disable: No alarm function during the logging 
process

Alarm delay

The preset alarm delay interval for a single alarm 
type is always ZERO.
The adjustable alarm delay interval for a cumulative 
alarm type can be 5 minutes to 2 hours.

Step2   Start the logging 

- Press "START" key for 5 seconds when you want to 
start the logging.
-“REC” will appear and flash on LCD to indicate the 
logging is activated. Measured parameters update 
and interexchange on LCD every 10 seconds.
- If Logger is programmed as Start delay, after 
pressing the start key, the “REC” will appear 
(not flashing) to show the logging is started and in 
standby status. 
-During the logging, the green LED will blink every 
10 seconds if there is no alarm occurred. If any, it 
turns into flashing red LED.
-If the red LED is triggered, it won’t stop even the 
reading return to normal range or logging is 
stopped. The way to stop red alarm LED is to 
plug logger into computer to generate report or 
power off the logger. 

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