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Portable Low Cost Data loggers- Part of the Nomad® Family
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
OM-PL Series
  • Measure and Record Temperature, Relative Humidity, Pressure, 4 to 20 mA, AC Voltage and AC Current
  • Selectable Sample Rate: 1 Second to 18 Hours (1 Second Increments)
  • Real Time Data Monitoring
  • High/Low Alarm Threshold Settings
  • Visual Alarm Indication
  • User Selectable Recording Start (Specified Date and Time, Immediate After Setup or on Door Close)
  • 20 Month Battery Life (at 1 Minute Sample Rate)
 Manuals (contact with email : [email protected])


The OM-PL Series data loggers areversatile devices that can be usedfor a wide range of loggingapplications. Each data logger iscapable of sampling data as fast asonce per second or as slow as onceevery 18 hours. The data logger canstop recording when memorybecomes full, or rollover forcontinuous recording. The start ofrecording is software selectable tobe immediate, delayed, or initiatedwhen the datalogger door is closed.The data loggers can also be usedto monitor high and low alarmevents, that indicate if the recordeddata passed above and/or below theuser selected threshold. The alarmevents are stored separately fromthe data samples and are notaffected by data rollover. When therecorded data passes the high orthe low alarm threshold, thedata logger records the time of thealarm. When the recorded datareturns to within the acceptablerange, the data logger records theduration of the alarm. Up to 50 suchalarm events can be recorded. Thedatalogger has a visual indication ofan alarm condition without the needto connect to the computer.

The data loggers have an internalreal time clock/calendar. This realtime clock is used to record the timestamps for data samples and alarmevents. This real time clock isindependent of your computer clock,and can be set separately, or set tomatch your computer clock. Thedata loggers provide a high level ofdata security. They have physicalsecurity, where the data accessdoor is locked, and softwaresecurity. It is virtually impossible tofalsify the sample data or alarminformation of the OM-PL Seriesdataloggers. The data loggers areextremely low power. Under normaloperating conditions, a 9 voltalkaline battery will last from 18months to 2 years.

OM-PL Series data loggers havethe capacity to store over 10,000readings. Simply connect thedatalogger to your PC’s serial portand use the available Windowssoftware to set up the parametersfor your recording session. Once thedatalogger is set up you candisconnect it and put it in the field torecord data. The data logger doorcan be locked on to preventaccidental or intentional disruptionsof the recording session. Whenrecording is completed, reconnectthe data logger to your PC anddownload the recorded data usingthe Windows software. TheWindows software allows you toview recorded data in text orgraphical format. Models areavailable to record internaltemperature and an externaltemperature channel (OM-PLT2),two external temperature channels(OM-PLTT), temperature, humidityand dew point (OM-PLTH),temperature and pressure(OM-PLPT), AC currentand voltage (OM-PLCV),4 to 20 mA (OM-PL420), andinternal temperature and an externalthermocouple input (OM-PLTC).

Operating Temperature Range(Datalogger):

0 to 60°C(32 to 140°F) using alkaline battery;
-40 to 65°C (-40 to 150°F) usinglithium battery
Humidity: 0 to 95% RH,non-condensing
Storage Temperature: -40 to 77°C(-40 to 170°F)
Time Accuracy: ±100 ppm @ 75°F
Power: 9 V alkaline or lithiumbattery
Battery Life (average use): 20months using alkaline battery,
40months using lithium battery
Dimensions: 7.6 x 6.4 x 2.8 cm(3 x 2.5 x 1.1")
Weight: 71 g (2.5 oz)
Software: XP/Vista/7/8 (32-bit and 64-bit)
Measurement Interval: 1 secto 18 hrs
(selectable in 1 secondincrements)
Computer Interface: RS-232standard;
for computers with onlya USB port,
use model no.OM-PL-USBS (RS-232/USBadaptor)

one internal temperaturechannel and one
externaltemperature channel
Sample Point Capacity:
21,500points for single channel;
10,750points per channel for dual channel
Alarms: high and low alarms
forinternal and external channel
Temperature Range: internalsensor;
0 to 60°C (32 to 140°F) withalkaline battery,
-40 to 65°C (-40 to150°F) with lithium battery:
externalsensor; -40 to 65°C (-40 to 150°F)
Accuracy: ±0.5°C (±1.0°F)
Resolution: 0.05°C (0.1°F)
External Probe TemperatureRange:
-40 to 65°C (-40 to 150°F)
Calibration: single point offsetcalibration available throughsoftware

two external
temperature channels
Sample Point Capacity: 21,500
temperature points for single
channel (1 probe); 10,750
temperature points per channel
for dual channel (2 probes)
Alarms: high and low alarms
foreach probe
External Probe TemperatureRange:
-46 to 150°C (-50 to 300°F)
Accuracy: ±1°C (±2°F)
Resolution: 0.05 °C (0.1°F)
Probe: 76 mm (3") stainless steeltip,
1.8 mm (6') cable
Calibration: single point offsetcalibration available throughsoftware
Battery Life (average use): 20months using alkaline battery,
40months using lithium battery

two internal channels(temperature and humidity);
two calculated channels (dew pointand wet bulb)
Sample Point Capacity: 21,500 fortemperature only;
10,750 points fortemperature, humidity and dewpoint
Alarms: high and low alarms
fortemperature & humidity.
Temperature Range: 0 to 60°C(32 to 140°F) with alkaline battery
-40 to 65°C (-40 to 150°F) withlithium battery
Temperature Accuracy:±1°C (±2°F)
Resolution: 0.05°C (0.1°F)
Relative Humidity Range:
0 to 99.9% RH, non-condensing
Relative Humidity Accuracy:
±2% full scale, from 0% to 95% RH
for temperatures between 0 to 60°C(32 to 140°F)
Relative Humidity Resolution:0.1% RH
Calibration: single point offsetcalibration
available throughsoftware; humidity is factorycalibrated

two external channels;
temperature and pressure
Sample Point Capacity:
21,500points for temperature or pressure;
10,750 points for both pressure andtemperature
Alarms: high and low alarms
fortemperature and pressure
Temperature Range: -40 to 65°C(-40 to 150°F)
Temperature Accuracy:±0.5°C (±1°F)
Resolution: 0.05°C (0.1°F)
Temperature Probe: -40 to 65°C(-40 to 150°F)
Pressure Range: 0 to 500 psi
Pressure Accuracy: ±3 psi
Pressure Resolution: 0.15 psi
Pressure Sensor: stainless steelsensor 1.8 m (6') cable,
1/4 " NPTmale pressure port)
Operating Temperature Range(Pressure Sensor):
0 to 54°C(32 to 130°F)
Calibration: single point offsetcalibration available throughsoftware;
pressure is factorycalibrated


two channels,one for internal ambienttemperature
and one forexternal thermocouple input
Measurement Capacity:10,750 points for both internal
temperature and externalthermocouple input
Thermocouple Types(External Channel):
J, K, T, E, R, S (softwareselectable)
Thermocouple TemperatureRanges:
Type J;
-79 to 732°C(-110 to 1350°F):
Type K; -140 to 1038°C(-220 to 1900°F):
Type T; -148 to 349°C(-235 to 660°F):
Type E; -59 to 560°C(-75 to 1040°F):
Type R; 0 to 1449°C(32 to 2640°F):
Type S; 0 to 1449°C(32 to 2640°F)
Thermocouple Connection:
subminiature femalethermocouple jack
Accuracy (ThermocoupleChannel):
Type J,K,T;
±0.8°C (±1.5°F):
Type E; ±0.6°C (±1.0°F):
Type R,S; ±2.8°C (±5°F)
Resolution (ThermocoupleChannel): 0.05°C (0.1°F)
Accuracy (Internal Channel):±1°C (± 2°F)
Resolution (Internal Channel):0.05°C (0.1°F)
Alarms: high and low alarms
forthermocouple and ambienttemperature
Calibration: single point offsetcalibration available
throughsoftware for both internal
ambientchannel and external thermocouplechannel

one 4 to 20 mA input
Measurement Capacity:21,500 points
Alarms: high and low alarms
Input Current Range: 0 to 40 mA
Current Accuracy: ±0.05 mA
Current Resolution: 0.01 mA
Calibration: single point offsetcalibration available throughsoftware

two channels,one for AC current (measured
using supplied current probe),and one for AC voltage
Sample Point Capacity: 21,500points for current or voltage;
10,750points for both current and voltageAlarms:
high and low alarms forcurrent and voltage
Current Range: 0 to 300 Aac
Current Accuracy: ±5%
Current Resolution: 0.1 Aac
Voltage Range: 0 to 500 Vac
Voltage Accuracy: ±1 Vac
Voltage Resolution: 0.1 Vac
Calibration: single point offsetcalibration available throughsoftware; current and voltage arefactory calibrated

Sampling Interval:
User selectablefrom 1 second to 18 hours,
in 1second increments
Interface: COM (RS232) serial port.Software supports COM1 throughCOM8. Optional USB interface(model no. OM-PL-USBS).
Alarms: Visual alarms with userselectable low
and high thresholds forevery channel
Alarm Memory: Up to 50 alarmevents.
Alarm start time and alarmduration is stored
Data Security: Locking sliding doorprevents physical access to thelogger data. Unique factory set loggerID.Data collection session counter
Compatibility:XP/Vista/7/8 (32-bit and 64-bit)
Minimum System Requirements:8MB of RAM, 2M
of disk space, 800 x 600resolution, 1 free COM port or a freeUSB port
(optional USB interface isrequired: model no.OM-PL-USBS)
Recording Start: On door close,
immediate after setup, or at a userspecified date and time
Recording Mode: Stop on memoryfull,
or continuous recording withmemory rollover
Real Time Status: Visual indicationthrough the status LED. Userselectable
status display frequencyand LED brightness, Software realtime status
User Calibration: Passwordprotected calibration for each channel
User Message:Up to 30 characters
Logger Channels: User selectable.Disabling channels increases
thestorage capacityof the other channels
Units: US and Metric(user selectable units)
Data Format: Custom formatexportable to text or Excelspreadsheet.
Real Time Monitoring: Logger canbe permanently connected to thecomputer
and used as a real time,multichannel sensor with loggingcapability.
Battery does not drainwhen logger is connected to thecomputer

Images of OM-PL Dataloggers
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