Related Manuals for senseca PRO 921
Summary of Contents for senseca PRO 921
- Page 1 OPERATING MANUAL PRO 921 PRO 925 Multifunction meters / loggers with thermocouple inputs P-000106-03-EN 04/2025...
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Page 2: Table Of Contents
PRO 921 / PRO 925 – Multifunction meters / loggers Contents General information ..........................4 1.1 Product identification .......................... 4 1.2 Safety information ..........................5 Overview ..............................6 2.1 Scope of delivery ............................ 6 Description............................. 7 Preparing the instrument ........................9 Measurement mode ......................... - Page 3 PRO 921 / PRO 925 – Multifunction meters / loggers 14 Attachable probes and accessories ..................... 37 Page 3 of 38...
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Page 4: General Information
PRO 921 / PRO 925 – Multifunction meters / loggers 1 General information Read this document carefully and familiarize yourself with the operation of the device before using it. Keep this document ready to hand and in the immediate vicinity of the device so that it is always avail- able to the personnel/user in case of doubt. -
Page 5: Safety Information
PRO 921 / PRO 925 – Multifunction meters / loggers 1.2 Safety information Fault-free operation and operational safety of the device can only be guaranteed if the general safety requirements and the specific safety requirements in this document are observed. -
Page 6: Overview
(Volumetric Water Content). Any standard K thermocouple probe can be connected. Configurable surface correction fac- tors can be set for use in combination with Senseca contact thermocouple probes, for the best measuring accuracy. For each displayed variable, minimum, average and maximum values can be detected. The user can reset the statistical info to start a new statistical calculation. -
Page 7: Description
PRO 921 / PRO 925 – Multifunction meters / loggers 3 Description Input with M12 connector for DX series digital probes. Left function key: runs the command shown at the bottom left on display. OK key: confirms the selection. key: in measurement display cycles through the various available visualization modes;... - Page 8 PRO 921 / PRO 925 – Multifunction meters / loggers 12. Right function key: runs the command shown at the bottom right on display. 13. Foldable stand: pull to open the stand. 14. Magnet, for attachment to metal surfaces. 15. Battery compartment fixing screw.
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Page 9: Preparing The Instrument
PRO 921 / PRO 925 – Multifunction meters / loggers 4 Preparing the instrument Power supply The instrument is powered by 4 AA size alkaline batteries, already assembled in the device as standard. If for some reason (e.g., shipping rules) the batteries are not already assembled, unscrew the battery cover fixing screw and remove the cover, then insert the batteries as shown below. -
Page 10: Measurement Mode
PRO 921 / PRO 925 – Multifunction meters / loggers 5 Measurement mode To switch on the instrument, press the ON/OFF key. After a few seconds, the instrument dis- plays the measured values. Note: when the instrument is turned on for the first time, it automatically enters the menu displaying some factory settings (language, date/time, etc.);... -
Page 11: Hold Function
PRO 921 / PRO 925 – Multifunction meters / loggers One parameter displayed numerically and graphically. Up to 3 parameters can be displayed graphically, selectable in the Chart setup → Channel select menu. The left function key Settings is a shortcut to the Chart setup menu. -
Page 12: Reset Of The Statistical Values
PRO 921 / PRO 925 – Multifunction meters / loggers 5.3 Reset of the statistical values To reset the statistical values, press the left function key (Select) in the measurement screen with the maximum/medium/minimum values, select with the down/up arrow keys the meas- urement whose statistical values should be reset (the selected measurement is highlighted in negative), then press the left function key (Clear). -
Page 13: Configuration
PRO 921 / PRO 925 – Multifunction meters / loggers 6 Configuration Press the MENU key to enter the configuration menu. The menu is structured in levels. The current level is indicated by the number of overlapping bars in the menu header:... - Page 14 PRO 921 / PRO 925 – Multifunction meters / loggers MENU DESCRIPTION USB mode Configurable only in PRO 925 between COM interface (for logging and ‒ serial communication) or Mass storage (for viewing logging files from PC). In PRO 921 the mode is always COM interface.
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Page 15: Configuring A Parameter
PRO 921 / PRO 925 – Multifunction meters / loggers MENU DESCRIPTION Measuring rate Only DX 210/240 probes. Selection of Low or High rate. The item does not appear if "Alerting" is set to "Off"; to display the item, first select a meas- ure/channel to associate the alarm with. -
Page 16: Selecting And Sorting The Quantities To Be Displayed
PRO 921 / PRO 925 – Multifunction meters / loggers 6.3 Selecting and sorting the quantities to be displayed The Measures list menu item allows choosing which quantities to display and in which order. Enabled quantities are marked by the check mark. To enable or disable a quantity, select it with the down/up arrow keys, then press the right function key (Select or Unselect depending on whether the quantity is disabled or enabled). -
Page 17: Favorite Functions (Menu Shortcuts)
PRO 921 / PRO 925 – Multifunction meters / loggers 6.4 Favorite functions (menu shortcuts) Frequently used menu items can be added to a list of favorite functions so that they are easily accessible without the need to navigate the menu structure. -
Page 18: Protected Mode
PRO 921 / PRO 925 – Multifunction meters / loggers 6.5 Protected mode The configuration of the instrument can be protected with a numeric code (PIN) that is re- quired to access the menu or send serial commands. By default, the protected mode is disabled. To enable the protected mode, select Settings →... -
Page 19: Measurement Basics
PRO 921 / PRO 925 – Multifunction meters / loggers 7 Measurement basics The type of digital probe connected is automatically recognized by the instrument. The probe is factory calibrated and the calibration data are stored in the probe, which sends the meas- ured value directly to the instrument. - Page 20 PRO 921 / PRO 925 – Multifunction meters / loggers 7.3 Pressure measurement Depending on the probe connected, the instrument measures absolute, relative or differential pressure. Before detecting relative or differential pressures, verify the need to perform zeroing of the pressure measurement by leaving the probe inputs open.
- Page 21 PRO 921 / PRO 925 – Multifunction meters / loggers Air quality better Air quality worse than average than average VOC Index Background value VOC Index Air quality VOC Index < 50 Much better than average 50 < VOC Index < 100 Slightly better than average 100 <...
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Page 22: General Warnings On Probes Usage
PRO 921 / PRO 925 – Multifunction meters / loggers 7.7 General warnings on probes usage For temperature or other measurements that are automatically temperature compensated, wait for thermal equilibrium between the sensitive part of the probe and the area to be meas- ured before taking the measurement. -
Page 23: Measurement Adjustment
PRO 921 / PRO 925 – Multifunction meters / loggers 8 Measurement adjustment For some quantities it is possible to apply a correction to the measurement or calibrate the probe at one or multiple points. Notes on measurement adjustment of digial probes: Correction/calibration of digital probes is possible only if the user calibration type is set in the instrument (Port 1 →... - Page 24 PRO 921 / PRO 925 – Multifunction meters / loggers • DX 115 / DX 310 / DX 311 probes It is possible to calibrate the temperature in 1, 2 or 3 points, or to characterize the Pt100 sensor by entering the parameter R (resistance at 0 °C) and the coefficients A, B and C of...
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Page 25: Relative Humidity
PRO 921 / PRO 925 – Multifunction meters / loggers Offset in DX 330 probe: Correcting the temperature with the Offset option in the DX 330 probe is absolutely similar to calibration in a point: the current measurement is shown in the upper part of the display, and the correct measurement value should be set in the center. - Page 26 PRO 921 / PRO 925 – Multifunction meters / loggers In the upper part of the display, the current temperature measurement is shown, useful in case a salt saturated solution, whose relative humidity value depends on the temperature, is used for calibration.
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Page 27: Differential Pressure
PRO 921 / PRO 925 – Multifunction meters / loggers 8.3 Differential pressure Select Port 1 → Correction → Diff pressure. Available options are: o Point “-p”: calibration at a negative value “-p”. o Point 0 hPa: zero calibration. o Point “+p”: calibration at a positive value “+p”. - Page 28 PRO 921 / PRO 925 – Multifunction meters / loggers 8.4 Atmospheric pressure In the DX 330 probe, an offset can be added to the atmospheric pressure measurement by selecting Port 1 → Correction → Atm. Pressure → Offset. In the upper part of the display, the current atmospheric pressure measurement is shown. In the center of the display, the exact calibration value should be set (0…1200 hPa).
- Page 29 PRO 921 / PRO 925 – Multifunction meters / loggers After pressing OK, the instrument performs a procedure to verify the stability of the meas- urement: wait for the completion of the procedure, avoiding standing too close to the probe so as not to alter the measurement.
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Page 30: Logging (Pro 135.2 Only)
PRO 921 / PRO 925 – Multifunction meters / loggers 9 Logging (PRO 925 only) The logging function stores in the memory of the instrument the detected measurements, along with the date and time of each sample. Data recording can be automatic, according to the set interval, or single (manual). -
Page 31: Viewing The Logged Data
PRO 921 / PRO 925 – Multifunction meters / loggers Multiselect mode: Operation is similar to standard mode, except that the check mark always remains visible next to all labels that are selected (in standard mode only the last label selected is marked with the check mark). -
Page 32: Serial Communication
PRO 921 / PRO 925 – Multifunction meters / loggers 10 Serial communication Serial commands can be sent to the instrument, to read the instrument information and the measurements. To send serial commands to the instrument, the USB mode menu item must be set to COM interface. -
Page 33: Battery Management
PRO 921 / PRO 925 – Multifunction meters / loggers 11 Battery management If the external power supply is not connected, the battery symbol on the display indicates the battery charge level. If the battery charge is insufficient to ensure a correct measurement, the instrument turns off. -
Page 34: Maintenance
PRO 921 / PRO 925 – Multifunction meters / loggers 12 Maintenance It is recommended to perform a calibration check of the instrument and connected probes an- nually at accredited laboratories. 12.1 Cleaning Do not use aggressive cleaning agents or incompatible with the materials indicated in the technical specifications. -
Page 35: Technical Specifications
PRO 921 / PRO 925 – Multifunction meters / loggers 13 Technical specifications K thermocouple measurement specifications Measuring range -220.0…+1372.0 °C / -364.0…+2501.6 °F Resolution 0.1 °C / 0.1 °F Accuracy ±(0.2 °C + 0.2% of measured value) ± 1 digit Cold junction accuracy ±0.3 °C... - Page 36 PRO 921 / PRO 925 – Multifunction meters / loggers Dimensions 170 x 80 x 38 mm Weight 350 g approx. Housing material ABS, TPE (side protection), Polyester (front panel) Page 36 of 38...
- Page 37 PRO 921 / PRO 925 – Multifunction meters / loggers 14 Attachable probes and accessories For the available thermocouple temperature probes and DX series digital probes, please visit Senseca website. Accessories: CASE PRO-400 Case for PRO Line. Recess for one instrument, space for accessories, car- rying handle, zipper.
- Page 38 Senseca Germany GmbH Hans-Sachs-Strasse 26 93128 Regenstauf GERMANY info@senseca.com...
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