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USER MANUAL DX 121 Senseca
Digital temperature probes
Guide rapide
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Close-up of a sensor probe with a blue circular graphic overlay (no text or symbols on the device itself)https://www.senseca.com

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QR code image containing encoded data, no visible human-readable textSenseca Germany GmbH
Hans-Sachs-Strasse 26
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USB 17:05 POINT -5...+5°C Temp [°C] 0.1 Max.: 5.0 0.0 Min.: -5.0 [°C] < >The DX 121 are digital temperature probes for the PROLine series of hand-held measuring devices with digital connection (such as PRO D01, PRO D05-x, PRO 925, PRO 595)
The probes are supplied factory-calibrated, and they are ready to use.
They can be optionally supplied with an ISO 9001 factory calibration or DIN EN ISO/IEC 17025 DAkkS/AC-CREDIA calibration certificate.
The calibration data are stored in the probe, allowing for interchangeability without the need for recalibration.
Equipped with 4-pin M12 connector, connectable to PROLine measuring devices with M12 digital connection.

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TX 2 1 +Vdc 3.3V I/O RX 3 4 GNDM12 DX 121 sensor pin out
INFORMATION AND SAFETY
Read this document carefully and familiarize yourself with the operation of the product before using it. Keep this document ready to hand and in the immediate vicinity of the product so that it is always available to the personnel/user in case of doubt.
Only technically qualified persons are permitted to carry out commissioning, operation, maintenance and decommissioning. The personnel must have carefully read and understood the operating manual before starting any activity.
Legal notices
- For your safety, use only the manufacturer's original spare parts and accessories. We assume no responsibility for the use of other products and any resulting damage.
- The user must have adequate knowledge of the measuring process and use of the measurements. The user is liable in case of damage/danger due to misinterpretation of the measurements as a result of inadequate knowledge.
- The liability and warranty of the manufacturer for product damages and consequential damages are voided in the event of misuse, failure to comply with these operating instructions, failure to observe safety warnings, assignment to inadequately qualified technical personnel and arbitrary modifications of the device.
- No part of this document may be reproduced, modified or translated without prior written permission of the product manufacturer. In case of ambiguity between different language versions of this document, the English version applies.
- This document does not create any legally binding obligations for the product manufacturer. All legally binding obligations are included only in the General Terms and Conditions of Sale.
Correctness of content
- This document was checked for corrected contents and is subject to a continuous updating process. This does not rule out potential errors. In the event that errors are discovered or in case of suggestions to make this document more user-friendly, please inform us via the contact information given in this document.
- We reserve the right to change the product specifications and the contents of this document with-out prior notice.
Explanation of symbols used

DANGER
Warning of danger that could result in death, serious bodily injury, or serious property damage if not observed.

CAUTION
Warning of potential danger or harmful situation that may cause damage to the device or the environment if not observed.

NOTE
Action that may have a direct effect on operation or may cause an unexpected behavior.
Safety information
Fault-free operation and operational safety of the product can only be guaranteed if the general safety requirements and the specific safety requirements in this document are observed.
Do not use the product in climatic conditions other than those specified in this document.
Do not use the product in places with:
- Rapid ambient temperature variations that may cause condensation.
- Direct vibrations / shocks to the device/sensor.
• High-intensity electromagnetic fields or static electricity.
Intended use
The product is a temperature sensor. The sensor is intended exclusively for use with hand-held measuring devices in the PROLine series with digital inputs.
Foreseeable misuse
If the following notices are disregarded, personal injury or death, as well as property damage can occur.

DANGER
- Do not use in safety / emergency stop devices!
- Not suitable for use in hazardous areas (Ex-environments)!
- Not suitable for diagnostic or other medical purposes on patients!
- Not suitable for SIL (Safety Integrity Level)!
• Not suitable for children! - Do not use as PPE (Personal Protection Equipment).

CAUTION
Do not use if:
- There is visible damage to the device.
- The device is not working as expected.
- The device has been stored under unsuitable conditions for an extended period.
On suspicion that the device can no longer be operated without danger, it must be decommissioned and prevented from recommissioning with appropriate labelling.
In case of doubt, send the device to the manufacturer for repair or maintenance.

CAUTION
Penetration probes entail the risk of stab injuries due to the pointed probe. Handle penetration probes with care and fit a protective cap on the probe tip when not in use!
There is a risk of burns when measuring in high (and very low) temperatures. Use gloves if ne

DANGER
There is an immediate danger to life if live parts come into contact with the temperature sens. Therefore, do not conduct measurements on or in the direct vicinity of live parts or lines.
Never plug the temperature sensor into sockets, etc..
Disposal
Separation by material and recycling of device components and packaging must take place at the time of disposal. The valid regional statutory regulations and directives applicable at the time must be observed.

Electrical and electronic equipment marked with specific symbol in compliance with 2012/19/EU Directive must be disposed of separately from household waste. European user can hand them over to the dealer or to the manufacturer when purchasing a new electrical ar electronic equipment, or to a WEEE collection point designated by local authorities. Illegal disposal is punished by law.
Please note: Any existing batteries must be removed beforehand and disposed of separately
CONFIGURATION
For basic operation of the display device, please refer to the instructions for the display device used.
Sensor-configuration
The sensor-specific configuration for the PROLine device series can be found in the device menu under the "DX Port x" parameter (x stands for the number of the socket used)
| MENU | DESCRIPTION |
| - DX port x | Input number “x” measurement settings |
| = Probe info | Information on the connected probe |
| = Measures units | Setting of the unit(s) of measurementThe availability of the item depends on the probe connected |
| = Alarm settings | Setting of the alarm thresholds |
| ≡ Alerting | Selection of the quantity with which to associate the alarm |
| ≡ Min. Alarm (*1) | Lower alarm threshold (alarm if measure < threshold) |
| ≡ Max. Alarm (*1) | Upper alarm threshold (alarm if measure > threshold) |
| ≡ Hysteresis (*1) | Thresholds hysteresis |
| = Correction | Sensor adjustment The adjustment values can only be changed if ‘User’ is selected as the calibration type. |
| ≡ Point -5...+5 °C | Lower adjustment point of the measurement |
| ≡ Point 30...110°C | Upper adjustment point of the measurement |
| ≡ Factory defaults (*2) | Reset user corrections to factory settings(answer safety query with ‘Yes’) |
| = Calibration type | Selection of factory or user adjustment |
(*1) The item does not appear if "Alerting" is set to "Off".
(*2) The parameter is only displayed if "Calibration type" is set to "User".
Notes for user adjustment (correction)
Each sensor has 2 adjustment points. The measured value can be corrected with these points. Linear interpolation with these adjustment values takes place at the intermediate values.
Adjustment at one of the available points:
To adjust the sensor, immerse it in a reference bath (if the sensor can be immersed) or place it in an environment with a known temperature (e.g., a climate chamber).
Then select the point to be adjusted in the menu.
The current temperature measurement is shown in the upper part of the display. The exact setpoint is set in the middle part of the display.
Select the digits using the function keys (< >). To change a digit, use the up/down arrow keys.
When you are finished, press OK to confirm the value.
You can cancel the entry with the ← key if changes have not yet been confirmed.

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USB 17:05 POINT -5...+5°C Temp [°C] 0.1 Max.: 5.0 0.0 Min.: -5.0 [°C] < >TECHNICAL SPECIFICATIONS
| Sensor | Pt1000 (thin film) |
| Design types | DX 121-D3: immersion probeDX 121-I3: insertion probe |
| Measurement Range | -50 ... +250 °C |
| Resolution | 0.1 °C |
| Accuracy(at nominal handle temperature 20..30°C) | ±0.2 °C (0 °C ≤ t ≤ 100 °C)±0.2 °C +0.3% of meas. value (-50 °C ≤ t < 0 °C, 100 < t ≤ 250 °C) |
| Ambient temperature influence | < 0.01 K / K |
| Response Time (T90) | tube-∅ 3 mm: in water 0,4 m/s < 2 s,in air 2 m/s ~ 40 s |
| Operating conditions | -20...+80 °C |
| Storage Temperature | -20...+80 °C |
| Output | DX-Sensor interface M12 |
| Connection (to device) | 4-pin M12, PVC cable |
| Power Supply | 3.3 V dc |
| Current Consumption | <1 mA typ. |
| DimensionsDX 121-D3:DX 121-I3: | Length probe tube: 150 mm (standard)![]() |
| Weight | approx. 70 g (Sensor with 1m cable)approx. 91 g (Sensor with 2m cable)approx. 155g (Sensor with 5m cable) |
| Materials | probe tube: AISI 316 stainless steelHandle: Polyamide (PA6-GF30)Cable: PVC (-20...+105 °C) |
| Protection degree | IP67 |
| Directives and standards | The devices conform to the following Directives of the Council for the harmonization of legal regulations of the Member States:2014/30/EU EMC Directive2011/65/EU RoHSApplied harmonized standards:EN 61326-1:2021 Emission limits: Class BImmunity according to table 1Additional errors: < 1 % FSEN IEC 63000:2018 |
The adjustment values can only be changed if ‘User’ is selected as the calibration type.