Optris CT-LT15CB15 Non-Contact Infrared Thermometer
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Product Information
The Optris CT-LT15CB15 is a two-piece industrial non-contact infrared thermometer designed for precise surface temperature monitoring across a measurement range of -50 °C to 975 °C. Manufactured by Optris as part of the Optris CT product family, model LT15CB15 separates its miniaturized M12 stainless steel sensing head from the main signal processing unit via a factory-integrated 15-meter high-temperature cable. Featuring a 15:1 optical resolution and a spectral response of 8 to 14 µm, the passive sensing head is capable of operating in high-ambient environments up to 180 °C without requiring active external cooling.
System integration relies on standard analog outputs including scalable 0/4–20 mA, 0–5/10 V, and thermocouple Type J or K emulation, alongside dual digital alarm outputs. Optional digital communication cards can be fitted to support USB (ACCTRIUSBK), RS485 Modbus RTU (ACCTRI485M), PROFIBUS DP (ACCTRIPDPK), CANopen, RS232, and Ethernet (ACCTRIETK) networks. Commissioning a replacement unit requires configuring target emissivity between 0.100 and 1.100, defining output scaling, and setting signal hold functions. Parameters can be entered directly via the internal keypad and LCD panel or uploaded using Optris Compact Connect PC software, with pre-configuration assistance available through ABC Industrial Parts.
System health and process diagnostics are provided through alphanumerical fault codes on the internal LCD, secondary analog head temperature monitoring on Channel 2, or real-time diagnostic screens in Optris Compact Connect. Operational status codes immediately indicate out-of-range temperatures (OVER/UNDER), head overheating (ERR001), or sensor cable disruptions (ERR004). While external wiring, power supply limits between 8 and 36 V DC, and cabling can be inspected on site, hardware faults like corrupted EEPROM calibration memory (ERR010) are non-serviceable in the field, making a direct unit replacement or repair from ABC Industrial Parts the fastest solution to minimize process downtime.
Technical Specifications
| Manufacturer | Optris |
| Part Number | CT-LT15CB15 |
| Model / Type | LT15CB15 |
| Product Family | Optris CT |
| Component Type | Infrared Thermometer |
| Temperature Measurement Range | -50 °C to 975 °C |
| Optical Resolution | 15:1 |
| Spectral Range | 8 - 14 µm |
| System Accuracy | ±1.0 % |
| Repeatability | ±0.5 % |
| Thermal Resolution (NETD) | 0.1 K |
| Response Time (95%) | 150 ms |
| Emissivity Range | 0.100 - 1.100 |
| Supply Voltage | 8 - 36 V DC |
| Maximum Current Draw | 100 mA |
| Sensor Cable Length | 15 m |
| Sensing Head Operating Temperature | -20 °C to 180 °C |
| Electronics Box Operating Temperature | up to 85 °C |
Programming and Configuration
The Optris CT-LT15CB15 allows full parameter configuration using either the internal LCD panel and three keys inside the die-cast aluminum electronics box or via the Optris Compact Connect PC software. Key configurable parameters include emissivity adjustment from 0.100 to 1.100, custom analog output range scaling, alarm threshold levels, and signal processing settings such as peak hold, valley hold, or average calculation.
When commissioning a replacement pyrometer, exact alignment of these parameters is necessary to maintain system measurement consistency. Saved parameter files can be downloaded directly to the unit over an installed USB or fieldbus extension card using Optris Compact Connect, enabling fast recovery of sensor profiles.
Communication and System Integration
Standard hardware outputs on the CT-LT15CB15 include scalable main analog outputs configured for 0–20 mA, 4–20 mA, 0–5 V, 0–10 V, or thermocouple Type J and K emulation. A dedicated second analog output channel provides continuous sensing head temperature feedback to monitor thermal stress at the measurement head. Dual open-collector digital alarm outputs are also included for direct threshold switching.
For direct fieldbus integration into PLC and control networks, the main electronics unit houses a plug-in expansion slot. Supported interface options include USB (ACCTRIUSBK), RS485 Modbus RTU (ACCTRI485M), PROFIBUS DP (ACCTRIPDPK), Ethernet (ACCTRIETK), RS232, and CANopen.
Diagnostics and Status Indication
System diagnostic reporting is available directly via alphanumeric fault codes rendered on the internal LCD, continuous thermal readings of the head on Analog Output Channel 2, and real-time monitoring windows within Optris Compact Connect software.
The internal LCD provides immediate feedback during fault conditions by displaying discrete error codes covering target temperature range breaches, sensing head or box over-temperature conditions, sensor cable breaks, and calibration EEPROM faults.
Replacement and Spare Part Considerations
When installing a replacement Optris CT-LT15CB15, confirm that the replacement model features the identical 15:1 optics and factory-fitted 15-meter cable. Because the high-temperature cable is permanently attached between the M12 stainless steel sensing head and the main electronics box, the unit must be replaced as a complete two-piece assembly.
Prior to putting a replacement pyrometer into service, parameter values from the existing unit—including target emissivity (0.100 to 1.100), analog signal scaling, alarm points, and optional digital fieldbus settings—must be programmed into the replacement device using either the built-in LCD programming keys or Optris Compact Connect software.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OVER | Over Temperature Range | Object temperature above upper limit of selected measuring range | Target object temperature exceeds maximum calibrated range (975 °C) or incorrect temperature range configured | Check process temperature or adjust configured measuring range limits in setup |
| UNDER | Under Temperature Range | Object temperature below lower limit of selected measuring range | Target object temperature is below minimum calibrated range (-50 °C) or incorrect range configured | Check process temperature or adjust configured measuring range limits in setup |
| ERR001 | Sensing Head Temperature Too High | Temperature of the sensing head has exceeded allowable operating threshold (> 180 °C) | Ambient temperature at sensing head location exceeds 180 °C; cooling jacket failed or insufficient air purging | Protect sensing head against overheating; check cooling/air purge jacket airflow or water supply |
| ERR002 | Sensing Head Temperature Too Low | Temperature of the sensing head is below allowable operating threshold (< -20 °C) | Ambient temperature at sensing head location is below -20 °C | Ensure ambient operating conditions around sensing head remain above -20 °C |
| ERR004 | Sensing Head Fault / Cable Disconnect | No connection to sensing head or cable break | Sensing head disconnected from electronics box, broken wire in 15m cable, or damaged sensing head element | Check cable connection between head and box; verify cable integrity. If cable or head is permanently damaged, return unit for repair |
| ERR008 | Electronics Box Temperature Too High | Temperature inside electronics box exceeded allowable operating threshold (> 85 °C) | Ambient temperature at electronics box location exceeds 85 °C | Relocate electronics box to a cooler location or provide enclosure cooling |
| ERR010 | EEPROM / Calibration Memory Fault | Calibration data corrupt or internal EEPROM access error | Internal EEPROM failure or corrupted calibration memory | Internal hardware fault — power cycle unit; if error persists, return unit to manufacturer for service/repair |
Frequently Asked Questions
What is the optical resolution and measurement range of the Optris CT-LT15CB15?
The Optris CT-LT15CB15 features a 15:1 optical resolution (distance-to-spot ratio) and measures surface temperatures across a range of -50 °C to 975 °C.
What ambient operating temperatures can the sensor head and electronics box handle?
The miniaturized stainless steel sensing head operates in ambient temperatures from -20 °C to 180 °C without active cooling. The separate aluminum electronics box operates in ambient temperatures up to 85 °C.
How are parameters configured on the CT-LT15CB15?
Settings such as emissivity, analog output limits, and signal hold options can be set using the internal LCD panel and three keys inside the electronics box, or via Optris Compact Connect software when a digital interface card is fitted.
What output signals are supported by default?
Standard outputs include scalable 0/4–20 mA, 0–5/10 V, and thermocouple Type J or K emulation, alongside dual digital alarm outputs and a second analog channel dedicated to head temperature.
What does the ERR004 diagnostic fault code mean?
Code ERR004 indicates a loss of connection or cable break between the sensing head and the electronics box, caused by terminal disconnection, a damaged 15m cable, or an internal sensor failure.
Can an ERR010 memory error be fixed in the field?
ERR010 represents an internal EEPROM calibration memory fault. If power cycling the unit does not clear the error, internal hardware or calibration service is required.
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Disclaimer:
We are not an authorised distributor of Optris.
Product photos are for illustration purposes only and may differ from the actual product delivered.
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