8-Channel cryogenic temperature monitors with RS-232 interface & TRV data-logger Antony Joby1,*, Nirdoshi Rajesh1 1Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, India *E-mail ID: jobyiuac@gmail.com
Online published on 4 December, 2023. A cost-effective 8-Channel Cryogenic Temperature monitor with an embedded RS-232 server & TRV data logger software has been successfully developed and tested at IUAC for the simultaneous measurement and logging of temperature, sensor-resistance, and sensor-voltage. This is a low-temperature device (4K to 350K) with multi-sensor support. These are recently developed for building a new distributed, 40-channel Linac thermometry and 8-channel vacuum monitoring application at IUAC. Each channel of this device can be independently configured as a Temperature or Resistance or Volt (TRV) meter using a front-panel keypad. It also offers various features like an ethernet interface, flash storage, multiple calibration curves, implementation of custom curves, a VFD display, 8 fast voltage outputs, and distributed connectivity directly to the Cryogenics control room. Each channel has 3 independent current sources (a total of 24, configured from 10 uA to 2 mA). This feature is helpful to study the self-heat effects of sensors for a variety of sensor calibration applications. The low-temperature measurement, which ranges from 4.2K to 350K, supports a wide range of sensor-curves for Silicon diodes (DT470 & DT670), Pt100, Pt1000, Carbon ceramic sensors, and any new custom sensor, etc. A 12-bit A/D converter reads sensor inputs. 6 such devices have been deployed near beam hall. A 48-channel PC-based data logger software with unlimited historical trends and a real-time viewer for the acquisition of temperature/resistance/voltage parameters are also developed. Hence these new TRV devices are now placed far off from the radiation areas (Linac beam hall) for quick access and also far from the control room (nearly 50 meters away from the device). Besides their low cost, these devices can be used in place of M/s Lakeshore 218 models in low accuracy applications as an import substitution in the future. Top Keywords Cryogenics, RS-232, Data logger, Acquisition, Sensor. Top |