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NGT-HTR
NGT-HTR 是专门为页岩油气开发设计制造的超高温伽马传感器。相比较上一代产品，高温性能和抗震性都有了很大的提升，并且已经在北美页岩油气板块成功应用。
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NGT-HTR Specifications
P/N 200-100-000
| Detector | Scintillator Crystal | Sodium Iodide, Na(TI) |
|---|---|---|
| Photomultiplier | R3991A (Hamamatsu)* | |
| Mechanical | Diameter (OD) | 1.36” |
| Length (make-up) | 13.6” | |
| Weight | 1.7 lb. | |
| End Connectors | Micro-D Subminiature, 15-Pin | |
| Material | Aluminum Alloy | |
| Performance | Sensitivity | 1.14 CPS/API** |
| Accuracy | +/- 5% to 150°C +/- 15% to 190°C | |
| Environmental | Operating Temperature | -18°C to 190°C |
| Survival Temperature (reduced accuracy) | -40°C to 200°C | |
| Heat/Cool Rate, Max. | 2.8°C (5°F) | |
| Vibration (3 axis) 50-1000Hz, Random | 35G (25G RMS) | |
| Shock (3 axis) | 1000G, 0.5ms, half-sine | |
| Power Requirements | DC Input Voltage | 10-50 VDC |
| Tool Current (at 28V) | 10 mA at 24°C 20mA at 190°C | |
| Output Signal | Negative Pulse | +5V to GND, 5 uSec width |
* Available upon request with R3991AH (Hamamatsu) PMT as P/N 200-101-100
** Counts are collected with gamma tool mounted within standard BeCu pressure barrel, (OD 1.875′, ID 1.500′). API Calibration performed with AEA Technology, QSA Inc., KUTh Field Verifier #188074, S/N 255 Radionuclides: K-40 (11.7%), U-238(90 ppm), Th-232(40 ppm).