Bruker CryoProbe - Cryo-Compatible Preamplifier Assembly HPPR CRP

22 (107) BRUKER CryoProbe User Manual
System description
Weight (approx.)
P/N O00245 (3 × 200 V AC, air-cooled) 140 kg
P/N O00246 (3 × 200 V AC, water-cooled) 120 kg
P/N O00247 (3 × 400 V AC, water-cooled) 125 kg
Ambient operating temperature 5 to 28°C
Air humidity (relative) max. 90%
Electricity
line voltage (± 5%) P/N O00245 AC 200 V, 50/60 Hz, 3 phase,
P/N O00246 AC 200 V, 50/60 Hz, 3 phase,
P/N O00247 AC 380 - 415 V @ 50 Hz, 3 phase,
AC 460 - 480 V @ 60 Hz, 3 phase.
power consumption maximum 8.3 kW
steady state 7.5 kW
internal fuses P/N O00245 29 A for mains, automatic
3 × 2 A for control circuit
3 × 3 A for fan
3 × 2 A for Coldhead
P/N O00246 29 A for mains, automatic
3 ×=5 A for control circuit and
Coldhead
P/N O00247 13 A for mains, automatic
3 ×=3 A for control circuit and
Coldhead
Helium gas pressure static 17.5 bar (254 psi)
operating high 21 bar (300 psi)
low 6 bar (85 psi)
Pressure relief valve setting 27.3 bar (390 psi)
Cooling water requirement (P/N O00246 and P/N O00247 only)
water flow rate: 4 - 10 L/min (240 - 600 L/h)
recommended flow rate: 7 L/min (420 L/h)
typical cooling power: 6.1/7.5 kW at 50/60 Hz
water temperature (at He Compressor inlet): 4 - 28°C
recommended water temperature: 15°C
Acoustic noise ca. 65 dB(A) 2 m distant
Cryo-compatible preamplifier assembly ‘HPPR CRP’ 3.3
0
Although a CryoProbe has its own set of cold preamplifiers built-in, some HPPR
functions such as RF filters in the transmission path, probe tuning, and selection
of the received signal must be handled externally by a modified HPPR CRP as-
sembly (Figure 3.5.
). Besides being suitable for the operation with CryoProbes,
this HPPR CRP can be used with all conventional probes. For technical informa-
tion on the HPPR CRP and its wiring, see the CRP RF Electronics Technical Man-
ual.