TRIGA® Products

NLS-1000

The NLS-1000 Startup Range Channel is designed for use in a reactor instrumentation system to indicate reactor power in the startup or source region. It can be used with most existing fission chamber assemblies or neutron sensitive proportional counters. Signals from the neutron detector are fed through a preamplifier, remotely located to minimize EMI and other sources of interference, into the startup channel electronics module displaying the count rate as well as the rate of change of the log count rate in seconds or decades per minute. Logarithmic counting is used to provide a continuous indication of reactor power covering seven decades. The NLS-1000 is equipped with a high voltage power supply, and trips for loss of high voltage, high and low count rates, and period. Self test functions can sequentially check count rate, period and high voltage.

SPECIFICATIONS

MODEL NLS-1000 STARTUP RANGE CHANNEL

INPUT RANGE

Counting – 0.1 CPS to > 1 x 10⁵ CPS

LINEARITY (LOG CONFORMITY)

± 2% full scale equivalent (temperature range of 20°to 30°C)

TEMPERATURE COEFFICIENT

± 0.15% per °C maximum over 10° to 55°C

CALIBRATION/TEST

2 fixed count rates, HV trip test. Test modes selected sequentially by front panel control

RESPONSE TIME CONSTANTS

10⁴ to 10⁵ count/sec	15 msec	10 to 100count/sec	0.3 sec
10³ to 10⁴ count/sec	20 msec	1 to 10count/sec	3.0 sec
10² to 10³ count/sec	30 msec	0.1 to 1count/sec	30 sec

OUTPUTS

Local Meter	CPS or % pwr 0 to 1000 VDC high voltage -30 to +3 second period or -1 to 10 DPM
Remote Meter	0–10 V full scale, 0–1 mA full scale, 4–20 mA full scale (optional)
Recorder	0–0.1 V full scale, 0–1 V full scale
High Voltage	+300 to +800 VDC @ 2.6 watts

BISTABLE TRIPS

High voltage	High power
Period	Low count rate

(All are adjustable with two form C contacts and one logic level output per trip)

POWER REQUIRED

117 VAC + 10% 50/60 Hz @ 1.0 A