Fuji Electric NRF50 User manual

TN5A2293a 1/42
User’s Manual
Electronic Personal Dosimeter
NRF50
Fuji Electric Co., Ltd.

TN5A2293a 2/42
Introduction
This User’s Manual explains the operation of the Electronic Personal Dosimeter NRF50. It provides
descriptions of parts, functions and operational instructions for optimal use. Please make sure that you
read this manual carefully before operation.
In the event of product malfunction, contact Fuji Electric representative immediately.

TN5A2293a 3/42
Handling Precaution
Please read the following handling precautions to ensure that you use the NRF50 Electronic Personal
Dosimeter safely and avoid injury/damages. Please read this User’s Manual carefully to understand all the
precautions before using theNRF50 Electronic Personal Dosimeter.
Precautions for Use
・The Dosimeter is a precision instrument. Do not drop it or subject it to
impact.
・Keep the Dosimeter in a plastic bag for protection when use in an
environment where chemical fumes, splashes/steam, full of dust and
wastes are present.
・Handle the Dosimeter with clean, dry hands. If becomes tainted, clean it
with dry cloth.
・Do not place the Dosimeter and metal objects in the same pocket. It may
cause the Dosimeter breaking.
・Avoid use where high frequency noise. Pay attention when use near the
following devices:
1. Mobile phone
2. Local wireless phone such as Personal Handyphone System (PHS)
3. High power transceiver
4. Microwave oven
5. Radar
6. Welding machine
7. Any other spark discharging or high intensity radio wave emitting
devices
Especially keep the Dosimeter at least 5cm away from any mobile/
wireless phones
・When the battery level is critically low, read the displayed value within 10
minutes.
・Use AAalkaline battery only. During replacement, align the battery polarities
correctly.
・Prior to disposal of the used battery, protect exposed terminals with
insulating tape to prevent shorting that may cause possible heating, rupture,
or burning. Otherwise, injury or fire may result.
・Do not throw the Dosimeter or battery into a fire. Do not disassemble them.
・Keep a certain distance between the buzzer and ears to avoid the injury.
(Buzzer makes the sound over 90dB at 30 cm distance)
・Do not use the Dosimeter as a survey meter.
・If a hard impact is made on the Dosimeter, it is possible that there is a
crack on the Dosimeter. In this case, deteriorations to the capabilities in
a waterproof and a resistance of radio wave may happen.
Attention

TN5A2293a 4/42
Contents
1. Overview...........................................................................................................................................5
2. Contents............................................................................................................................................6
2.1 Standard product package............................................................................................................ 6
2.2 Model.............................................................................................................................................6
3. Precautions.......................................................................................................................................7
3.1 Operational conditions..................................................................................................................7
3.2 Other requirements.......................................................................................................................7
4. Description of Parts and Functions .................................................................................................. 8
4.1 Part names....................................................................................................................................8
4.2 Display function...........................................................................................................................10
4.3 Buzzer function ........................................................................................................................... 11
5. Parts Replacement.........................................................................................................................17
5.1 Battery replacement....................................................................................................................17
5.2 Clip replacement.........................................................................................................................18
5.3 USB connector cap replacement................................................................................................18
6. Operational Instruction ...................................................................................................................19
6.1 When starting to use...................................................................................................................19
6.2 During use (Normal operation) ...................................................................................................21
6.3 During use (When alarm is generated) ......................................................................................30
6.4 During use (When communicating)............................................................................................32
6.5 After use......................................................................................................................................32
7. Care and Maintenance...................................................................................................................33
7.1 Daily check and maintenance items...........................................................................................33
7.2 Consumable supplies..................................................................................................................33
8. Specification ...................................................................................................................................34
8.1 General Specification..................................................................................................................34
8.2 Storage data................................................................................................................................35
9. Appendix.........................................................................................................................................36
9.1 Trouble shooting table ................................................................................................................36
9.2 Disposal.......................................................................................................................................38
9.3 Calibration...................................................................................................................................39
9.4 Block diagram .............................................................................................................................41

TN5A2293a 5/42
1. Overview
The Electronic Personal Dosimeter NRF50 (hereinafter referred to as NRF50) is designed to provide
measurement of personal dose equivalent of external exposure to radiations (hereinafter referred to as
dose).
NRF50 indicates accumulated dose or dose rate. When measured dose (rate) value exceeds preset dose
(rate) alarm threshold, NRF50 will activate audible alarm and flashes LED.
By using the Dosimeter Configuration Tool and a PC, it is able to write PC-edited setting values to NRF50
and read measurement trend data from the NRF50 via communication with the device.
If it’s worn tightly to the body, energy characteristic of the NRF50 enables direct reading of personal dose
equivalent Hp(10).

TN5A2293a 6/42
2. Contents
2.1 Standard product package
(1) NRF50 1 pcs
(2) Accessory
・Battery (AA alkaline battery) 2 pcs
2.2 Model
NRF50

TN5A2293a 7/42
3. Precautions
3.1 Operational conditions
Item
Conditions
Temperature range
-10 °C to +50 °C
Relative humidity
95 % or less (No condensation)
Storage temperature
-25 °C to +50 °C
3.2 Other requirements
(1) See User’s Manual of “Dosimeter Configuration Tool” for information on parameter writing and data
reading via the device and a PC.
(2) Try turn OFF & ON the NRF50 if you encounter technical problems. See the “Troubleshooting Table”
if the problem is not recovered.
(3) Accumulated dose cannot be reset if the power-on-reset setting of NRF50 is “OFF”. In this case,
please reset the accumulated dose through theDosimeter Configuration Tool.
Attention

TN5A2293a 8/42
4. Description of Parts and Functions
4.1 Part names

TN5A2293a 9/42
Functions
1. Buzzer : It sounds when NRF5 starts its operation, alarm and monitoring
sound is generated.
2. Flash LED : Red LED on top of LCD flashes during alarm generation.
3. Auxiliary LED : Green LED flashes along to monitoring sound. Red LED flashes
along to alarm. Yellow LED flashes along to preliminary warning
alarm.
4. LCD : Liquid Crystal Display Indicator.
5. Battery Cap : Cap of battery compartment.
6. Operating Button : Switch indication screen. Also, some operation parameters such as
alarm threshold can be changed by these buttons.
7. Calibration Mark : Shows location of calibration reference point. (Sensor position)
8. USB Connector : For power supply or communication by connecting USB cable.
9. Infrared window : For communication with infrared communication device.
10. Call Button : Emergency alarm button. Press for more than 3 seconds to generate
warning sound and indication. If user does not use this emergency
alarm, the function can be made void by the Dosimeter Configuration
Tool.
11. EPD Information : For indicating model and serial number of the NRF50.
12. Clip : To fix the NRF50 on the chest pocket or on the waist belt.

TN5A2293a 10/42
4.2 Display function
LCD Indication
■Normal condition
■Alarm condition
Note1: During normal operation, “:” for time indication flashes.
Note2: Battery life indicates remaining voltage as follows.
d: Accumulated dose
dr: Dose Rate
*[D/DR] is selectable
instead of [d/dr]
via Dosimeter
Configuration Tool
d: Accumulated dose
dr: Dose Rate
*[D/DR] is selectable
instead of [d/dr]
via Dosimeter
Configuration Tool
Icon area
Date indication
[Note1]
Battery life indication
[Note2]
Accumulated
dose
or
Dose rate
Unit
Date indication
[Note1]
Battery life indication
[Note2]
Accumulated
dose
or
Dose rate
Alarm/Warning info
Unit of
measurement
Icon area
More than
1.4V
More than
1.3V
More than
1.2V
More than
1.1V
Less than
1.1V (Low)

TN5A2293a 11/42
4.3 Buzzer function
4.3.1 Audible signal
Audible signals sound under the following circumstances:
Circumstance
Audible signal sounds when
Beep pattern
Turn ON/OFF
NRF50 is turned on
NRF50 is turned off
No sound
Contact to Dosimeter
Configuration Tool
Communication starts
No sound
Data transmission
Successful completion of data transmission
No sound
Setting values of NRF50 are changed using
a Dosimeter Configuration Tool
Data transmission failed
No sound
30msec
Beep
30msec
Beep
Beep
500msec
500msec

TN5A2293a 12/42
4.3.2 Audible alarms
Alarm activation and beep pattern are configurable by user with Dosimeter Configuration Tool. When
multiple alarms happen, alarm pattern is determined by alarm priority.
Alarm priorities are as follows:
Priority
Alarm
Remarks
1
Memory error
Breakdown
2
RTC error
Breakdown
3
Emergency alarm
4
Detector optical check error
5
Accumulated dose overload
6
Dose rate overload
7
Time alarm
8
Accumulated dose alarm
9
Dose rate alarm
10
Accumulated dose warning
11
Dose rate warning
12
Low battery voltage
13
Calibration due expiration
14
Communication error (radio, BT, USB)
Component failure

TN5A2293a 13/42
Initial setting value of alarm activations and beep patterns are as follows:
(1) Dose (rate) alarm
Alarm type
LCD indication
Buzzer
Vibration
LED/Backlight
Accumulated dose
alarm
When overload
Sounds 3 times
per 1 second
Vibrates 1 time
per 1 second
Flashes 1 time
per 1 second
Alarm:
Flash LED +
Auxiliary LED
(RED)
Warning:
Auxiliary LED
(YELLOW)
RED/YELLOW
backlight
flashes 1 time
per 1 second
Accumulated dose
warning
Dose rate alarm
When overload
Sounds 2 times
per 1 second
(Long beep)
Dose rate warning
Alarm pattern

TN5A2293a 14/42
(2) Operation time alarm
Alarm type
LCD indication
Buzzer
Vibration
LED/Backlight
Time alarm
*Indication (HH:MM) is
operating time
(increasing)
Sounds 1 time
per 1 second
(Short sound)
Vibrates 1 time
per 10 seconds
Flashes 1 time
per 10 seconds
Flash LED +
Auxiliary LED
(RED)
RED backlight
flashes 1 time
per 1 second
Alarm pattern
(3) Low battery voltage
Alarm type
LCD indication
Buzzer
Vibration
LED/Backlight
Low battery
voltage
*Count down remaining
operation time to turn off
Sounds 3 times
per 10 minutes
(Short sound)
No vibration
Flashes 1 time
per 10 seconds
Auxiliary LED
(RED)
No backlight
Alarm pattern

TN5A2293a 15/42
(4) Indication of abnormality
Alarm type
LCD indication
Buzzer
Vibration
LED/Backlight
Detector optical
check error
Sounds 4 times
per 1 second
Vibrates 1 time
per 1 second
Flashes 1 time
per 1 second
Flash LED +
Auxiliary LED
(RED)
RED backlight
flashes 1 time
per 1 second
Memory error
Memory error
(When
measurement
stops)
RTC error
RTC error
(When
measurement
stops)
Emergency alarm
Alarm pattern

TN5A2293a 16/42
(5) Calibration due expiration and communication error
Alarm type
LCD indication
Buzzer
Vibration
LED/Backlight
Calibration due
expiration
No buzzer
No vibration
No LED
Yellow
backlight
flashes 1 time
per 1 second
Radio
communication
error
(Detected
component failure
when turning on)
Bluetooth error
(Detected
component failure
when turning on)
USB error
(Detected
component failure
when turning on)
4.3.3 Monitoring Sound
Buzzer sounds 1 time for a short period, if accumulated dose reaches a preset value of dose interval
for monitoring sound. Monitoring sound interval can be chosen from 6 types, “OFF”, “10 mrem”, “1
mrem”, “0.1 mrem”, “0.02 mrem” and “0.01 mrem”. Please see User’s Manual of “Dosimeter
Configuration Tool”for details.

TN5A2293a 17/42
5. Parts Replacement
5.1 Battery replacement
Follow these steps to replace the batteries:
(1) Press and hold “◎”button to turn
NRF50 off.
(2) Open the cap of battery compartment
using a coin or coin driver.
(3) Replace the batteries.
Insert new ones properly in the
compartment with care to check the
directions “+” and “-“.
(Both batteries are positioned in the
same direction)
(4) Close the cap and tighten with a coin or
coin driver.
* NRF50 can be operated even by one battery.
1. When replacing batteries, make sure to turn off NRF50.
2. During replacement, align the battery polarity correctly.
3. Use only AAAlkaline battery.
Attention
Close
Open
Use a coin to open
＋
－
Coin driver
Battery polarity sign

TN5A2293a 18/42
5.2 Clip replacement
Follow these steps to replace the clip:
Removal of the clip
(1) Pull the clip hook
(2) Pull the clip down keeping the clip hook
away from the dosimeter.
Mounting of the clip
(1) Push the clip up until the clip hook
closely inserted to the disimter
5.3 USB connector cap replacement
Removal of the USB connector cap
(1) Open the USB connector cap.
(2) Turn a screw down with a Phillips-head
screwdriver and take off the USB
connector cap.
The way of put on the USB connector cap
(1) Put on the USB connector cap and turn
a screw up with a Phillips-head
(2) Close the USB connector cap.
Top view
Pull the hook
Removal of the
clip
Mounting of the clip

TN5A2293a 19/42
6. Operational Instruction
6.1 When starting to use
(1) Press and hold “◎” button for more than 3 seconds to start the NRF50.
Confirm the power is ON (Backlight and LED check, one time short beep sound) and LCD displays an
initial screen.
Check items
Confirmation method
Audible signal (1 beep)
Short beep sound is generated when dosimeter is turned on.
Indicated dose value
0.0 mrem or 0.0 mrem/h (Accumulated dose may not be 0.0 mrem if the
power-on-reset setting of NRF50 is “OFF”.)
LCD
〔Normal display〕
When accumulated dose is 0.0 mrem
〔Example of abnormal display〕
When generating alarm for low battery
In case NRF50 is left without battery for more
than 1 day
DATE SETUP & TIME SETUP
Normal condition

TN5A2293a 20/42
(2) White backlight turns on by pressing any of “◎”, “△” or “▽”button.
Display of accumulated dose (rem) and dose rate (rem/h) can be switched by pushing
the button of “△” or “▽”. “◎”button can also switch the display to other screens.
Please see section 6.2 in details for screen change methods by “◎”button.
(3) Put NRF50 in the chest pocket as shown below.
※Direction of NRF50:
As EPD is viewed from wearer, operation button and auxiliary LED must be positioned so that they are in
the right side from wearer’s point of view, and buzzer faces outward.
Human body
Pocket