LUDLUM MODEL 26-2 FRISKER
USER’S MANUAL
December 2016
Serial Number PF002406
and Succeeding Serial Numbers
LUDLUM MODEL 26-2 FRISKER
USER’S MANUAL
Serial Number PF002406
and Succeeding Serial Numbers
December 2016
Model 26-2 Frisker User’s Manual
Model 26-2 Frisker User’s Manual
STATEMENT OF WARRANTY
Ludlum Measurements, Inc. warrants the products covered in this manual to be free of
defects due to workmanship, material, and design for a period of twelve months from
the date of delivery. The calibration of a product is warranted to be within its
specified accuracy limits at the time of shipment. In the event of instrument failure,
notify Ludlum Measurements to determine if repair, recalibration, or replacement is
required.
This warranty excludes the replacement of photomultiplier tubes, G-M and
proportional tubes, and scintillation crystals which are broken due to excessive
physical abuse or used for purposes other than intended.
There are no warranties, express or implied, including without limitation any implied
warranty of merchantability or fitness, which extend beyond the description of the
face there of. If the product does not perform as warranted herein, purchaser’s sole
remedy shall be repair or replacement, at the option of Ludlum Measurements. In no
event will Ludlum Measurements be liable for damages, lost revenue, lost wages, or
any other incidental or consequential damages, arising from the purchase, use, or
inability to use product.
RETURN OF GOODS TO MANUFACTURER
If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please
send to the address below. All shipments should include documentation containing return shipping
address, customer name, telephone number, description of service requested, and all other necessary
information. Your cooperation will expedite the return of your equipment.
LUDLUM MEASUREMENTS, INC.
ATTN: REPAIR DEPARTMENT
501 OAK STREET
SWEETWATER, TX 79556
800-622-0828 325-235-5494
FAX 325-235-4672
Model 26-2 Frisker User’s Manual
Table of Contents
Introduction 1
Getting Started 2
Unpacking and Repacking 2-1
Battery Installation 2-2
Instrument Operational Test 2-3
Detector Failure Diagnostics 2-4
Detector Over Range 2-4
Instrument Use and Controls 2-5
Rate Mode Operation 2-6
Max Mode Operation 2-7
Timed Frisk Mode Operation 2-8
Specifications 3
Setup Mode 4
Setup Overview 4-1
Entering Setup Mode 4-2
Default Setup Values 4-3
Setup Mode Operation 4-3
Safety Considerations 5
Environmental Conditions for Normal Use 5-1
Warning Markings and Symbols 5-1
Cleaning and Maintenance Precautions 5-2
Revision History 6
Recycling 7
Model 26-2 Frisker User’s Manual Section 1
Section
1
Introduction
The Model 26-2 is an ergonomic, lightweight instrument intended for
contamination frisking. The instrument features a large backlit LCD
(liquid crystal display), LEDs which signify alarm and non-alarm
conditions, a piercing audio warning, and easy, intuitive use in a singlehanded platform. A comfortable wrist strap and lanyard are also
included for keeping the instrument close and secure. The unit body is
made of lightweight but durable plastic. It is intended for outdoor use
and can resist splashing water.
There is also a headphone option available (not included). The
instrument can be modified to include a standard 1/8 inch headphone
jack (part number 4498-538).
Three modes of operation are available for the Model 26-2; RATE,
MAX, and TIMED FRISK. RATE mode operation measures
contamination from background levels up to 1.99 kcps or 100.0 kcpm.
MAX mode is used to capture the highest count rate detected – useful
for finding peak contamination rate, or frisking when the display is not
visible. TIMED FRISK mode allows the user to perform a
contamination frisk for a predetermined time. The display will be
automatically backlit if light levels are low. The display backlight can
also be configured for ‘Continuous On’ operation. RATE and MAX
modes can be silent or may utilize a 'click' audio; the 'click' audio is
always on during TIMED FRISK mode. RATE and TIMED FRISK
modes feature non-latching continuous tone alarms for count rates
above alarm levels. The continuous tone alarms in MAX mode will
latch with the captured highest count rate, and will clear when the MAX
count is acknowledged and then reset. The RATE, MAX, and TIMED
FRISK modes can also be disabled, simplifying the unit even further
The Model 26-2 allows up to three count rate alarm settings, which are
automatically evaluated from lowest to highest values. Four LEDs show
the current alarm status; a green LED for no alarm, and three red
LEDs, which work in combination to signify the alarm level.
Ludlum Measurements, Inc. Page 1-1 December 2016
Model 26-2 Frisker User’s Manual Section 1
The Model 26-2 utilizes a standard 15 cm2 (0.9 in2) Geiger-Mueller
"pancake" detector, which can detect alpha, beta, or gamma radiation.
Caution is needed with handling the instrument because of the thin
radiation detector's window.
Setup of the instrument is accomplished through the front-panel
buttons. The advanced user or administrator can set:
Response Rime
Auto-Response Rate (Fast or Slow)
Up to three Count Rate Alarm Levels
Frisk Time
Available Operational Modes
Setup can be disabled via the internal switch on the Model 26-2 in order
to protect settings.
The unit is operated with two AA batteries for operation from -40 to 65
°C (-40 to 150 °F). Battery life should be approximately 1000 hours
under normal usage. A low-battery indicator on the LCD warns when
less than 16 hours of battery life remain.
Ludlum Measurements, Inc. Page 1-2 December 2016
Model 26-2 Frisker User’s Manual Section 2
Section
2
Getting Started
Unpacking and Repacking
Remove the calibration certificate and place it in a secure location. Remove
the instrument and ensure that all of the items listed on the packing list are
in the carton. Check individual item serial numbers and ensure calibration
certificates match. The Model 26-2 serial number is located on a label on the
front of the unit.
To return an instrument for repair or calibration, provide sufficient packing
material to prevent damage during shipment. Be aware that the thin mica
window of the detector may be damaged (imploded) because of pressure
differentials if the unit is shipped by air. Protect the unit by putting it inside
a sealed can or other protective enclosure.
Every returned instrument must be accompanied by an Instrument
Return Form, which can be downloaded from the Ludlum website at
www.ludlums.com. Find the form by clicking the “Support” tab and
selecting “Repair and Calibration” from the drop-down menu. Then choose
the appropriate Repair and Calibration division where you will find a link to
the form.
Ludlum Measurements, Inc. Page 2-1 December 2016
Model 26-2 Frisker User’s Manual Section 2
1. Grab the ring on the screw.
2. Turn the ring one quarter turn
counter-clockwise.
3. Release and remove the battery cover.
4. Replace two each AA batteries.
5. Firmly insert the barb of the battery
cover completely into the body of the
Model 26-2.
6. Replace the cover and turn ring one
quarter of a turn clockwise to secure.
Warning: If this procedure
is not followed correctly,
and the barb is not inserted
into the body of the
instrument correctly, the
barb may break off.
Battery Installation
A low-battery indicator appears at the bottom of the LCD when less than 16 hours of battery life remain.
When this indicator is present, follow these steps to replace the two standard AA batteries:
Ludlum Measurements, Inc. Page 2-2 December 2016
Model 26-2 Frisker User’s Manual Section 2
Instrument Operational Test
Turn the instrument ON by pressing the ON/ACK button for about a
second, and then releasing. The instrument should activate all the LCD
segments and the audio, and cycle through the LEDs. Observe the device
during this time. If any LCD segments are missing, or if audio or any LEDs
fail to work, the device is in need of repair. Please refer to Figure 1 below.
Figure 1: Startup display for Model 26-2, with all LCD segments shown.
It then displays the firmware version number before displaying the current
count rate, starting at 0 cpm (or 0.0 cps). Ensure that the low-battery
indicator is not present. If the low-battery indicator is present, replace the
batteries as soon as possible. Under extremely low-battery conditions, be
aware that the unit may not even turn on or may turn itself off abruptly.
A reference reading with a check source, 1 µCi (37 kBq) of
137
Cs for
example, should be obtained at the time the instrument is received in the
field. Small check sources of radiation are available from Ludlum
Measurements. While exempt from many regulations because of their small
size, these sources are large enough to produce a response on this
instrument. The detector's position is indicated by the circular screen on the
back of the Model 26-2: the seam between the enclosure halves indicates the
approximate center of the detector. If this procedure is done routinely with
the same radiation source, instrument malfunction may be detected when
anomalous readings are observed. If at any time the instrument fails to read
within 20% of the reference reading when using the same check source, it
should be sent to a calibration facility for recalibration and/or repair.
Example log reading:
Check Source # Count Rate
Once this procedure has been completed, the instrument is ready for use.
Ludlum Measurements, Inc. Page 2-3 December 2016
Model 26-2 Frisker User’s Manual Section 2
Detector Failure Diagnostic
Note that the Model 26-2 has its own diagnostic tests to ensure that the
detector is functioning correctly. The Model 26-2 can detect when the
radiation detector is malfunctioning and will flash the display to indicate a
fault. If the detector stops detecting radiation for 60 seconds, normally
through a puncture of the thin mica window, the Model 26-2 will flash a
zero reading. If this indication is observed, remove the unit from service and
have it evaluated by a qualified repair and calibration technician.
Figure 2: Detector Failure display (shown for cpm); will also flash.
Detector Over Range
If the unit has an internal malfunction that causes it to count high or
excessively, the unit flashes the maximum rate (either 1.99 kcps or 100.0
kcpm) as a warning. The user should ensure whether this is being caused by
a high radiation field or by internal malfunction.
Figure 2: Detector Over Range (shown for cpm); will also flash.
Ludlum Measurements, Inc. Page 2-4 December 2016
Model 26-2 Frisker User’s Manual Section 2
Instrument Use and Controls
With only two front-panel buttons, the Ludlum Model 26-2 is simple and
easy to use with minimal training required. Default operation is RATE
mode, and the display shows the current count rate. Pressing the MODE
button will switch the instrument to MAX mode, which will display the
highest count rate detected. Pressing the MODE button again will switch it
to TIMED FRISK mode, which will display the Frisk timer. Note that
RATE, MAX, and TIMED FRISK modes can be locked out in the setup
process.
See the Model 26-2 front-panel drawing at the beginning of this
manual to reference the following controls:
ON/ACK button: Used to power the Model 26-2 ON and OFF, silence click
audio, reset MAX mode, start/reset the TIMED FRISK, and acknowledge
audio alarms.
Power On: Press for approximately one second and release (all LCD
segments will activate, and firmware version will be shown).
Power Off: Press for approximately five seconds (audio will beep
and LCD will clear).
Normal Operation: Will silence ‘click’ audio in RATE, MAX and
TIMED FRISK modes, reset MAX mode display, start Frisk Timer
in TIMED FRISK mode, and acknowledge/silence audio alarms in
all modes of operation.
MODE button: Used to advance between the three operating modes: RATE,
MAX, and TIMED FRISK. Will reset an active frisk in TIMED FRISK
mode. Note that RATE, MAX and/or TIMED FRISK modes may be
disabled from use by the administrator or calibrator.
ALARM STATUS LEDs: Used to indicate the current non-alarm/alarm
status, also used to signify TIMED FRISK status.
Green LED: Flashes at a medium pace during non-alarm conditions
in RATE and MAX modes, and while a frisk is active in TIMED
FRISK mode; will be steady on when a frisk is not active in TIMED
FRISK mode; will turn off during the first four seconds of
operation to signify the window for Setup Entry.
Ludlum Measurements, Inc. Page 2-5 December 2016
Model 26-2 Frisker User’s Manual Section 2
Red LEDs: Flashes in patterns to indicate the alarm level in all
modes.
o Lowest Alarm Level (Active if two or more alarms enabled)
o Middle Alarm Level (Active if all three alarms enabled)
o Highest Alarm Level (Active if one or more alarms enabled)
RATE Mode Operation
In RATE mode the current count rate will be displayed.
Under a non-alarm condition, the green LED will be flashing; pressing the
On/Ack button will turn the ‘click’ audio on/off.
If an alarm condition is present, pressing the On/Ack button will
acknowledge and turn off the continuous tone alarm audio. A change from a
lower level alarm condition to a higher level alarm condition will re-trigger
the continuous tone alarm. Under an alarm condition, the ALARM display
indicator will remain on, and the appropriate red Alarm Status LEDs will be
active. Alarms are non-latching in RATE mode.
If other operational modes are available, pressing the MODE button will
move to the next available operational mode.
Figure 1: RATE mode display showing typical background radiation rate
and the low-battery icon. Green LED will be flashing.
Ludlum Measurements, Inc. Page 2-6 December 2016
Model 26-2 Frisker User’s Manual Section 2
MAX Mode Operation
While in MAX mode, the highest detected count rate (since the last reset) is
displayed. The word MAX will be displayed when in MAX mode.
Under a non-alarm condition, the green LED will be flashing; pressing the
On/Ack button will turn the ‘click’ audio on/off. Pressing the On/Ack
button a second time will reset the display and enable the ‘click’ audio.
If an alarm condition is present, pressing the On/Ack button once will
acknowledge and turn off the continuous tone alarm audio (The ‘click’ audio
will remain as selected under non-alarm conditions). Pressing the On/Ack
button a second time will reset the display and clear the alarm condition. A
change from a lower level alarm condition to a higher level alarm condition
will re-trigger the continuous tone alarm. Under an alarm condition, the
ALARM display indicator will remain on, and the appropriate red Alarm
Status LEDs will be active. Alarms in MAX mode latch with the display.
If other operational modes are available, pressing the MODE button will
move to the next available operational mode.
Figure 2: MAX mode operation display with ALARM indicators for
Lowest Alarm Level. A single red LED will be flashing.
Ludlum Measurements, Inc. Page 2-7 December 2016
Model 26-2 Frisker User’s Manual Section 2
TIMED FRISK Mode Operation
In TIMED FRISK mode, operation depends on the current state of the
Frisk Timer.
When the Frisk Timer is not actively counting down:
The display will alternate between showing the Frisk Time for four
seconds and the current count rate for one second. The green LED
will be steady ON.
Under a non-alarm condition, pressing the On/Ack button starts
the Timed Frisk.
If an alarm condition is present, pressing the On/Ack button will
acknowledge and turn off the continuous tone alarm audio. A
change from a lower-level alarm condition to a higher-level alarm
condition will re-trigger the continuous tone alarm. Under an alarm
condition, the ALARM display indicator will remain on, and the
appropriate red Alarm Status LEDs will be active. Alarms are nonlatching in TIMED FRISK mode.
If other operational modes are available, pressing the MODE
button will move to the next available operational mode.
When the Frisk Timer is active:
The display will alternate between showing the current count rate
for four seconds and the Frisk Time remaining for one second. The
green LED will alternate between ON and OFF.
Under a non-alarm condition, pressing the On/Ack button will turn
the ‘click’ audio on/off.
If an alarm condition is present, pressing the On/Ack button will
acknowledge and turn off the continuous tone alarm audio. A
change from a lower-level alarm condition to a higher-level alarm
condition will re-trigger the continuous tone alarm. Under an alarm
condition, the ALARM display indicator will remain on, and the
appropriate red Alarm Status LEDs will be active. Alarms are nonlatching in TIMED FRISK mode.
Pressing the MODE button will cancel the current Timed Frisk and
reset the Frisk Timer. If a Timed Frisk is canceled, a long audio tone
will sound.
Completion of a Timed Frisk will be indicated with two short audio
beeps.
Ludlum Measurements, Inc. Page 2-8 December 2016
Model 26-2 Frisker User’s Manual Section 2
Figure 3: TIMED FRISK mode operation showing Frisk Timer of 3
minutes. Green LED will be steady ON.
Ludlum Measurements, Inc. Page 2-9 December 2016
Model 26-2 Frisker User’s Manual Section 3
Section
3
0
Specifications
Detector: pancake GM (Geiger-Mueller) detector, stainless steel screen
Linearity: ±10%
Window Area: Active: 15.51 cm² ( 2.4 in²); Open: 12.26 cm² (1.9 in²)
Window Protective Screen: 79% open
Efficiency (4п) Surface Plane:
125
99m
I
Tc
239
Pu
137
Cs);
Alpha: 11% for
Beta: 18% for 99Tc; 32% for 32P; 2% for 14C; 22% for 90Sr/Y;
0.2 % for
Gamma: 3300 cpm/mR/hr or 5.5 cps/μSv/hr (
≤ 1% for
Resolving Time: approximately 110 µsec as defined by IEC 60325
Alarms: up to three count rate alarm setpoints, adjustable over the display
range
Overload: high rate saturation protection, indicated by flashing display and
audio alarm, prevents false display of lower count rates
Zero Protection: after 60 seconds of no pulses from detector, unit will flash a
zero reading and the alarm audio will be triggered
LCD Display: 3½ digit LCD with large 12.7 mm (0.5 in.) digits, (k)cps,
(k)cpm, low-battery indicator, MAX, ALARM
Display Range: 0.1 cps to 1.99 kcps, or 1 cpm to 100.0 kcpm
Backlight: built-in ambient light sensor automatically activates low-power
LED backlight, unless internal dip switch 1 is set to continuous-on.
User Controls:
ON/OFF/Quiet – press to turn ON, tap to alternate between ‘click’
Ludlum Measurements, Inc. Page 3-1 December 2016
audio and QUIET, hold for OFF; press to start Timed Frisk
Model 26-2 Frisker User’s Manual Section 3
MODE – alternates between RATE (count rate), MAX ( captures peak
rate) and TIMED FRISK ( preset frisk time) modes; press to stop a
Timed Frisk
Click Audio: greater than 60 dB at 0.6 m (2 ft)
Power: two “AA” batteries
Battery Life: approximately 250 hours of operation (less if the backlight is
configured for continuous on), 16-hour low-battery warning
Construction: high-impact plastic with water-resistant rubber seals and
separate battery compartment
Environmental Rating: NEMA (National Electrical Manufacturers
Association) rating of 3 or IP (Ingress Protection) rating of 53
Distance from Surface Plane to Grill: 0.32 cm (one-eighth inch)
Size: 4.6 x 6.9 x 27.2 cm (1.8 x 2.7 x 10.7 in.) (H x W x L)
Weight: 0.45 kg (1.0 lb)
Ludlum Measurements, Inc. Page 3-2 December 2016
Model 26-2 Frisker User’s Manual Section 4
Section
4
Setup Mode
Warning!
Only advanced users or administrators should consider changing
any of the parameters in the following section. Incorrect settings
could jeopardize the safety of users depending on this instrument.
Setup Overview
Your instrument has been shipped from Ludlum Measurements only after
passing electronic checkout, a 30-hour burn-in process, and a careful calibration
process. Calibration papers are supplied with each instrument shipped from
Ludlum Measurements.
Recalibration should be accomplished after maintenance or adjustments have
been performed on the instrument. Recalibration is not normally required
following instrument cleaning or battery replacement. Recalibration does not
require any special tools or software to perform.
Ludlum Measurements offers a full-service repair and calibration department.
Not only do we repair and calibrate our own instruments, we also service most
other manufacturers’ instruments. Calibration procedures are available upon
request for customers who choose to calibrate their own instruments.
Note:
Ludlum Measurements, Inc. recommends recalibration at intervals
no greater than one year, assuming that regular operational checks
are performed. Check the appropriate local, state, and federal
regulations to determine required recalibration intervals.
Ludlum Measurements, Inc. Page 4-1 December 2016
Model 26-2 Frisker User’s Manual Section 4
Entering Setup Mode
To enter setup mode, power down the Model 26-2, then turn the unit back ON.
When “0.0 cps” (or “0 cpm”) appears on the LCD, press the MODE button
three times (within four seconds) to enter Setup mode. The greed LED will
remain off during the four-second window for entry to Setup mode, and will
resume normal operation when the window has closed. Entry to Setup mode
can be confirmed when the numeric portion of the display is off and only the
rate units (either cps or cpm) are displayed. If you simply wish to view the
parameters, you may do so by not pressing any other buttons. The parameters
will change every four seconds when no buttons are pressed. The unit will
return automatically to normal mode after the last parameter is presented.
SETUP PROTECT: The Model 26-2 parameters can be protected from
unauthorized changes via the internal switch located on the Model 26-2 circuit
board. To change the switch, open the battery compartment and remove the
batteries from the Model 26-2. Next, loosen the four captive Phillips head
screws, which fasten the detector cover.
Now turn the Model 26-2 over so that the detector is facing up. Gently remove
the plastic case that covers the back of the instrument, paying careful attention
not to lose the protective screen that covers the detector itself. Remove the
protective screen, and gently lift the GM pancake detector and set it to the side.
The DIP (dual inline position) switch should now be visible below the detector
retainer.
To protect the Model 26-2 from changes in Setup mode, slide DIP Switch 2
(closest to the battery compartment) to the ON (right) position. If DIP Switch 2
is in the OFF (left) position, changes are allowed in Setup mode. Once the DIP
Switch is set as desired, gently replace the detector in the detector retainer. Place
the detector screen over the detector, and fit the plastic case on the back of the
instrument. Turn the instrument over and tighten the four Phillips head screws.
Install the batteries, and replace the battery cover. Note that with the DIP
Switch 2 in the ON position, Setup mode may be entered and parameters
viewed, but changes cannot be made.
DISPLAY BACKLIGHT ‘Continuous On’: The Model 26-2 display
backlight can be set to remain on continuously during operation. Follow the
steps above for SETUP PROTECT, but use DIP Switch 1 for display
backlight selection. Setting DIP Switch 1 to the ON (right) position will
configure the display backlight to remain on during operation. Set DIP Switch 1
to the OFF (left) position, and the display will be backlit only when light levels
are low.
NOTE: Setting the display backlight for continuous-on operation can result in
reduced battery life.
Ludlum Measurements, Inc. Page 4-2 December 2016
Model 26-2 Frisker User’s Manual Section 4
Setup Parameter
Default Value
Notes
Count Rate Units
cpm
Counts per minute
Response Time
0
Enable Auto Response
Auto-Response Rate
F
Fast Auto Response
Count Rate Alarm Point 1
0
Disabled
Count Rate Alarm Point 2
0
Disabled
Count Rate Alarm Point 3
0
Disabled
Frisk Time
3:00
Three Minutes
Operational Modes
0
All Modes Available
Low Light Threshold
55
Default Setup Values
Setup Mode Operation
Once the Model 26-2 is in Setup mode, the count rate units will be displayed on
the LCD, and the units will be blinking, indicating it as the selected item. Use
the MODE button to adjust the value for the selected item. When the
appropriate value is selected for that item, press the ON/ACK button to move
to the next item. When the desired value is displayed, simply wait for four
seconds. The Model 26-2 will then switch to the next parameter. When SETUP
is in PROTECT mode, the Setup parameters will cycle through to display the
set values, but changes are not possible.
The order of Setup parameters for the Model 26-2 is as follows:
Count Rate Units (Default cpm) - Use MODE to select cps or cpm.
Response Time (Default 0) – Use ON/ACK to select the value to be
adjusted and MODE to adjust the value. Setting Response Time to 0 will enable
Auto-Response mode for the Model 26-2. Available values are:
Ones Place (0-9)
Tens Place (0-6, 6 forces max Response Time of 60)
Ludlum Measurements, Inc. Page 4-3 December 2016
Model 26-2 Frisker User’s Manual Section 4
Count Rate
Auto Response
Time – Fast
(Seconds)
Auto Response
Time – Slow
(Seconds)
Less than 3 kcpm (50 cps)
5
10
Between 3 kcpm and 4 kcpm (67 cps)
4
8
Between 4 kcpm and 6 kcpm (100 cps)
3
6
Between 6 kcpm and 12 kcpm (200 cps)
2
4
More than 12 kcpm
1
2
Auto-Response Rate (Default F) - Use MODE to select Fast (F) or Slow (S).
When operating in Auto-Response mode, the Model 26-2 will vary the
Response Time based on the Auto-Response Rate selected (Fast or Slow) and
the current Count Rate. The Auto-Response Rate selection is:
The Model 26-2 also utilizes a Step function in Auto Response mode, which
enables faster response to a significant increase or decrease in Count Rate.
When the instrument detects a sudden change in count rate from the detector,
the response time is reduced to 1 second to quickly show the new value.
Count Rate Alarm Point 1 (Default 0)
Count Rate Alarm Point 2 (Default 0)
Count Rate Alarm Point 3 (Default 0) - Use ON/ACK to select
the value to adjust, and MODE to adjust the value. All Count Rate Alarm Point
units will be the same as selected earlier with Count Rate Units. Setting a Count
Rate Alarm Point to 0 disables that Alarm Point. Red LEDs will light as
indicated above to distinguish which Alarm Point is being shown. Available
values are:
Ones Place (0-9)
Tens Place (0-9)
Hundreds Place (0-9)
Thousands Place (1 on or off)
Number of Decimal Places (0, 1, or 2– only available if k selected)
Range (k on or off )
Ludlum Measurements, Inc. Page 4-4 December 2016
Model 26-2 Frisker User’s Manual Section 4
Frisk Time (Default 3 minutes) - Use ON/ACK to select the value to adjust,
and MODE to adjust the value. Setting Frisk Time to 0 enables continuous
count until reset. If 19 minutes are selected, then the maximum seconds value is
60; otherwise, the maximum seconds value is 59. Available values are:
Ones Place (0-9)
Tens Place (0-6, 6 only available if minutes value is 19)
Hundreds Place (0-9)
Thousands Place (1 on or off)
Operational Modes (Default 0) - Use MODE to adjust the value. Available
values are:
0 – RATE, MAX, and TIMED FRISK Modes
1 – RATE and MAX Modes
2 – RATE and TIMED FRISK Modes
3 – MAX and TIMED FRISK Modes
4 – RATE Mode Only
5 – MAX Mode Only
6 – TIMED FRISK Mode Only
Low Light Threshold (Default 55) - Use ON/ACK to select the value to
adjust, and MODE to adjust the value. Available values are:
Ones Place (0-9)
Tens Place (0-9)
Hundreds Place (0-9)
NOTE: If no buttons are pressed for four seconds, the Model 26-2 will switch
to the next parameter, and if on the last parameter, will save the parameters and
exit Setup mode, returning to RATE mode operation.
Ludlum Measurements, Inc. Page 4-5 December 2016
Model 26-2 Frisker User’s Manual Section 5
Section
5
Safety Considerations
Environmental Conditions for Normal Use
Indoor or outdoor use (While rain resistant, user is cautioned to avoid
getting water through detector opening.)
No maximum altitude
Temperature range of -40 to 65 °C (-40 to 150 °F)
Maximum relative humidity of less than 95% (non-condensing)
Pollution Degree 3 (as defined by IEC 664): (Occurs when conductive
pollution or dry nonconductive pollution becomes conductive due to
condensation. This is typical of industrial or construction sites.)
Not certified for use in an explosive atmosphere
Warning Markings and Symbols
Caution!
The operator or responsible body is cautioned that the
protection provided by the equipment may be impaired if the
equipment is used in a manner not specified by Ludlum
Measurements, Inc.
The Model 26-2 Frisker is marked with the following symbols:
CAUTION (per ISO 3864, No. B.3.1): designates hazardous live voltage
and risk of electric shock. During normal use, internal components are
hazardous live. This instrument must be isolated or disconnected from the
hazardous live voltage before accessing the internal components. This
symbol appears on the side panel. Be sure to take the precautions noted in
the next section whenever necessary.
Ludlum Measurements, Inc. Page 5-1 December 2016
Model 26-2 Frisker User’s Manual Section 5
The “crossed-out wheelie bin” symbol notifies the consumer that the
product is not to be mixed with unsorted municipal waste when discarding.
Each material must be separated. The symbol is placed on the label located
on the side panel. See section 7, “Recycling,” for further information.
The “CE” mark is used to identify this instrument as being acceptable for
use within the European Union.
Cleaning and Maintenance Precautions
The Model 26-2 may be cleaned externally with a damp cloth, using only
water as the wetting agent. Observe the following precautions when
cleaning or performing maintenance on the instrument:
1. Turn the instrument OFF and remove the batteries.
2. Allow the instrument to sit for one minute before cleaning the
exterior or accessing any internal components for maintenance.
Ludlum Measurements, Inc. Page 5-2 December 2016
Model 26-2 Frisker User’s Manual Section 6
Section
6
Revision History
NOTE: This section of the manual will be updated with each revision of the Model
26-2 in order to document changes over time. Ludlum Measurements’ policy is to
provide free software upgrades to instruments for the life of the instrument.
December 2016: Added Linearity to Specification, Section 3.
October 2016: Added Low Light Threshold to page 4-5 above the bottom
note.
August 2016: Added description of headphone option in Introduction, page 1-
1. Added information about Instrument Return Form to page 2-1.
March 2014: Added Window Protect Screen and updated Window Area in
Specifications section page 3-1.
December 2013: Corrected battery reference to AA. Deleted Surface
Emissions Rate in Specs.
November 2013: Added Battery Installation procedure and photos on page 2-
2.
February 2013: Changed NORMAL mode to RATE mode throughout
manual. Added operational descriptions for RATE, MAX, and TIMED
FRISK modes to Section 2. Corrected non-latching/latching alarm wording
(Page 1-1). Corrected instructions for battery lid removal in Section 2 Battery
Installation (Page 2-1). Corrected Scaler Time to Frisk Time (Page 4-5).
January 2013: New manual.
Ludlum Measurements, Inc. Page 6-1 December 2016
Model 26-2 Frisker User’s Manual Section 7
Section
7
Recycling
Ludlum Measurements, Inc. supports the recycling of the electronics
products it produces for the purpose of protecting the environment and to
comply with all regional, national, and international agencies that promote
economically and environmentally sustainable recycling systems. To this end,
Ludlum Measurements, Inc. strives to supply the consumer of its goods with
information regarding reuse and recycling of the many different types of
materials used in its products. With many different agencies – public and
private – involved in this pursuit, it becomes evident that a myriad of
methods can be used in the process of recycling. Therefore, Ludlum
Measurements, Inc. does not suggest one particular method over another, but
simply desires to inform its consumers of the range of recyclable materials
present in its products, so that the user will have flexibility in following all
local and federal laws.
The following types of recyclable materials are present in Ludlum
Measurements, Inc. electronics products, and should be recycled separately.
The list is not all-inclusive, nor does it suggest that all materials are present in
each piece of equipment:
Batteries Glass Aluminum and Stainless Steel
Circuit Boards Plastics Liquid Crystal Display (LCD)
Ludlum Measurements, Inc. products that have been placed on the market
after August 13, 2005, have been labeled with a symbol recognized
internationally as the “crossed-out wheelie bin,” which notifies the consumer
that the product is not to be mixed with unsorted municipal waste when
discarding. Each material must be separated. On the Model 26-2, the symbol
will be placed on the serial number label located on the side of the
instrument.
The symbol appears as such:
Ludlum Measurements, Inc. Page 7-1 December 2016
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