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Model 35

Vehicle-Mounted Digital Survey Meter

Part Number: 48-4112

Features

Includes Rotatable Ball-Mount Stand
Optional Windshield and Under-Dash Mounts Available
Powered by Connected Vehicle or Internal Batteries
Large Backlit Auto Ranging LCD with Adjustable Viewing Angle
Simple Green, Yellow, and Red Status Lights
3-Button Intuitive Interface for Easy Operation
USB Port and All-Digital Calibration

The Ludlum Model 35 is a versatile, lightweight, vehicle mounted instrument with an external detector used for alpha, beta, or gamma radiation survey. It remains unobtrusive until an alarm is reached. At that point the monitor can be quickly removed from the mount for closer inspection. Three modes of operation – RATE, MAX, and COUNT – are available for the user. Measurements can be collected in two sets of units (primary and secondary) for RATE and MAX modes in cps, cpm, Bq, dpm, R/hr, rem, or Sv/h units. The user can switch between two sets of chosen units by simply pressing the Units button.

An internal switch is used to enable or disable the front-panel setup feature to protect desired settings from inadvertent modification. Setup is also available via software available from Ludlum Measurements.

This instrument features a large, easily-readable LCD (liquid crystal display), an audio warning tone, and easy, intuitive, user-friendly design. Splash-resistant construction allows the Model 35 to be used outdoors. The instrument body is made of lightweight, durable, high-impact plastic. The Model 35 is shipped ready to use with batteries and calibration certificate.

Specifications

Compatible Detectors	GM, Proportional, Scintillation (default BNC connector - others available)
LCD Display	3 digit LCD with large 13.4 mm (0.53 in.) digits, low-battery indicator, MAX, ALARM, MUTE Units: (k)cps, (k)cpm, (k)Bq, (k)dpm, (µ)(m)R(/h), (µ)(m)Sv(/h), (µ)(m)rem(/h)
Display Range	0.0 cps to 99.9 kcps 0.00 cpm to 999 kcpm 0.00 Bq to 99.9 kBq 0.00 dpm to 999 kdpm 0.00 µR/h to 999 R/h 0.00 µrem/hr to 999 rem/h 0.00 µSv/h to 999 Sv/h Display range can be set to limit display to calibrated range
Backlight	Built-in ambient light sensor automatically activates low-power LED backlight, unless internal dipswitch is set to continuous-on (will reduce battery life). Alarm light intensity varies based on ambient light levels.
Controls	ON/OFF/ACK: Long press to turn ON; Tap to acknowledge alarms and silence alarm tone; Press to reset Sigma Audio alarm, turn “click” audio On/Off, turn Sigma Audio beep On/Off; Press and hold for OFF UNITS: Long press changes the units between count rate (cpm, cps), dose/exposure (Sv/h, mR/hr, rem/hr), or disintegration (dpm, Bq) MODE: Long press alternates between NORMAL (count rate), MAX (captures peak rate), and COUNT (user-selectable preset count time from 0 to 10 min). Number of modes can be reduced in setup.
Response Time	User-selectable from 1 to 60 seconds, auto-response rate FAST or SLOW, or Fixed FAST and SLOW
Alarms	Count rate, Exposure/dose, and Scaler alarm setpoints adjustable over the display range
Overload	High count rate saturation protection prevents false display of lower count rates
Zero Protection	After a user-settable time interval (default 60 seconds) of no pulses from the detector, the instrument will flash zero reading and the alarm audio will be triggered
Dead Time Correction	Employs first and second order corrections for extended performance
High Voltage	400 to 1500 Vdc
Threshold	2 to 120 mV
Audio	Greater than 75 dB at 0.6 (2 ft), approximately 4 kHz
Click Audio Divide	x1, x10, x100, x1k
Power	Internal: Two alkaline or two rechargeable “AAA” batteries External: 10 to 24 V through optional powered mount
Battery Life	100 hours, 24 hr low battery warning
Construction	High-impact plastic with water-resistant rubber seals and separate battery compartment
Temperature Range	-20 to 50 °C (-5 to 122 °F) May be certified for operation from -40 to 65 °C (-40 to 150 °F)
Environmental Rating	NEMA rating of 3x or IP rating of 52 with Audio Hole Seal option (hole seal option will reduce maximum volume by approximately 10 dB)
Size (H x W x L)	8.5 x 8.0 x 4.8 cm (3.4 x 3.1 x 1.9 in.)
Weight	174 g (0.38 lb)

Options

Option	Description	Part Number
Lumic Calibration Kit	Lumic Calibration Software allows the reading and writing of important parameters via a USB port in the Model 3000 Series and Model 30 family of instruments. This software also includes a calibration wizard (guides the user through calibration steps) and a plateau wizard (determines the optimal detector operating voltage). The kit includes Lumic Calibration Software versions 1.0 and 2.0, a Model 3000 Series USB cable, and a Model 30 family USB cable.	4519-865
Lumic Configuration Kit	Lumic Configuration Software allows the reading and writing of important parameters via a USB port in the Model 3000 Series and Model 30 family of instruments. Does not include calibration or plateau wizards. The kit includes the Lumic Configuration Software, a Model 3000 Series USB cable, and a Model 30 family USB cable.	4519-747
Audio Hole Seal Option	Reduces audio volume output.	4498-913
Windshield Mount	Mounts instrument to vehicle windshield.	4498-682
Under-Dash Mount	Mounts instrument underneath vehicle dashboard.	4498-681

Firmware Updates

In order to use the latest Lumic Calibration Software*, you may need to update the firmware on your instrument. (All new instruments will be compatible with the latest software version.) Use the table below to determine the firmware requirement for your instrument.

Software Version	Compatible Models	Required Firmware
Lumic 1.0	30, 30-4, 30-6, 30-7, 35, 79	2.x or lower
	3000, 3001, 3005, 3006, 3019, 3276	N34 or lower
	3002, 3277	N12 or lower
Lumic 2.0	30, 30-4, 30-6, 30-7, 35, 79	3.x or higher
	3000, 3001, 3005, 3006, 3019, 3276	N40 or higher
	3002	N20 or higher
	3003, 3014, 3078	N/A

*Note: If you purchased the original Lumic 1.0 software, you are eligible for a free copy of Lumic 2.0. Please contact your local sales representative or Ludlum Measurements to receive your copy.

To update the firmware on your instrument:

Download the appropriate instructions file (PDF) for your instrument.
IMPORTANT: The firmware update instructions are model number specific. You must use the instructions for your specific instrument model. See table below.

Model	Instructions File
30, 30-4, 30-6, 30-7, 35, 79	Lumic Firmware Update Instructions (Model 30/35/79 Series)
3000, 3001, 3002, 3005, 3006, 3019, 3276	Lumic Firmware Update Instructions (Model 3000 Series, Gen 1)
3003, 3014, 3078	Lumic Firmware Update Instructions (Model 3000 Series, Gen 2)

Download the latest Lumic Firmware Updater Software.
Determine the printed circuit board number your instrument has. To do this, you must open the instrument can and find the number on the circuit board.
Using the drop-down selectors below, select your instrument model and printed circuit board number. This will populate a list of available firmware downloads for your instrument.