The Model 421 features a wide measurement range of up to 6.5 decades with dual or quad ionization chambers for gamma compensation. Useful for accurately measuring low levels of tritium across a wide range, even in areas with an elevated gamma background. The Model 421 is part of our modular series, designed for easy customization, and features an upgraded alarm system that includes two adjustable tritium level alarms (alert level and high level) with audible and visual alarm indicators, acknowledge (mute), latching, or non-latching alarm modes, and up to three alarm relays (two-level relays and one malfunction relay). Optional alarm indicators include: low flow alarm and malfunction alarm (low voltage failure, high voltage failure, or electrometer failure).
The Model 421 typically supports two different chamber sizes, depending on your range and sensitivity requirements, select either dual 2L chambers or quad 2L chambers. Quad 2L ionization chamber assembly arranged in a cruciform geometry provides the best sensitivity, stability, and omnidirectional gamma compensation. Ionization chambers can be mounted remotely (up to 25 feet standard), or locally inside the electronics enclosure.
Typical Measurement Ranges:
|Dual 2L:||1 to 199,999 µCi/m3||0.01 to 1,999.9 MBq/m3|
|Quad 2L:||0.1 to 19,999 µCi/m3||0.01 to 1,999.9 MBq/m3|
A wide variety of options are available, including: choice of data outputs (RS-232, Ethernet, 4-20mA), pump type and flowmeter assembly, system failure monitor, low flow alarm, remote display unit, helium leak testing, wire-grid ion chambers, gold-plated measurement chamber, HTO only measurement (noble gas compensation), and more.
|RANGES||Available in the following ranges:|
Note: Additional or wider ranges and configurations may be available.
|DISPLAY||4 ½ digit panel meter (standard digital display)|
|ACCURACY||±10 % of reading|
|ALARM SYSTEM||-two independent level alarms, with adjustable set point via 3-digit thumb-switch|
mode: three position toggle switch selector for latching or non-latching modes and reset
indicators: alarm condition activates a visual red LED flashing indicator, acoustic indicator, and failsafe relay closure
mute: acknowledge push button to silence acoustic indicator after alarm is tripped
includes up to 3 alarm relays: two level alarm relays and one malfunction alarm relay
OPTIONAL alarms include: low flow alarm and system failure alarm (high and low voltage failure, electrometer failure)
|OFFSET COMPENSATION||compensation control provided to offset the effects of gamma and/or tritium buildup|
|ENVIRONMENTAL||storage: -40° C to +60° C|
operating: 0° C to +50° C
0 to 95 % R.H. non-condensing
|ENCLOSURE||5.25” H x 17” W x 13” D, 15 lbs.|
115-220VAC, 50/60 Hz