IAS-TA20 Rack-Mount Tritium Air Monitor — Gamma Compensated, 19-inch 5U
A continuous area monitor for fixed tritium sampling points. It uses four wire-wall ionization chambers (two measuring, two for gamma compensation), switches range automatically and reports over Ethernet (Modbus/TCP) to your control system.
Quick answer
IAS-TA20 is a fixed area monitor (19-inch rack) in the IAS-T tritium monitoring series from Iodine Air Systems. It measures tritium from 3.7 × 10⁴ to 3.7 × 10¹¹ Bq/m³ (1 µCi/m³ to 10 Ci/m³). US 120 V / 60 Hz version; calibration certificate and certificate of conformance included; price on quotation.
What the IAS-TA20 does
The IAS-TA20 is built for long-term, unattended monitoring at a fixed sampling point: a tritium laboratory, a fuel-cycle room, a reactor building area at a heavy-water plant or a fusion hall. Sample air is pumped through two 1 L flow-through wire-wall ionization chambers. Two further chambers compensate for gamma background.
Wire-wall chamber designs generally expose less solid wall surface to the sample than conventional chambers, which helps limit tritium adsorption and "memory" of a past high reading. The electronics switch range automatically across seven decades and suppress zero drift, so readings stay stable over long unattended runs.
The instrument fits a standard 19-inch rack (5U) and reports over Ethernet using Modbus/TCP, so it can sit in a monitoring rack and feed the plant computer, a PLC or a SCADA historian.
Key features
- Four wire-wall ionization chambers: 2 flow-through measuring + 2 gamma compensation
- Automatic range switching across 3.7 × 10⁴ – 3.7 × 10¹¹ Bq/m³
- Zero-drift self-suppression for long unattended operation
- Adjustable sample flow 1–9 L/min
- Local audible and visual alarm
- Ethernet, Modbus/TCP for remote reading and control
- 6 × 4 mm quick-connect screw sample fittings
- Mounts in a standard 19-inch cabinet (5U) using the front-panel holes
IAS-TA20 specifications
| Detectors | 4 wire-wall ionization chambers: 2 flow-through measuring, 2 gamma compensation |
| Measuring volume | 2 × 1 L |
| Range (SI) | 3.7 × 10⁴ to 3.7 × 10¹¹ Bq/m³ |
| Range (US units) | 1 µCi/m³ to 10 Ci/m³ (10⁻⁶ to 10 µCi/mL) |
| Range as HTO DAC multiples | 0.05 DAC to 500,000 DAC (HTO DAC 2E-5 µCi/mL) |
| Range switching | Automatic |
| Sample flow | 1–9 L/min (0.035–0.32 cfm) |
| Alarm | Audible and visual |
| Communication | Ethernet, Modbus/TCP |
| Sample connections | 6 × 4 mm quick-connect screw fittings (6 mm OD / 4 mm ID tube) |
| Power | 120 V AC / 60 Hz (US version); 220–230 V / 50 Hz export version; < 100 W |
| Operating environment | 5–40 °C (41–104 °F); 40–90% RH; atmospheric pressure |
| Dimensions | 490 D × 485 W × 240 H mm (19.3 × 19.1 × 9.4 in) |
| Mounting | 19-inch rack, 5U |
Specifications are nominal manufacturer values and may change. Confirmed values are stated on the quotation and data sheet. DAC multiples use the tritiated-water DAC of 2 × 10⁻⁵ µCi/mL (7.4 × 10⁵ Bq/m³) from 10 CFR 20 Appendix B and 10 CFR 835 Appendix A.
Typical applications
- Continuous room air monitoring in tritium handling laboratories
- Heavy-water (CANDU / PHWR) reactor building areas and upgraders
- Fusion facility tritium plant rooms and experimental halls
- Tritium storage and fuel-cycle rooms at DOE and national laboratories
- Monitoring racks that feed a control-room alarm panel
US supply, documentation and quality
Iodine Air Systems supplies the IAS-T series as an authorized distributor. Instruments are built by our manufacturing partner to our US configuration. Each quotation states the exact deliverables, lead time and country of origin.
- US power version: 120 V AC / 60 Hz for mains-powered models (export versions for 220–230 V / 50 Hz).
- Factory calibration certificate with every instrument, stating the calibration method and reference standards.
- Certificate of conformance and product certification documents supplied with the quotation.
- Specifications in SI and US units, with ranges stated in µCi/mL and in multiples of the tritium DAC (10 CFR 20 Appendix B / 10 CFR 835 Appendix A), so they drop straight into your procedures.
- Commercial-grade supply. Instruments are supplied as commercial-grade items, not as 10 CFR 50 Appendix B / NQA-1 safety-related items. For safety-related use, we support the purchaser's commercial-grade dedication with critical-characteristic data and test records.
- Price on quotation. Price depends on model, options, quantity, documentation package and destination.
Compare with related IAS-T models
Floor-Standing Tritium Air Monitor
Fixed area monitor (cabinet)
View IAS-TA30 →IAS-TG30Glovebox & Process Tritium Monitor
Process monitor (sealed, all-metal)
View IAS-TG30 →IAS-TS40HT / HTO Tritium Speciation Monitoring System
Multi-form (HT/HTO) monitoring system
View IAS-TS40 →See the full IAS-T tritium monitor range or use the tritium DAC converter to check a reading against your limits.
IAS-TA20 FAQ
What is the difference between the IAS-TA20 and the IAS-TA30?
Both are fixed tritium air monitors with the same range. The IAS-TA20 is a 19-inch rack unit with gamma compensation chambers. The IAS-TA30 is a floor-standing cabinet with a local touchscreen and flow alarm. In areas with a significant gamma background, choose the gamma-compensated IAS-TA20.
Can the IAS-TA20 connect to our plant computer or PLC?
Yes. It has an Ethernet port using Modbus/TCP for remote reading and control. Ask us for the register list when you request a quote.
Why wire-wall ionization chambers?
Tritium adsorbs on chamber walls and can leave a residual reading after exposure to high concentrations (the memory effect). Wire-wall chambers present much less solid surface to the sample, which helps limit memory and speeds recovery.
What sample flow should I use?
The instrument accepts 1–9 L/min. Higher flow gives faster response at the end of a long sample line; about 2 L/min is a common starting point. Keep sample lines short, because tritiated water vapor adsorbs on tubing.
How much does the IAS-TA20 cost?
The IAS-TA20 is priced on quotation. The price depends on options, quantity, power version, documentation package and delivery destination. Send the quote form on this page or email sales@iodineairsystems.com, and we reply with price, lead time and the list of documents supplied.
Is the IAS-TA20 available for US 120 V power?
Yes. Mains-powered IAS-T models are available in a 120 V AC / 60 Hz US version, and in 220–230 V / 50 Hz for export.
What documents come with the IAS-TA20?
A factory calibration certificate, a certificate of conformance, product certification documents and an English operating manual. A commercial-grade dedication support package is available for purchasers who dedicate the instrument for safety-related use.
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