ATi / GasSens — Gas Detection & Hydrogen-Peroxide Monitors

The target gas sets the detection chemistry. Electrochemical sensors are the default for toxic gases — chlorine, ammonia, hydrogen sulfide, ozone, and roughly thirty others from parts-per-billion to percent levels — because they are specific and sensitive at low concentration. Catalytic-bead sensors (the C12-17) read combustible gases as a percentage of the lower explosive limit: methane, propane, hydrogen, and solvent vapors from 0 to 100% LEL. Infrared (NDIR) sensors (the D12Ex-IR and the E12-15 ammonia detector) measure combustibles, carbon dioxide, and high-level ammonia by light absorption, so they cannot be poisoned, do not need oxygen to work, and fail safe. The rule of thumb: electrochemical for toxics, catalytic for routine combustible-LEL monitoring, and infrared where the gas would poison a catalytic bead, where oxygen is absent, or where drift-free long life matters. Tell us the gas, its range, and the background atmosphere and the right sensor is matched to it.

Every current ATi transmitter — the D12, D16, F12, and the modular system — uses the H-Series smart sensor: the sensing cell, its amplifier, and a calibration memory in one plug-in module. Calibration data lives in the sensor, not the transmitter, so a freshly calibrated sensor swaps into a live transmitter in the field with no recalibration and no downtime — you keep a spare calibrated module on the shelf and exchange it on a schedule. The same transmitter can also be re-tasked to a different gas just by fitting a different H-Series sensor. It is the single biggest reason the maintenance burden on an ATi system stays low.

Fixed transmitters (the B12, C12-17, D12, E12, and F12 families) mount permanently at a known leak or exposure point and wire back to a controller or alarm for continuous area and safety monitoring. The D16 PortaSens III is the portable: a hand-held detector with an internal pump and sampling wand that accepts more than sixty plug-in H-Series sensors, used for leak surveys, confined-space checks, spot verification, and tracking down the source a fixed unit flagged. Most plants run both — fixed coverage at the fixed hazards, a PortaSens III for everything that moves — and because both share the H-Series sensor, the portable can carry the same calibrated sensor types as the fixed network.

Yes. The D12 is explosion-proof for installation in classified areas, and the F12 family covers both schemes: the F12iS is intrinsically safe and loop-powered (12-28 VDC) for the lowest-energy approach, and the F12/D is the line-powered version with its own display and datalogger. The C12-17 combustible transmitter carries an explosion-proof 316 stainless sensor. Intrinsic safety depends on the right barrier and wiring on your side, so tell us the area classification (Class, Division or Zone, and gas group) and the protection method you prefer and the transmitter, sensor holder, and documentation are specified to suit.

Match the controller to how many points you have and how far they sit. The B14 is the simple end: a compact alarm receiver that takes a 2-, 3-, or 4-wire 4-20 mA transmitter up to 10,000 feet away, shows the reading, and drives alarm setpoints and a retransmit output — right for one or a few points. The A14/A11 modular system distributes display, isolated analog-output, four-relay, and power-supply modules on a backplane, with sensors up to 1,000 feet from the receiver — right for a mid-size multi-point installation that needs relays and analog outputs per channel. The GasSens Midi is the networked controller: up to 64 addressable sensors over a single four-core CANbus cable, networkable to 1,024 points across sixteen units, with Modbus RS-485, three alarm levels, and an event log — right for a large or plant-wide system. Tell us the point count, the distances, and whether you need Modbus and we size the controller.

Two accessories handle difficult sampling. The A21 gas sampler is a diaphragm sample-draw pump that pulls a sample from a duct or a remote point to the sensor and alarms on loss of flow — used when the gas will not come to the sensor on its own. The C21 Dri-Gas adds water-vapor removal: a cold plate dehumidifies the sample before it reaches the sensor, which stops the "blinding" that condensing or saturated streams cause on an electrochemical cell. For a permanently wet stream — a wet-scrubber outlet or chlorine storage — the B12 Wet transmitter instead uses corrosion-resistant sensors rated for 100% relative humidity. Tell us the stream temperature, humidity, and distance and the sampling train is built around it.

Electrochemical and catalytic sensors are calibrated against a known gas concentration on a schedule. The H-Series smart sensor turns that into a module swap rather than a field procedure: because the calibration data lives in the sensor module, a freshly calibrated sensor exchanges into a live transmitter in the field with no recalibration and no downtime — you keep a spare calibrated module on the shelf and rotate it on a schedule. Tell us the gases you monitor and your calibration approach and we include the right calibration gas and a sensor-exchange plan.

The IsoMon is the dedicated instrument for that. It is a dual-channel hydrogen-peroxide (H2O2) vapor monitor for validating isolator and chamber decontamination cycles — a high-range cell and a low-range cell, solenoid-switched, so one instrument follows the H2O2 concentration from the high vapor charge down to the parts-per-million aeration endpoint that releases the chamber. It is used in pharmaceutical and aseptic-processing isolators where the decontamination cycle has to be proven. Tell us the isolator volume and the cycle endpoints and the monitor and sampling are specified for it.