Pyxis IK-2000 GUARDIAN Boiler Feedwater Analyzer
In Turkey, Mikron Proses supplies the Pyxis IK-2000 GUARDIAN boiler feedwater analyzer series under the Walchem brand for online ppb-level dissolved oxygen and multi-parameter boiler water monitoring. The four-level panel uses identical hardware for every tier, so a plant can start with one sensor and add up to three additional channels later without replacing the enclosure.
Four-level model line-up
The GUARDIAN series is built on a single pre-plumbed stainless-steel panel that accepts four sensor tiers. The table below lists the part numbers and sensor complements for each level.
| Level | Model | Part Number | Sensor complement |
|---|---|---|---|
| 1 | IK-2000 | 47522 | ST-774 dissolved oxygen |
| 2 | IK-2010 | 47744 | ST-774 + ST-765SS-SO3 sulfite / pH / ORP |
| 3 | IK-2020 | 43809 | Above + ST-525SS-T fluorescein |
| 4 | IK-2030 | 48807 | Above + ST-724 conductivity |
Because every tier shares the same panel, a user can purchase a base level and install extra sensors afterward; the panel recognises and configures the new sensor automatically. See also the online analyzers range.
Sensor ranges and accuracy
ST-774 dissolved oxygen (all levels) – Optical fluorescence-quenching sensor with a replaceable front-loading DCC-2 membrane cartridge. Range 0.1–2,000 ppb; accuracy ±0.3 ppb. The 316L stainless steel body and flow cell suit ultra-low DO measurement in boiler feedwater.
ST-765SS-SO3 sulfite + pH + ORP (Level 2 and above) – Sulfite range 0.00–100.00 ppm (±0.01 ppm); pH 0.01–14.00 (±0.01); ORP -1,500…+1,500 mV (±1 mV). Electrode life is 12–24 months depending on water quality.
ST-525SS-T fluorescein (Level 3 and above) – Optical measurement at 470 nm excitation / 520 nm emission. Range 0.00–60.0 ppb; accuracy ±0.2 ppb. The stainless-steel sensor mounts directly in the ST-007 flow cell.
ST-724 conductivity (Level 4 only) – Hastelloy two-electrode cell. Range 0.02–1,000 µS/cm; cell constant (K) 0.3. User-defined TDS conversion is integrated in the panel interface.
Sample conditions and panel data
The manufacturer requires that the sample be drawn from the deaerator storage tank and downstream of a sample cooler; the feed pump outlet is not a suitable tapping point. Keep sample temperature at 4–49 °C, pressure at 7.25–30 psi, and flow at 100–500 mL/min. The panel measures 600×800×335 mm, weighs ~25 kg, and is rated IP-65; sensors carry IP-67.
Display, outputs, and data logging
A 7-inch UC-100AGS colour industrial touchscreen serves as the operator interface. The controller logs data to 4GB of internal memory (~1 million records) and provides six 4–20 mA outputs, RS-485 Modbus-RTU, Modbus-TCP, two 24 VDC relays, and two analog control outputs. A built-in CloudLink 4G gateway with a global SIM card is pre-configured and is activated upon user enrollment (annual enrollment applies).
Applications
The GUARDIAN panel is used for monitoring dissolved oxygen, sulfite, fluorescein, and conductivity from a single enclosure in low- and high-pressure boiler feedwater lines. Conductivity readings from the ST-724 can be fed to an existing blowdown controller to calculate cycles of concentration. The ST-765SS-SO3 channel also helps verify oxygen scavenger dosage.
How Mikron Proses helps
Mikron Proses selects the appropriate GUARDIAN level based on the plant’s chemical treatment program and the number of parameters to be monitored. The team also commissions and services Pyxis products, in line with the Pyxis brand page. For background on boiler water dissolved oxygen and boiler water conductivity, the linked guides cover the application background.
To discuss which IK-2000 tier fits your boiler feedwater monitoring scheme, please use the contact page.
Frequently Asked Questions
Technical answers from Mikron Proses.
Which parameters does the Pyxis IK-2000 GUARDIAN measure?
Depending on the level, the panel combines dissolved oxygen (ST-774: 0.1–2,000 ppb, ±0.3 ppb), sulfite with pH and ORP (ST-765SS-SO3: sulfite 0.00–100.00 ppm, pH 0.01–14.00, ORP -1,500…+1,500 mV), fluorescein tracer (ST-525SS-T: 0.00–60.0 ppb), and conductivity (ST-724: 0.02–1,000 µS/cm). All channels share one UC-100AGS controller and touch display.
What is the difference between IK-2000, IK-2010, IK-2020, and IK-2030?
All four models use the same pre-plumbed panel. IK-2000 includes only the ST-774 DO sensor. IK-2010 adds the ST-765SS-SO3 sulfite/pH/ORP sensor. IK-2020 adds the ST-525SS-T fluorescein sensor. IK-2030 adds the ST-724 conductivity cell. Lower levels can be field-upgraded without replacing the enclosure.
What sample conditions does the GUARDIAN panel require?
The sample must be taken from the deaerator storage tank and downstream of a sample cooler, never directly from the feed pump outlet. The required temperature is 4–49 °C, pressure 7.25–30 psi, and flow 100–500 mL/min.
How is ppb dissolved oxygen calibrated in the field?
The ST-774 sensor uses optical fluorescence quenching with a replaceable front-loading DCC-2 membrane cartridge. Zero calibration in the ppb range is performed on site using the Pyxis Sulfite-ZERO calibration kit.
Can the GUARDIAN analyzer support boiler blowdown control?
Yes. The IK-2030 level includes the ST-724 conductivity cell (0.02–1,000 µS/cm, K=0.3). When this signal is shared with an existing blowdown controller, the plant can calculate cycles of concentration.
Planning a project? Send us your flow rate, feed water source and target water quality to [email protected] — our engineers will reply with a technical proposal.