Waltron 9131C Sodium Analyzer

Ultra-compact online sodium analyzer for ultrapure water with color touchscreen, internal temperature compensation, and dual isolated 4–20 mA outputs.

Key advantages

Wide sodium range — 0.10 ppb…10 ppm (display 0.01 ppb…10 ppm).
±5% of reading or ±0.1 ppb — whichever is greater, within ±5 °C of calibration temperature.
Dual 4–20 mA + Modbus — RS-232 & RS-485 Modbus RTU; three voltage-free alarm contacts.
Compact panel/wall package — 40×30×20 cm; ~9 kg; color touchscreen and internal datalogger with USB.

Typical applications

Make-up water, condensate, boiler feedwater, and steam sodium monitoring.
Ultrapure water loops needing low-ppb sodium with manual calibration assist.
Single-channel installs using ammonium hydroxide or DIPA buffers.

Selection guide

Range / accuracy — 0.10 ppb…10 ppm; ±5% of reading or ±0.1 ppb (whichever greater) within ±5 °C of cal temperature.
Response — ~90% of 1–10 ppb step <4 min; 90% of 100–1 ppb step ~5 min.
Outputs — Two isolated 4–20 mA; RS-232 & RS-485 Modbus RTU; three alarm contacts (2 A / 250 VAC non-inductive).
Power — 90…250 VAC.
Sample — 5…55 °C; 150…400 ml/min; 5…30 psig (0.35…2.07 bar); filtered to 60 μm; free of film-forming compounds.
Ambient — 0…55 °C.
Mounting — Panel / wall; sample ¼ in. OD Swagelok.
Buffer — Ammonium hydroxide or DIPA.
Calibration — Manual with menu assist; internal temperature compensation.

Common mistakes

Feeding unfiltered or film-forming samples — OEM asks for 60 μm filtration and clean chemistry.
Expecting multi-stream without confirming single-channel scope.
Ignoring sample pressure/flow window (5…30 psig / 150…400 ml/min).
Ordering without stating buffer preference (ammonium hydroxide vs DIPA).
Analytical / water quality · Liquid analysis buying guide

When to RFQ / what to tell us

Expected sodium range (ppb/ppm) and sample temperature/pressure/flow.
Buffer preference; alarm/analog scaling needs.
Mounting (panel/wall), power region, quantity, ship-to country.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	174214
Brand	Waltron
Model	9131C
Product type	sodium analyzer
Measuring range	0.10 ppb to 10 ppm (displays 0.01 ppb to 10 ppm)
Accuracy	±5% of reading or ±0.1 ppb (whichever greater) within ±5 °C of calibration temperature
Output signal	Two isolated 4–20 mA; RS-232 & RS-485 Modbus RTU; three voltage-free alarms
Supply voltage	90 to 250 VAC
Process connection	0.635 cm (1/4 in.) OD Swagelok sample
Ambient temperature	0 to 55 °C (32 to 131 °F)
Sample temperature	5 to 55 °C (40 to 130 °F)
Weight	9 kg (20 lb)
Dimensions	40 × 30 × 20 cm (16 × 12 × 8 in.)
Notes	Specs from waltron.net 9131C product page. Single-channel. Reagents/electrodes are consumables.

Documents

Waltron 9131C product sheet (PDF)

FAQ

Q: What sodium range does the 9131C cover? A: Analysis 0.10 ppb…10 ppm (display down to 0.01 ppb). Confirm your expected ppb band in the RFQ.

Q: Multi-stream? A: Published as single-channel. Ask if you need multi-stream options in the family.

Q: What should I send for a quote? A: Range, sample T/P/flow, buffer, mounting, power, quantity. Compatible with systems using Waltron 9131C if you need a drop-in check — we do not claim authorized-dealer status.