We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Square boiler gauge with steel case and glass lens, bottom 1/2 MNPT connection, dual PSI and Fahrenheit scales

Value Brand

Value Brand Square Boiler Gauge 0-75 PSI 60-260 F

SKU CH-A763-B5NDW

Measures boiler pressure up to 75 PSI and temperature from 60 to 260 F with a square steel case and bottom 1/2 in MNPT connection

  • Product typeElectronic
  • Accurate pressure monitoring with 0-75 psi range
  • Dual-scale temperature reading from 60 to 260 F
  • Reliable performance backed by +/-3-2-3 percent pressure accuracy
  • Durable construction using steel case and brass wetted parts
  • Clear visibility through glass lens on square dial

Square Boiler Gauge for hydronic systems

This square boiler gauge measures pressure from 0 to 75 psi and temperature from 60 to 260 degrees Fahrenheit. It is intended for technicians and facility managers who monitor hydronic heating equipment. The 1/2 inch MNPT bottom connection fits standard boiler tappings. Copper and brass wetted parts suit typical boiler water chemistry.

Accuracy and environmental notes

Pressure accuracy follows a +/-3-2-3 percent grade across the scale. Temperature accuracy is rated at +/-3 percent of span. The glass lens and steel case protect the mechanism in mechanical rooms. California Proposition 65 warnings apply because the product contains a chemical known to cause cancer and a chemical known to cause birth defects or other reproductive harm.

Installation requirements and clearances

The case measures 3 11/16 inches in both height and width, so the mounting opening must accommodate those dimensions. A 1/2 inch MNPT fitting and appropriate thread sealant are needed to complete the connection. The bottom entry orientation keeps the gauge readable above the piping. No external power is required for operation.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $24.99
Cheaper than about 71% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameZORO SELECT
Product typeElectronic

Questions about this item

How do I install the gauge with its 1/2 in MNPT bottom connection without stripping the threads?

Apply PTFE tape to the male NPT threads, thread the gauge by hand until snug, then tighten one to two turns with a wrench on the steel case flats; do not overtighten or the glass lens can crack.

Which component will need replacement first under normal boiler cycling?

The brass/bronze wetted parts and copper sensing element are subject to corrosion and fatigue from repeated 60 to 260 F cycles, so the Bourdon tube or sensor assembly typically fails before the steel case or glass lens.

At what pressure will the +/-3-2-3 % accuracy band be exceeded during sustained operation?

The gauge is rated 0 to 75 psi; sustained pressure near the 75 psi upper limit combined with temperatures approaching 260 F will push the reading outside the stated accuracy band first.

More in Meters, Testers & Measuring Tools

Similar items