STD 735

STD 735

What This Data Means — For Quick Client Selection

  • For steam + superheated boilers → rated for high DP & thermal shifts without drift.
  • Custody/critical accuracy class → ±0.04% makes it suitable for billing, ammonia flow, and turbine steam balance.
  • Harsh corrosive lines → choose Hastelloy/Tantalum for HCl, brine, chlorides, high-pH chemicals.
  • Long life, no recalibration headaches → 10-year stability lowers instrument downtime and shutdown planning.
  • Best for DP-derived flow (orifice, venturi, averaging pitot) where repeatability in condensate/HP steam is mandatory.
  • SIL certification → use confidently in shutdown, safety trip, and boiler protection sequences.
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Description

Honeywell STD735 is an advanced DP transmitter for high-precision flow, steam DP, level, and filter monitoring in harsh chemical and power environments. With ultra-stability, ±0.04% accuracy, SIL certification, and dual-stage compensation, it’s ideal for refinery steam lines, ammonia plants, power boilers, HP condensate, and critical DP measurement.

 STD735 — Key Technical Data & Selection Parameters

Parameter Specification / Details
Measurement Type Differential Pressure (Premium accuracy class)
Accuracy ±0.04% of span
Stability 0.01% URL/year (up to 10 years)
DP Ranges 0–0.016 bar to 0–250 bar DP
Turn Down Ratio 150:1 (extended dynamic range)
Output 4–20 mA + HART / Fieldbus / Profibus PA
Response Time ≤ 80 ms fast-settling configurable
Safety Approval SIL2 / SIL3 (Loop-certified IEC61508)
Ingress Rating IP66 / IP67 and NEMA Type 4X
Process Temp –40 °C to +120 °C (with isolating seals)
Process Wetted Parts SS316L / Hastelloy C / Monel / Tantalum
Overpressure Limits Up to 210 bar protection
Diagnostics Plug impulse alert, over-range alarm, sensor drift tracking
Display & Interface Large LCD with backlight + tactile keypad

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