Product Details
The Honeywell 51451326-503, also cataloged as the 51451326-503 pH Probe Sensor, operates as a dedicated hardware component for continuous electrochemical hydrogen ion measurement within Honeywell analytical process loops. Configured with a 20 inch integrated cable assembly, it provides direct physical/electrical execution for in-line and immersion fluid sensing.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 51451326-503 |
| Brand | Honeywell |
| Origin | Industrial Standard Assembly |
| Weight | 1.31 lbs (0.59 kg) |
| Dimensions | Standard Industrial Analytical Probe Dimensions |
| Operating Temp | 0 to 100 deg C (32 to 212 deg F) |
| Power Consumption | Passive Electrochemical Sensor Element |
| Sensor Type | pH Glass Electrode Assembly |
| Cable Interface | 20 inch Integrated Cable Lead |
| Application Mounting | In-Line Threaded or Immersion Assembly |
Cold Junction Compensation & 4-20 mA HART Loop Telemetry
The 51451326-503 pH probe sensor generates millivolt signals proportional to solution activity, which are transmitted to analytical transmitters supporting cold junction compensation and RTD temperature offsets over its 20 inch cable connection. Galvanic channel-to-channel isolation within the downstream Honeywell interface module decouples low-impedance electrode signals from high-voltage field ground potential shifts. This signal conditioning retains measurement linearity across multi-parameter transmitter loops communicating via the 4-20 mA HART loop protocol.
Frequently Asked Questions
Q: Can the 51451326-503 probe be installed in pressurized in-line piping?
A: Yes, the electrode body housing is designed for direct insertion into process piping via standard in-line mounting hardware or immersion mounting assemblies within rated process pressure bounds.
Q: Does the integrated 20 inch cable require external junction shielding?
A: The high-impedance coaxial wiring within the 20 inch cable must be terminated directly into a compatible analyzer or field junction box without removing factory shielding to avoid signal noise corruption.
Field Installation Guidelines
- Remove the protective wet storage cap from the glass bulb sensing element immediately prior to installation.
- Install the probe into the threaded process fitting using Teflon tape or appropriate thread sealant, ensuring a liquid-tight mechanical seal.
- Keep the sensing element oriented at least 15 degrees above the horizontal plane to prevent air bubble accumulation inside the glass bulb.
- Route the 20 inch integrated cable through grounded, isolated electrical conduit to shield the high-impedance millivolt signal from nearby power lines.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Why Programmable Logic Controllers Drop into Stop Mode: An Expert Analysis
Industrial automation systems rely heavily on Programmable Logic Controllers (PLCs) to maintain uninterrupted production. When a PLC unexpectedly shifts from Run to Stop mode, whole manufacturing lines stall.
As control systems evolve across modern factory automation, understanding the root causes of these interruptions helps engineers minimize costly downtime. This technical guide breaks down why PLCs trip into Stop mode and provides practical strategies to mitigate system faults.
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.