Honeywell DL421/422 DirectLine® Sensor
The Honeywell DirectLine® architecture consists of an electronics module integral to the electrode. This design eliminates the need and added cost of a separate analyzer or transmitter.
The electronics module is sealed in a plastic weather proof, corrosion resistant housing and is connected to the pH/ORP electrode on one side and a 4-20 mA output cable on the other via water proof connectors. This housing design allows this system to be used in harsh environments where moisture and dust is a problem.
For submersion or special mounting applications, the remote mounting option connects the electronics module to the electrode via a cable. The electronics module is then mounted on a 2-inch pipe, wall, or DIN rail.
• Direct 4-20 mA output eliminates need for dedicated analyzers or transmitters, simplifying installation, start-up, operation, and maintenance tasks. Installation costs are also reduced because standard cable can be used for additional cable distances.
• Integral electronics with local HMI simplifies installation and shortens calibration times.
• Modular plug-in construction simplifies electrode replacements.
• Local display and keypad facilitates quick set-up, calibration, and operational activities.
• ½” NPT conduit connection provides increased protection and noise immunity of output cable
• Plug-in modular design allows sensor to be safely removed and replaced without cycling power on the electronics module.
• Electronics and sensor diagnostics reduces troubleshooting times.
• Sample or auto buffer calibration options accommodates individual calibration techniques and reduces calibration time.
• Playing card-sized guide facilitates simple, correct, and consistent calibration and configuration.
• Watertight sensor connection for reliability in submersion applications.
• Global approvals including:
– CE Mark for industrial applications
– UL General Purpose
– CSA General Purpose
– FM Class I, Div. 1 (I.S.)
– FM Class I, Div. 2 (non-incendive field wiring)
– IP66, Type 4x Enclosure
| Displayed Process Variable | pH: 0-14 pH ORP: –1600 to +1600 mV |
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| Displayed Temperature Range (pH only) |
–10 °C to +110 °C (14 °F to 230 °F) | |
| Display Accuracy (reference) | pH: ±0.02 pH ORP: ±1 mV |
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| Process Temperature | Durafet®: –10 °C to +110 °C (14 °F to 230 °F) Meredian®: 0 °C to 110 °C (32 °F to 230 °F) |
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| Durafet® Sensor Survivable Temperature Range |
–10 °C to +130 °C (14 °F to 266 °F) | |
| Electronics Module Ambient Temperature |
–20 °C to +85 °C (–4 °F to +185 °F) | |
| Output Type | 4-20 mA (2-wire loop powered) | |
| Output Scale | 0-14 pH, ±1600 mV | |
| Output Calibration | 4-20 mA | |
| Durafet® Remote Mating Connector Rating |
Submersible to 20 feet | |
| Output (Loop) Cable Connection |
M12 type | |
| User Termination | Tinned leads on cord set or customer supplied cable | |
| Cable Lengths | Sensor: | Durafet®: 20 feet or 50 feet Meredian®: 12 feet or 20 feet |
| Output: | 20 feet or 50 feet | |
| Power | 16-42 Vdc Maximum Load Resistance: 250 ohms at 16 Vdc 600 ohms at 24 Vdc 1400 ohms at 42 Vdc |
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| Local Display and Buttons | LCD 4-digit, 7-segment | |
| Engineering Units | pH, mV degrees F degrees C |
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| Calibration Options (pH) | 1 point Sample or 2 point Sample Auto Buffer Recognition Selections: US, NIST, EURO |
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| Solution Temperature Compensation (for pH only) |
Selections: 0.00pH/10 °C –0.16pH/10 °C –0.32pH/10 °C |
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| Diagnostics | Sensor and electronics | |
| Case | Weatherproof, corrosion-resistant plastic housing | |
| Approvals | CE Mark for Industrial Applications UL – General Purpose CSA – General Purpose FM Class I, Div. 1, Groups A, B, C, D and Class I, Zone 0, AEx ia IIC (I.S.) FM Class I, Div. 2, Groups A, B, C, D; Class I, Zone 2, Groups IIC (non-incendive field wiring) Enclosure: IP66, Type 4x |
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| Remote Mounting | Pipe, Wall, or DIN Rail | |
| Dimensions | H 123 mm (4.84") x W 48 mm (1.89") x D 46 mm (1.81") | |
| Weight | Approximately 142 g (5.0 oz.) | |
