1PC Barksdale TS2000 0628-017 Without Outer Packaging zf

Barksdale · Temperature Switch · TS2000 Series · Mechanical · In stock

What Is the Barksdale TS2000 0628-017 Temperature Switch?

The Barksdale TS2000 0628-017 is a mechanical temperature switch — a self-contained device that opens or closes an electrical contact at a predetermined temperature setpoint, without needing external power, a PLC, or a digital controller. Barksdale is a well-known German-American manufacturer of industrial pressure and temperature switches used in hydraulic power units, pneumatic systems, machine tool coolant circuits, compressor packages, and industrial process equipment. The TS2000 series uses a temperature-sensing bulb and capillary tube filled with a fluid that expands with temperature, mechanically actuating a snap-action microswitch at the setpoint.

In short: A mechanical thermostat switch that trips at a specific temperature — the kind you wire into a cooling fan circuit, an over-temperature alarm, or a compressor shutdown loop, where it operates autonomously without any programming or external power.

Understanding Mechanical Temperature Switches

1. How the Bulb-and-Capillary Sensing Works

A metal bulb (the sensing element) is installed in the medium being monitored — immersed in a hydraulic oil reservoir, clamped to a pipe surface, or inserted into a tank wall thermowell. The bulb connects via a thin capillary tube to a bellows or diaphragm inside the switch housing. As temperature rises, the fluid inside expands, pressurizing the bellows, which pushes against a spring-loaded mechanism. When the force overcomes the spring tension (the setpoint), the mechanism snaps a set of electrical contacts open or closed. This entire sequence is purely mechanical — no circuit board, no firmware, nothing to configure except the setpoint adjustment screw.

2. Setpoint Adjustment and Deadband

Most TS2000 models have an adjustment screw or knob that shifts the spring preload, changing the trip temperature. The deadband (also called hysteresis or differential) is the temperature difference between the switch tripping ON and resetting OFF. For example, a switch might close at 80 degrees C (turning a fan on) and re-open at 70 degrees C (turning the fan off). This 10-degree deadband prevents rapid cycling. Some TS2000 variants have a fixed deadband; others have an adjustable deadband. Check the model-specific datasheet for your unit's deadband specification.

3. Contact Configuration: NO, NC, or SPDT

The 0628-017 suffix defines the specific configuration of this switch — temperature range, contact type (normally-open, normally-closed, or changeover/SPDT), and capillary length. A normally-open (NO) contact closes on rising temperature — ideal for turning a fan on when things get hot. A normally-closed (NC) contact opens on rising temperature — ideal for a high-temperature shutdown circuit that kills power to a heater or compressor when it overheats. An SPDT contact gives you both, letting you wire one side for alarm and the other for control. Verify the contact configuration from the product marking or consult the Barksdale catalog with the full 0628-017 designation.

Key Specifications

Frequently Asked Questions

How do I determine the exact temperature setpoint range from the 0628-017 code?

The numeric code 0628-017 is Barksdale's ordering code that encodes the temperature range, contact type, capillary length, bulb dimensions, and other options. The full specifications can be decoded using a Barksdale TS2000 series catalog or datasheet. If you do not have access to one, the temperature range is often also printed on the switch's nameplate or on the adjustment dial/scale. If the switch body has no range marking, the capillary tube length and bulb dimensions can give clues — shorter capillaries with small bulbs are typically for lower-temperature ranges. Contact us and we can help decode your specific unit.

How do I test this switch to confirm it trips at the correct temperature?

Immerse the sensing bulb in a temperature-controlled bath (water for ranges below 100 degrees C, oil for higher ranges) with a calibrated reference thermometer. Connect a multimeter in continuity mode across the switch contacts. Slowly raise the bath temperature while watching the thermometer and multimeter. Note the temperature where the contacts change state (make or break). Then slowly cool the bath and note the temperature where the contacts return to their original state. The difference between these two temperatures is the deadband. Compare these values against the switch's specified range — if the trip temperature is significantly off (more than a few degrees), adjust the setpoint screw if the model allows it.

Can I shorten or extend the capillary tube?

No — the capillary tube length is integral to the switch's calibration. The tube contains a precise fill volume of the sensing fluid. Cutting the tube releases the fluid and destroys the switch. Extending it would change the fill volume and shift the calibration. The capillary can be coiled (minimum bend radius typically 25-50mm — check the datasheet) to take up excess length, but it must not be kinked, crushed, or nicked. A kinked capillary restricts fluid movement and causes inaccurate or sluggish switching. Route the capillary away from sharp edges, moving parts, and high-vibration surfaces.

Does this switch need to be mounted in a specific orientation?

Most Barksdale TS2000 switches are position-insensitive — they can be mounted in any orientation without affecting the trip point. However, the sensing bulb should be fully immersed in the medium for accurate temperature measurement. If the bulb is only partially immersed, it will sense a temperature somewhere between the medium and the ambient air around the exposed portion. For pipe surface mounting, use a thermally conductive paste between the bulb and the pipe, and insulate over the bulb to minimize ambient air influence. Secure the bulb firmly — a loose bulb vibrates and may fatigue the capillary connection.

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