HONEYWELL SP3000 (01) PDF MANUAL

The SP3000 Temperature Sensors are for use with electronic controllers where linear PTC sensors are required (T7075, Series 1000, W7100, W7600, W7620, R7380J,L) in immersion or strap-mounted discharge applications.

Requires no settings or calibration.

Platinum positive temperature coefficient (PTC) sensing element.

Resistance range is 2900 to 4400 ohms.

Suitable for mounting in immersion well.

Can be strapmounted to discharge pipe of boiler or chiller.

30 Vac maximum.

The resistance of the SP3000 sensor varies with temperature as follows:

Temperature °C	-10	0	10	20	30	40
Temperature °F	14	32	50	68	86	104
Resistance in ohms—SP3000	3,178	3,266	3,353	3,440	3,527	3,613

+/-2° F [1.1° C].

For SP3000-2 and SP3000-15: -40 to +302° F (-40 to +150° C)

For SP3000-WR: -40 to +248° F (-40 to +120° C)

As specified in Table A:

ITEM NUMBER	LEAD LENGTH INCHES (MM)
SP3000-2	24 (610)
SP3000-15	180 (4572)

When installing this product:

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

CAUTION: Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.

The SP3000 Encapsulated Temperature Sensor can be installed by strapping the sensor to the outside of a boiler or chiller output pipe, or by placing the sensor in the fluid of a boiler or chiller using an immersion well.

Follow these steps for strap-on mounting:

The sensor bulb should be located at a point on the discharge pipe approximately 3 ft [1 m] from the boiler or chiller.

1. Remove any insulation on the pipe, leaving about 6 in. [15 cm] of the pipe exposed. With care, most insulating materials may be able to be reused to cover the sensor when the installation is complete.

2. Clean the pipe surface for good sensor-to-pipe contact. Apply heat conductive compound to the pipe at the selected location.

3. Press the sensor bulb into the heat conductive compound and fasten to the discharge pipe with 105900 Pipe Clamp, duct hanger wire or with metal hose clamps.

Note: External mounting produces a slight offset (up to 5° F [2.8° C]) in control temperature. Use heat conductive compound and apply insulation around the sensor and pipe to decrease this offset.

IMPORTANT: Erratic temperature readings from a sensor can be caused by the wiring practices described below. These must be avoided to assure proper operation. Use shielded cable to reduce interference if rerouting of sensor wiring is not possible.

1. Do not route temperature sensor wiring with building power wiring, next to control contactors or near light dimming circuits, electric motors or welding equipment.

2. Avoid poor wiring connections.

3. Avoid intermittent or missing building earth ground. Do not mount sensor in incorrect environment.

Resistance in the SP3000 Sensor wiring positively offsets the temperature sensed by 1 degree F for every 4.8 ohms [8.6 ohms/°C] of resistance. Use larger gauge wire when longer lengths are necessary.

The SP3000 sensor has a positive temperature coefficient (PTC), meaning its resistance increases as temperature increases. The resistance ranges from approximately 3200 ohms near 20°F (-7°C) to over 4200 ohms near 220°F (104°C). A typical value is 3484 ± 6.5 ohms at 77°F (25°C). Refer to the temperature/resistance curve (Fig. 3 in the PDF) for specific values across the operating range.