Cumberland Sp-module User manual

SP-MODULE

Static Pressure Module

USER'S MANUAL

M 890-00102 rev. 04

REV. 00

2SP-MODULE rev.04

TABLE OF CONTENTS

PRECAUTIONS ....................................................................... 3

INSTALLATION ...................................................................... 4

Description of the SP-MODULE ............................................... 4

Installing the Module on the Wall ............................................. 4

Connecting the Sensor .......................................................... 7

Connecting the Output Wire ................................................... 8

USING THE SENSOR ................................................................ 9

Description of the SP-MODULE ............................................... 9

TECHNICAL SPECIFICATIONS ................................................ 10

WIRING DIAGRAMS ............................................................. 11

SP-MODULE rev.04

PRECAUTIONS

The room temperature where the module is located MUST ALWAYS

REMAIN BETWEEN 32°F AND 104°F (0°C TO 40°C).

To avoid exposing the module to harmful gases or excessive humid-

ity, it is preferable to install it in a corridor.

DO NOT SPRAY WATER ON THE MODULE

FOR CUSTOMER USE

Enter the serial number located on

the side of the module below for

future reference.

Model number:

Serial number:

SP-MODULE

4SP-MODULE rev.04

DESCRIPTION OF THE SP-MODULE

The SP-MODULE is capable of measuring low pressures with a ±1%

accuracy - ideally suited for proper building pressurization and air

flow control. Transmitters can withstand up to 10 psig overpressure

with no damage to the unit. Variable capacitance sensor design

provides excellent sensitivity and long-term stability.

INSTALLING THE MODULE ON THE WALL

One module should be mounted on a wall indoors at each point

where the low voltage cable enters and exits a building, preferably in

a location where humidity and dirt levels are not too high. Isolate the

module from vibrations because the axis prependicular to the mount-

ing base is sensitive to vibrations. In most cases, preferred installa-

tion is with the baseplate mounted vertically and located on a

relatively flat surface in a junction box or attached to a nearby

beam.

The axis most sensitive to vibration is the one perpendicu-

lar tothe mounting base. Avoid mounting with maximum

vibration along this axis.

Pressure Fitting: Both the positive (high) pressure port and the

reference (low) pressure port are located on the top face of the unit,

labeled High and Low respectively. For best results (shortest re-

sponse times), 3/16" I.D. tubing is suggested for tubing lengths up to

100 feet long, 1/4" I.D. for tubing lengths up to 300 feet, and 3/8"

I.D. for tubing lengths up to 900 feet.

Open the module cover by removing the top cover screws (see Fig.1,

Item A). There are 2 mounting holes (Fig. 1, Item B). These holes

accept M4 or M5 screws. Figure 2 gives the mounting hole pattern.

INSTALLATION

WARNING

SP-MODULE rev.04

SP-MODULE

Do NOT install or use a damaged module. Contact your

distributor to obtain another unit.

Take a few moments to write the complete serial number

found on the side of the module on page 1 of this manual. This

will be useful for future reference.

Fig. 1 Exploded view of the SP-MODULE

WARNING

3.75 in

(95 mm)

3 in

(76 mm)

4.8 in

(122 mm)

12 SP-MODULE rev.04

WIRING DIAGRAMS

COM OUT

LOW

HIGH

EXC

RECIVER LOAD

MAIN

CONTROLLER

RECEIVER LOAD

SP-MODULE

SP-MODULE rev.04

ATTIC

AIR INLET:

“REFERENCE” AIR OUTLET:

“ROOM”

LOOP TO TRAP HUMIDITY LOOP TO TRAP

HUMIDITY

1/4” (0.6cm)

DIAMETER TUBE

1/4” (0.6cm)

DIAMETER TUBE

40"

(100cm)

PLASTIC

INSECT FILTER

PLASTIC

INSECT FILTER

Pressure Fitting

3/16"I.D for tubing lengths up to 100 feet long

1/4" I.D. for tubing lengths up to 300 feet

3/8" I.D. for tubing lengths up to 900 feet

Fig. 3 Installation of the SP-MODULE

Always make loops in the inlet and outlet tubes. If this is not

done, humidity may permanently damage the sensor.

WARNING

Fig. 2 Mounting hole pattern

Figure 3 shows how to install the SP-MODULE. The end of the outlet

tube must be placed in the ventilated room with the plastic filter pro-

vided. This filter prevents insects from entering the tube.

The end of the inlet tube must be installed with the plastic filter away

from drafts.The attic can generally be used as a reference. To deter-

mine if the attic is an adequate reference, read the pressure difference

between the attic and outside. It should be close to zero.

Make a loop in both tubes (room and reference) to trap humidity (Fig. 3).

SP-MODULE rev.04

TECHNICAL SPECIFICATIONS

Type SP-MODULE

Accuracy: ±1% of full scale (RSS) (includes non-

linearity, hysteresis, and non-repeatability

Nominal operating voltage: 14-28 VDC, 13-24 VAC 50/60 Hz

Operating current: 20 to 50 mA

Output 4 TO 20mA, 2-wire

Maximum pressure: 10 psig (0.7kg/cm2)

Loop Resistance: 0-800 ohms

Supply Voltage: 12-30 VDC

Zero and Span Adjust: ±1mA, non-interactive

Compensated Temperature

Range: 0 to 150°F (-18 to 65°C)

Thermal Effects: 0.033% FS/°F (0.018% FS/°C)

Housing: IP54, plastic casing

Weight: 0.35 kg (unpacked)

Dimensions (LxWxH): 114 x 114 x 85 mm

Operating temperature: 0 to 150°F (-18 TO 65°C)

Storage temperature: -40to 185°F (-40 to 85°C)

Pressure Connection: 3/16" O.D. fitting for 1/4"I.D tubing

Minimum Supply Voltage: 12+0.02x(resistance of receiver plus line)

Maximum Supply Voltage: 30+0.004x(resistance of receiver plus line)

The unit is calibrated at the factory using a 250 ohm load at 28VDC

SP-MODULE rev.04

SP-MODULE

Connecting the Sensor

To connect the sensor, refer to the wiring diagram. Make sure the

power supply is suitable for the sensor (see technical specifications at

the end of this manual).

WARNING. All wiring must be done by an authorized elec-

trician according to all applicable codes, laws and regula-

tions. Make sure that the power is off before doing any

wiring or opening the sensor to avoid electrical shocks and

equipment damage.

Pass all wiring through the bottom of the enclosure. Do

not drill holes on the side or the top of the enclosure as this

may allow water to enter the enclosure.

To punch holes through the bottom, use a hammer and punch to carefully

punch the holes you need.

Never mount the sensor near water or rain pipes, as failure

of these pipes may cause strong water jets to reach the

sensor.

Do not under any circumstances change the setting of the

calibration potentiomenter inside the enclosure. This will

decalibrate the pressure gauge.

Do not install ends of inlet (reference) and outlet (room)

tubes in walls, in insulation, in a humid environment or near

walls affected by drafts.

WARNING

SP-MODULE

SP-MODULE rev.04

Span Adjustment (Complete the zero adjustment before setting span):

Span on full scale output adjustments should only be performed by using

an accurate pressure standard (electronic manometer, digital pressure

gage, etc.) with at least comparable accuracy to the SP-Module (668

Series) (<±1% full scale). With full scale pressure applied to the high

pressure port (reference port open to atmosphere) adjust span to achieve

20 mA output.

Example 1 : Unidirectional pressure range of 0 to 1"W.C. Apply

1.00"W.C., adjust span to 20 mA.

Notes: The input is reverse-voltage protected. The output is internally

protected against damage if shorted to ground. Recheck all

connections before applying power.

SP-MODULE

SP-MODULE rev.04

Connecting the Output Wire

The sensor must be connected to the main controller according to the

wiring diagram. The cable may be a 3-core low voltage shielded cable

and may be extended up to 1000ft (300 meters) (if the wire diameter is

at least 18 AWG ( .64 mm)). The recommended wire diameter for

extending sensor cables is 1.0mm.

- When extending an output wire, solder all connections.

- Never run low voltage cables parallel to high voltage wires

to prevent interference.

- Output cables must cross power cables at a 90° angle.

ALWAYS switch power to the sensor OFF before opening

the sensor.

SP-MODULE rev.04

USING THE SENSOR

Description of the SP-MODULE

The SP-MODULE has one output:

- 4-20mA signal

Output

current

Pressure

Difference

20mA

4mA

Fig. 4 Output current vs pressure difference

Calibration: The SP-Module (668 Series) is factory calibrated and should

require no field adjustment. However, both zero and span adjustments

are provided. Whenever possible, any zero and/or span offsets should be

corrected by software adjustment in the user's control system. Use the

zero and span adjustments on the SP-Module (668 Series) only if abso-

lutely necessary. The SP-Module (668 Series) is calibrated in the vertical,

position the unit and follow the zero adjustement procedure listed below.

Pressure ranges are fixed and cannot be changed in the field.

Zero Adjustment: While monitoring the current output with both pressure

ports open to atmosphere, the zero may be adjusted. For unidirectional

pressure ranges, turn the zero adjustment screw until a reading of

4mA (±0.15 mA) is achieved.