Dwyer PM706 User Manual

BULLETIN E-90-706

Model PM706 Temperature Panel Meter

Specifications– Installation and Operating Instructions

DESCRIPTION

Model PM706 Digital Temperature Meter monitors and
displays temperature measurements using a Type K thermo­couple input. Meter features dual adjustable set points with 1A
relays and a selectable 4-20 mA or 0-10 VDC output signal.
View alarm settings by depressing the tactile alarm button on
the front panel. The bright red LED display has a floating deci­mal point and displays temperature in ˚F or ˚C. Meter is
equipped with overrange indication to alert operator of an
open thermocouple or faulty connections. Sealed front panel is
rated to NEMA 12 to protect against dust and fluids.

Installation and Connections

The panel requires a 1.73 x 3.62 (44 x 92mm) panel cut out
with minimum radius corners. Maximum panel thickness of
5/16 (4mm).

Remove the two retaining clamps by loosening and removing
their screws.

Feed the meter housing through the panel and re-fit the
clamps, holding them close to the meter housing as the
screws are tightened.

Tighten the screw sufficiently to retain the meter in the panel.
DO NOT OVER TIGHTEN THE SCREWS, otherwise the
threads in the case will strip.

Ensure the available input power is of the correct level, and is
fused at no more than 0.5A, filtered if on the same leg as heavy
switch gear, and is provided with an adequate clean ground.

Ensure any signal cabling is secured and kept clear of high

Figure 1: Wiring Connections

PHYSICAL DATA

Signal Input: Type K Thermocouple.
Signal Type: Single ended, negative wire connected to meter com-

mon.

Temperature Range: -148 to 1999˚F (-100 to 1200˚C).
Accuracy: ±2% at 23˚C ambient.
Resolution: 1˚F/˚C.
Read Rate: 2.5 readings/sec.

Setpoints/Alarms: One setpoint active below reading (internally

reconfigurable to above reading) and one setpoint active above
reading. Active condition indicated by LED indication.

Setpoint Adjustment: Set points adjustable by 20 turn poten­tiometers by removal of front cover. 0 to 2000 counts, adjustable
within 5 counts or better.
Setpoint Hysteresis: 3(0) counts max hysteresis built in to each
setpoint.
Setpoint Viewing: By depression of front panel accessible
switches. Indication agrees within ±5(0) counts of actual setpoint
level.
Analog Output: Factory configured non-isolated output 4-20mA,
8V maximum compliance or 0-10VDC 1kohm minimum load. Span
output set for 0-1000(0) counts, internally adjustable over 500(0) to
2000(0) count span. Accuracy ±1% ±(0.2mA or 0.2V) over operat­ing conditions. Adjustable range of output is -10% to 100% of F.S.

Relay Output: One normally open below duty contact output per
setpoint. 1A @ 250VAC/30VDC resistive load capacity.

Ambient Temperature Effect: +0.01% of rdg, -0.05˚ per degree.
Temperature Coefficient: ±100 ppm/˚C.
Sensor Wire Effect: 0.01˚C power ohm per conductor.
Broken Sensor: Display flashes overrange for open circuitry input.
Sensor Wire Current: 0.5µA.

Overrange Indication: Display flashes.
Operating Temperature Range: 32 to 122˚F (0 to 50˚C).

Storage Temperature Range: -4 to 185˚F (-20 to 85˚C).
Humidity Range: 0 to 80%, non-condensing.
Power Supply: 115/230 VAC, ±10%, 50/60 Hz.
Power Consumption: 7 W.

Common Mode: Signal common to power ground 1500V peak

DC to 60 Hz. 354V IEC spacing.

Housing: 8 DIN, NEMA 12.
Display: 7 segment red LED 14.2mm high. Decimal point posi-

tioning by internal solder switch. Negative polarity indication by
center segment of left hand display. Alarm indication by 3mm
round red LED displays.

Weight: 1 lb. (500 g).

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, ,U.S.A. Fax: [phone] e-mail: [e-mail]

Lit-By Fax: [phone]

current switching cables.

Note the relay outputs of the meter are light duty only and do
not incorporate snubber networks.

Check that the input supply is disconnected at source before
wiring up the meter.

Adjustments

Trimming span and zero and adjustment of alarm setpoints is
by means of potentiometers inside the front of the meter. See
figure 2. The front cover must be pried off to gain access to the
controls.

The span and zero adjustments on temperature meters should
not need to be changed from their factory settings, unless
significant sensor lead resistances are involved.

If the alarm setpoints are not required, they should be set to
beyond +2000(0) counts, and the low alarm configured to be
active above the setpoint.

Jumper Switches: Analog Output Signal

To change from standard 4-20mA output to 0-10V, three
jumper switches on the input board must be changed.
Location of the analog out jumpers is shown on figure 3.

Figure 3: Analog Out Jumpers

Jumper Switches: ˚F or ˚C

There is only one configuration switch; this is located at the
front end of the small signal input card. See figure 4.

Close the switch for ˚C and leave open for ˚F. Re-calibration will
be required if the jumper position is changed. Two known
temperatures will need to be monitored close to zero and
800˚C, either directly, or using a thermocouple/RTD simulator
and the zero and the span adjustments re-trimmed.

Figure 2: Front Card Features

Internal Jumper Switches

Access to the internal jumper switches requires the removal of
the unit from its case. These changes should be made, if
required, prior to the installation of the units.

Ensure the power is removed. Unplug all rear panel connectors
and unscrew the small retaining screw at the bottom rear of the
case. Pry off the front cover and carefully slide the printed
circuit board from the case.

Reverse the procedure after the changes are made, ensuring
the retaining screw is not over tightened.

Access to the analog output jumper switches requires the
removal of the input conditioner card, which can be pulled off
the main board. CAREFULLY PULL THE INPUT BOARD
STRAIGHT UP OFF THE BOARD. Carefully replace the card by
lining up pins in sockets and gently pushing towards main
board after configuration.

©Copyright 1999 Dwyer instruments, Inc Printed in U.S.A. 10/99 FR# R1-440679-00

Maintenance

After final installation of the Model PM-706 Temperature Panel
Meter, no routine maintenance is necessary. These panel
meters are not field serviceable and should be returned to the
factory, freight prepaid, if repair is needed. Be sure to include
a clear description of the problem plus any application infor­mation available.

Figure 4: Thermocouple Jumpers

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, ,U.S.A. Fax: [phone] e-mail: [e-mail]

Lit-By Fax: [phone]