SATO KEIRYOKI SK-M350-TRH User manual

Instruction Manual
Temperature/Humidity Indicator
Model SK-M350-TRH
No. 3 Nishi-Fukudacho, Kanda, Chiyodaku, Tokyo 101-0037 Japan
URL: http://www.sksato.co.jp/english/

1
Introduction
Thank you for purchasing the Temperature/Humidity Indicator model SK-M350-TRH.
- This is an indicator which displays the temperature and humidity by inputting an analog voltage
(0 to 1 DVC). SK-M350-TRH can be connected to a direct voltage output device or our
temperature/humidity transmitter model SK-RHC-V (0 to 1 DVC). Do not use this instrument for any
other purposes.
* Voltage output device and temperature/humidity transmitter model SK-RHC-V (0 to 1 DVC) are
sold separately.
- Read this instruction manual thoroughly before use and keep it in a safe place for future references.
Warning DANGER
RISK OF EXPLOSION
- This instrument is not explosion-proof. Never use it in environment with flammable gases.
- For any inquiries, contact the store where you bought the instrument or our service network.
Cautions
■Follow the instructions below for proper usage of the product.
- Never disassemble or modify the instrument. Doing so may cause malfunctions.
- These are precision instruments. Be careful not to drop, vibrate or give an impact to them
- Avoid using the instruments in a place exposed to direct sunlight or near a heat source.
Doing so may not just compromise the measurements but cause failures as well.
- Avoid using the instrument in dusty environment or salty air. Dust and dirt on the power plug may
cause fire.
- This instrument is not waterproof. Never let it wet.
- Do not use it in places in effects with condensing, rain, water drops or steam.
- If this instrument is used in an environment where electrical noise is generated, the display may
become unstable and the measurement error may increase.
- Refer to the 'Installation Method' section of this manual when installing the instrument and be
careful not to drop.
- Remove all electrical wirings before moving the instrument. Fail to do so may cause dropping of the
instrument.
- Make sure to select a proper type of adaptor in accordance with related standards and product
specifications when not using the accessory device that comes with the instrument.
The standards and specifications are stated in the 'AC adaptor' section of this manual.
■Follow the instructions below to avoid electric shocks.
- No power switch is available for this instrument. Therefore when connected to a power source
the instrument enters into the operation state soon.
- Connect to a power source only after correct wiring is complete.
- Do not touch the terminals while power is being supplied.
- Do not wire the instrument in places with heavy humidity or water splash nor with wet hands.
- Make sure to put the terminal cover on during usage time in prevent from dust or an electric shock.
■Contact the distributor where the purchase was made or our service network for any repair or
calibration of the instrument.

2
Overview
This instrument is an indicator which displays the temperature and humidity by inputting an analog
voltage (0 to 1V). This instrument can be connected to a direct voltage output device or our
temperature/humidity transmitter, model SK-RHC-V (0 to 1V).
Features
- Easy to read LED display with the character height of approx. 57mm
Incorporating the red LED with its character height of approx. 57mm makes the displayed values
well visible from far distance.
- Free angle fixture stand
This enables for the user to set the display at any desired angle.
- Easy to wire since the power supply for temperature/humidity transmitter is equipped.
- Alarm function for upper and lower limits are available for option at the time of purchase order.
A buzzer or a rotating warning light can be attached as an alarm device.

3
Names of components
(1) Display (red LED) : character height approx. 57mm
(2) Input terminal board
(3) DC jack : AC adaptor connection port
(4) Fixture stand : Plate thickness t=3.2mm, 4 holes for fixture
(5) Knob screw
(6) Cover
(7) Cable passage
(8) AC adaptor outlet
(9) Cover fixture screw : (6 holes)
(10) Alarm setting : optional
Front view
Side view
Bottom view
Rear view (with cover)
Rear view (without cover)
Standard instrument
Instrument with alarm (optional)

4
Wiring method
Cautions
- Connect to a power source only after completing the wiring.
- Please be careful not to confuse the wiring. Incorrect wiring may result in instrument failure.
- Do not wire the instrument in places with heavy humidity or water splash nor with wet hands.
- When wiring the terminal block, tighten the screws securely without a slack.
- Do not use unconnected terminals for other application such as transmission.
- In using crimp terminals, take the necessary insulation distance by an insulation tube or the kind to
avoid exposure of wires so that a electric shock or short circuit may be prevented.
- Please use the input load within the standard specifications.
- Refer to the 'Installation Method' section of this manual when installing the instrument and be careful
not to drop.
- Remove all electrical wirings before moving the instrument. Fail to do so may cause dropping of the
instrument.
- Make sure to put the terminal cover on during usage time in prevent from dust or a electric shock.
- Please use the cable with proper diameter.
- It is recommended to use a crimp terminal for wiring. Please tighten the wires securely without a slack.
- A direct voltage output device or our temperature/humidity transmitter, model SK-RHC-V, is not
included as a part of the instrument.
- When each input device such as SK-RHC-V transmitter is connected with the indicator, error may
occur if the cable length is longer because of the noise or voltage depression. Please check
thoroughly environmental conditions such as the electrical noise before wiring.
- Do not touch the electrical board and electronic components in the device.
1. Applicable cable
Diameter of applicable cable : 0.75sp (AWG18) to 0.34sq (AWG22)
Size of terminal screw : M3
Installation torque : 0.5N/m
* Tighten the screws with a screwdriver bit and torque that matches the screw size.

5
2. Wiring method
(1) Loosen the six screws at the rear side of the instrument and remove the cover.
* Do not loosen or re-tighten the screws other than those six screws.
(2) Insert the cable through from the outside of the cable wiring port on the cover and wire to
the terminal block as shown in the drawing below.
* Cut an opening to the film covering the cable
wire port with a cutting knife.
* Please note the direction of the cover
○ Wiring diagram
<with the cover>
<without the cover>
Cover fixture screws (size: M3)
Cover fixture screws (size: M3)
terminal block
○ Terminal description
Terminal
Description
T+
Temperature input + Terminal
GND
Connect –(minus) terminal of DC
output device
H+
Humidity input + Terminal
DC12V
Power output + Terminal (*)
When use this as a power supply, the
rating is 12VDC/0.7A or less.
DC GND
Power output –Terminal (*)
* Use these to connect SK-RHC-V transmitter
Both ends are for terminal block fixture screws.
Do not loosen the screws.
TEMP.
OUTPUT
+
OUTPUT
-
HUMI.
OUTPUT
+
POWER
12VDC
POWER
GND
TEMP.
INPUT
HUMI.
INPUT
POWER
OUTPUT
DC output device

6
○ Connecting with a Temperature/Humidity transmitter, model SK-RHC-V (0 to 1V)
Check the wiring diagram of the terminal block and wire correctly.
Terminal
Description
T+
Temperature input + Terminal
GND
Connect Temperature input –Terminal (T-) and Humidity input –Terminal (H-)
H+
Humidity input + Terminal
DC12V
SK-RHC-V (0 to 1V) 12 to 24VDC power +
DC GND
SK-RHC-V (0 to 1V) 12 to 24VDC power –(GND)
(3) Fix the cover to the instrument with screws.
* Please use the M3 screws that comes with the instrument for fixture.
* Make sure there is no wobble of the cover.
Installation method
Cautions
- Be careful not to let the instrument fall when using in desktop.
- Use screws such as concrete screws in 4 holes on the fixture stand for secure fixture.
- Concrete screws are not supplied with the instrument.
- The weight of the instrument is approximately 3.8 kg. When installing, make sure to select appropriate
screws after checking installation conditions such as strength.
Both ends are for terminal block fixture screws. Do not loosen the screws.
TEMP.
INPUT
HUMI.
INPUT
POWER
OUTPUT

7
1. Installation location
Do not install the instrument on a rooftop. Avoid following locations for installation:
- Places with flammable gas, explosive gas and corrosive gas such as SO2and H2S
- Places where the ambient temperature go beyond 0 to 50℃(humidity of less than 85%rh)
- Places of the impact of electrical noise and radio waves
- Places in effects with condensing, rain, water drops or steam
2. Installation method
(1) Fix the fixture stand securely to a desired installation location.
* Be careful not to let the instrument fall when using in desktop.
* Use screws such as concrete screws in 4 holes on the fixture stand for secure fixture.
○ An example of installation
○ Dimensions of the fixture stand (bottom view)
* Plate thickness t=3.2mm
Bottom view of the fixture stand

8
(2)Loosen the knob screws at both sides of the fixture stand and adjust the indicator in any direction
desired. After adjustment, tighten the knob screws while maintaining the angle. The indicator is fixed
to the angle.
swing fixing
* Turning the knob screws may remove the knob screws. In such case, be careful not to let the indicator
to fall as it is free from its fixture stand. Such fall may result instrument failure from impact. Make sure
to take enough precautions.
How to Use
Cautions
- No power switch is available for this instrument. Therefore the instrument becomes its operation state
when connected to a power source.
- Connect to a power source only after completing the wiring.
- Please be careful not to confuse the wiring. Incorrect wiring may result in instrument failure.
- Do not touch the terminals while power is being supplied.
- Please use the input load within the standard specifications.
- Remove all electrical wirings before moving the instrument. Fail to do so may cause dropping of the
instrument.
- Make sure to select a proper type of AC adaptor in accordance with related standards and product
specifications when not using the accessory device that comes with the instrument.
- Make sure to put the terminal cover on during usage time in prevent from dust or an electric shock.
- Input a direct voltage to T+/H+ within the rating range as below. Using the instrument outside of its
range may cause instrument failure.
Rating: temperature: 100 to 600mV, Humidity: 50 to 999mV

9
1. AC adaptor
Please select an adaptor which meets following specifications when using another adaptor that was not
included in the instrument.
<Primary output> Voltage : 12VDC
Electrical Current : 1A
Polarity :
Plug diameter : Outer diameter ø5.5mm, inner diameter ø2.1mm, length 9.5mm
2. How to use
(1)Check for the correct wiring and secure fixture of the instrument.
Refer to the 'Wiring method' and 'Installation method' sections of this manual for proper wiring and
secure installation.
(2)Insert the AC adaptor plug into DC jack
from the AC adaptor outlet.
The LED on the display will light up and the
instrument is in operation.
(3)In order to finish the operation, pull out the AC adaptor from DC jack. The display will turn off and the
operation is ended.
Error Messages
Error codes are displayed on the display section.
Error message
Causes
Er 0
These codes display if abnormal signals (noise) are input when power is applied to
the unit.
→Unplug the power source and then plug it again
If the "Er 0" display persists, the unit is likely to be faulty. Contact the shop you
purchased the unit or our service networks.
Er 1
These codes display if abnormal signals (noise) are input while the unit is running.
→Unplug the power source and then plug it again
If the "Er 1" display persists, the unit is likely to be faulty. Contact the shop you
purchased the unit or our service networks.
Maintenance
● Storage
Store the instrument within the operation ambient: 0 to 50°C and less than 85%rh (no condensing)
● Cleaning
- Do not wash or wipe this unit with alcohol, thinner, or other solvents. Use soft cloth to clean. In case
of tough stain, wipe it with a cloth that that has been soaked in water with a neutral detergent and
tightly wrung.

10
Specifications
Product name
Temperature/Humidity indicator
Model
SK-M350-TRH
Cat. No.
No. 8091-50
Display range
Temperature : -15.0 to 65.0°C
Humidity : 5.0 to 99.9%rh
Resolution
Temperature : 0.1°C
Humidity : 0.1%rh
Accuracy
Temperature : ± (0.3°C + 1 digit)
Humidity : ± (0.3%rh + 1 digit)
Display sampling speed
Approx. 1 second
Display
7-segment red LED, character height: approx. 57mm
Usage ambient
0 to 50°C, less than 85%rh (no condensing)
Input connection
Terminal block
Input
Temperature : 150 to 650mVDC (-15.0 to 65.0°C)
Humidity : 50 to 999mVDC (5.0 to 99.9%rh)
Power requirement
AC adaptor 12V/1.0A (included)
Power consumption
Approx. 3W
Materials
Main unit (indicator): SCPP
Panel:Acrylic resin
Dimensions
Approx. (W)360 x (H)202 x (D)85mm (excluding projected part)
Weight
Approx. 3.7kg
Accessories
Instruction manual, AC adaptor (in use of 100 to 240VAC)
* Design and specification are subject to change without notice due to product improvement.
No. 3 Nishi-Fukudacho, Kanda, Chiyodaku, Tokyo 101-0037 Japan
URL: http://www.sksato.co.jp/english/

11
Instruction Manual for
Connecting Cable between SK-RHC-V Transmitter and Digital Indicators
This cable is used to connect our temperature/humidity transmitter model SK-RHC-V (0 to 1 DVC)
and our digital temperature/humidity Indicators. Do not use this cable for any other purposes.
As for the usage of the transmitter and digital Indicator, read each instruction manual
1. Applicable cable
. Outer diameter : 10mm, 4 conductors (common wiring: T-, H- 12VDC, GND)
. Terminal treatment : wires (Transmitter) / O terminals (Indicator),
2. How to wire
Check the wiring diagram of the terminal block and wire correctly.
When the cable length is 10m or longer, do not wire the cable to the “DC12V” terminal and be
sure to use the direct power supply (12 to 24VDC or AC adapter). Otherwise, potential
difference generates by the extended cable and the indicating errors may occur.
○ Connecting with a SK-M350TRH ○ Connecting with a SK-M460TRH
Temp./Humi. Transmitter
Temp./Humi.
Indicator
Cable
T+
T+
white (O terminal: red)
H+
H+
blue (O terminal: blue)
12 to 24VDC power +
DC12V
yellow (O terminal: red)
12 to 24VDC power -
GND
black (O terminal: blue)
TEMP.
INPUT
HUMI.
INPUT
POWER
OUTPUT
POWER
OUTPUT
TEMP.
INPUT
HUMI.
INPUT
GND
12VDC