SPN1-MS1 – Instructions v1.6
6/11/06
Delta-T Devices Instruction Sheet
Sunshine Pyranometer
type SPN1-MS1
SPN1-MS1 Instructions
Introduction
The SPN1-MS1 is a special development for MeteoSwiss
of the standard SPN1 Sunshine Pyranometer with the
following features:
•
Fits the MeteoSwiss heating and ventilating dome.
•
Lemo connectors are provided for the data logger and
serial connections.
•
Custom firmware provides a sunshine duration
threshold of 200 W.m
-2
in the direct beam.
Check Packing List
The SPN1-MS1 is supplied with a 5-pin and an 8-pin Lemo connector, and a calibration certificate.
Mounting and Connections
Use the three M5 tapped holes in the base to mount the SPN1 inside the MeteoSwiss heating and
ventilating dome. Do not touch any socket cap screws under the flange holding the dome. These are
sealed during manufacture. Mount the dome horizontally – no polar alignment or routine adjustment
needed. Connect the power, data logger, and serial port if required, using the connection details below.
Data Logger
Connection
using 8-pole Lemo plug
Pin
Function
Notes
1
Total
Total output: 1mV = 1W.m
-2
2
Diffuse
Diffuse output: 1mV = 1W.m
-2
3
Sig Gnd
Signal ground
(connected internally to Power 0V)
4
Sun
Contact closure on Sunshine
5 Power
0V
6 Power
V+
Power for SPN1-MS1 electronics,
5 - 15V DC, 2mA **
7 Htr
-
8 Htr
+
Power for internal SPN1-MS1
heater, 12V DC, 1.5A max **
Shell
Screen
Connects to SPN1-MS1 case *
Pin 1 (Total output) and pin 2 (Diffuse output):
connect to data logger voltage inputs.
The normal range of this output is 0V – 1.5V
Pin 3: connect to data logger signal ground or –ve
input terminal.
Pin 4: connect to a data logger digital input. It gives a
short circuit to ground when sunshine is present, and
open circuit with no sunshine. Alternatively, connect
to a resistance input, with a precision resistor in
parallel.
Pins 5 and 6 (SPN1-MS1 power): apply >5V to power
the SPN1 and enable the sensor output signals.
Pins 7 and 8 (internal heater power): connect to a
12V DC 1.5A power supply. The actual heater current
depends on the temperature. This internal heater may
not be needed if using the MeteoSwiss heating and
ventilating dome
Serial Port
Connection
using 5-pole Lemo plug
Pin
Function
Notes
1 GND
Ground
2
CTS
Power for SPN1-MS1 electronics.
Connect to RTS of PC serial port **
3
Rx
Received data into SPN1-MS1
4
-
(not implemented)
5
Tx
Transmitted data from SPN1-MS1
Shell
Screen
Connects to SPN1-MS1 case *
* Note: Use screened cable. Clamp braid to connector
shells and terminate at datalogger or PC case or ground. To
avoid ground loops do not interconnect braids elsewhere.
** Note: the SPN1-MS1 draws power from Power V+, CTS,
or Htr +, whichever provides the highest voltage.
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